Programming of Java-II practical slips solution |CS-369

In these posts, we can see the programming of Java 2 practical slips solution PDF, java plays a critical role in managing the development part of the software field of an industry. In this blog, we will explore solutions set of the practical slips provided for the CS-369 course on Java 2 for Tybsc computer science students. These slips focus on hands-on exercises that help students deepen their understanding of threads, collections, connectivity, JDBC connections,s and more. Whether preparing for lab exams or revising key concepts, these solutions will guide you step by step through each problem, providing practical insights to enhance your learning experience.

Write a Java program using Multithreading to display all the alphabets between ‘A’ to

‘Z’ after every 2 seconds.

package com.mycompany.javaslip;

import java.util.logging.*;

public class slip1_1

{

public static void main(String[] args)

{

Thread t = new Thread(() ->

{

while(true)

{

for(char ch = 'A'; ch <= 'Z'; ch++)

System.out.print(ch + " ");

System.out.println();

try

{

Thread.sleep(2000);

}

catch (InterruptedException ex)

{

Logger.getLogger(slip1_1.class.getName()).log(Level.SEVERE, null, ex);

}

System.out.println("2 seconds are passed....");

}

});

t.start();

}

Slip no 2 Write a Java program to accept the details of Employee (Eno, EName, Designation,Salary) from a user and store it into the database. (Use Swing)

package com.mycompany.prac1;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.io.IOException;

import java.sql.*;

import java.util.logging.*;

import javax.swing.*;

class EmpApp {

private JFrame frame;

private JTextField eno, ename, desig, sal;

private JButton clear, insert;

EmpApp() throws SQLException {

frame = new JFrame("Employee App");

frame.setSize(400, 200);

frame.setLayout(new GridLayout(5,2));

eno = new JTextField();

ename = new JTextField();

desig = new JTextField();

sal = new JTextField();

frame.add(new JLabel("Eno."));

frame.add(eno);

frame.add(new JLabel("EName"));

frame.add(ename);

frame.add(new JLabel("Designation"));

frame.add(desig);

frame.add(new JLabel("Salary"));

frame.add(sal);

clear = new JButton("Clear");

insert = new JButton("insert");

Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres", "postgres", "bhalchandra");

insert.addActionListener((ActionEvent e) -> {

try {

insertEmp(conn, eno, ename, desig, sal);

} catch (IOException | SQLException ex) {

Logger.getLogger(EmpApp.class.getName()).log(Level.SEVERE, null, ex);

}

});

clear.addActionListener((ActionEvent e) -> {

eno.setText("");

ename.setText("");

desig.setText("");

sal.setText("");

});

frame.add(insert);

frame.add(clear);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

private static void insertEmp(Connection conn, JTextField eno, JTextField ename, JTextField desig, JTextField sal)

throws IOException, SQLException {

String sql = "insert into emp values(?, ?, ?, ?)";

PreparedStatement ps = conn.prepareStatement(sql);

ps.setInt(1, Integer.parseInt(eno.getText()));

ps.setString(2, ename.getText());

ps.setString(3, desig.getText());

ps.setFloat(4, Float.parseFloat(sal.getText()));

ps.executeUpdate();

}

public class slip1_2

{

public static void main(String[] args) throws SQLException {

new EmpApp();

}

Slip no 2 Q1 Write a java program to read ‘N’ names of your friends, store it into HashSet and

display them in ascending order.

package com.mycompany.practical_slip;

import java.util.*;;

public class slip2_1

{

public static void main(String[] args)

{

HashSet<String> friends = new HashSet<>();

Scanner scan = new Scanner(System.in);

System.out.println("Enter N :");

int n = scan.nextInt();

scan.nextLine();

for(int i = 0 ; i<n;i++)

{

System.out.println("Enter name :");

String name = scan.nextLine();

friends.add(name);

}

TreeSet<String> tree = new TreeSet<>(friends);

System.out.println(tree);

}

Slip no 3 Q1. Write a JSP program to display the details of Patient (PNo, PName, Address, age,

disease) in tabular form on browser*/

<!DOCTYPE html>

<html>

<head>

</head>

<body>

<h1>Patient</h1>

<tr>

<th>PName</th>

<th>Address</th>

<th>disease</th>

</tr>

<tr>

<td>kovid</td>

</<tr>

<tr>

<td>Brock</td>

<td>canser</td>

</<tr>

</table>

</body>

</html>

Slip no 3 Q2. Write a Java program to create LinkedList of String objects and perform the following:

i. Add element at the end of the list

ii. Delete first element of the list

iii. Display the contents of list in reverse order

package com.mycompany.javaslip;

import java.util.*;

public class slip3_2 {

public static void main(String[] args) {

LinkedList<String> names = new LinkedList<>();

Scanner sc = new Scanner(System.in);

int ch;

do {

System.out.println("Menu");

System.out.println("1. Insert at tail");

System.out.println("2. Delete head.");

System.out.println("3. Display in reverse");

System.out.println("4. Exit");

System.out.println("------------------------------");

System.out.println("Enter your choice:");

ch = sc.nextInt();

sc.nextLine();

System.out.println();

switch (ch) {

case 1:

System.out.println("Enter name.");

names.add(sc.nextLine());

break;

case 2:

names.remove();

break;

case 3:System.out.println("Real order");

Iterator itr = names.iterator();

while (it.hasNext())

{

System.out.println(itr.next());

}

Iterator it = names.descendingIterator();

while (it.hasNext())

{

System.out.println(it.next());

}

break;

default:

System.out.println("Invalid choice.");

}

System.out.println("-------------------------------");

} while (ch != 4);

}

Slip no 4 Q1 Write a Java program using Runnable interface to blink Text on the JFrame (Use

Swing)

package com.mycompany.practical_slip;

import java.awt.Color;

import java.util.Random;

import javax.swing.*;

class BlinkText implements Runnable

{

private JFrame frame;

private JLabel blink;

public BlinkText() {

frame = new JFrame("Blink Light");

frame.setSize(200, 200);

blink = new JLabel("Blink");

frame.add(blink);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

@Override

public void run() {

Random rand = new Random();

while(true) {

int r = rand.nextInt(255);

int g = rand.nextInt(255);

int b = rand.nextInt(255);

blink.setForeground(new Color(r, g, b));

}

public class slip4_1

{

public static void main(String[] args) {

Thread t = new Thread(new BlinkText());

t.start();

}

Slip no 4 Q2. Write a Java program to store city names and their STD codes using an appropriate

collection and perform following operations:

i. Add a new city and its code (No duplicates)

ii. Remove a city from the collection

iii. Search for a city name and display the code

package com.mycompany.practical_slip;

import java.util.*;

public class slip4_2

{

public static void main(String[] args) {

Map<String, String> cityMap = new HashMap<>();

Scanner sc = new Scanner(System.in);

int ch;

String code, city;

do {

System.out.println("Menu");

System.out.println("1. Add City and std code.(no duplicates)");

System.out.println("2. Remove City.");

System.out.println("3. Search city name dsiplay std code");

System.out.println("4. Exit");

System.out.println("------------------------------");

System.out.println("Enter your choice:");

ch = sc.nextInt();

sc.nextLine();

System.out.println();

switch(ch) {

case 1: System.out.println("Enter std code.");

code = sc.nextLine();

System.out.println("Enter City.");

city = sc.nextLine();

cityMap.put(code, city);

break;

case 2: System.out.println("Enter std code.");

code = sc.nextLine();

cityMap.remove(code);

break;

case 3: System.out.println("Enter city:");

city = sc.nextLine();

code = null;

for(Map.Entry<String, String> map : cityMap.entrySet()) {

if(map.getValue().equals(city))

code = map.getKey();

}

if(code != null)

System.out.println("Code is " + code);

else

System.out.println("Not found.");

break;

default: System.out.println("Invalid choice.");

}

System.out.println("-------------------------------");

} while(ch != 4);

}

Slip no5 Q1. Write a Java Program to create the hash table that will maintain the mobile number and

student name. Display the details of student using Enumeration interface

package com.mycompany.javaslip;

import java.util.*;

public class slip5_1

{

public static void main(String[] args)

{

Hashtable<String, String> studentTable = new Hashtable<>();

studentTable.put("1234567890", "john");

studentTable.put("1239874560", "carry");

Enumeration<String> moblieNumbers = studentTable.keys();

while(moblieNumbers.hasMoreElements())

{

String no = moblieNumbers.nextElement();

String name = studentTable.get(no);

System.out.println("Student name: " + name + ", Mobile no: " + no);

}

slip no 6 Q1 Write a Java program to accept ‘n’ integers from the user and store them in a Collection.

Display them in the sorted order. The collection should not accept duplicate elements.

(Use a suitable collection). Search for a particular element using predefined search

method in the Collection framework

package com.mycompany.practical_slip;

import java.util.*;

public class slip6_1

{

public static void main(String[] args) {

TreeSet<Integer> nums = new TreeSet<>();

Scanner sc = new Scanner(System.in);

System.out.println("How many number:");

int n = sc.nextInt();

System.out.println("Eneter " + n + " values:");

for(int i=0; i<n; i++)

nums.add(sc.nextInt());

System.out.println(nums);

System.out.println("Enter key to search:");

int key = sc.nextInt();

if(nums.contains(key))

System.out.println("Found.");

else

System.out.println("Not found.");

}

slip no 6 q2 Write a java program using multithreading to simulate traffic signal (Use Swing).

package com.mycompany.practical_slip;

import java.util.logging.*;

class TrafficLight implements Runnable {

String[] lights = {"Red", "Green", "Yellow"};

@Override

public void run() {

int idx = 0;

while(true) {

System.out.println("Current Signal : " + lights[idx]);

try {

Thread.sleep(getDuration(lights[idx]) * 1000);

} catch (InterruptedException ex) {

Logger.getLogger(TrafficLight.class.getName()).log(Level.SEVERE, null, ex);

}

idx = (idx + 1) % lights.length;

}

private int getDuration(String light) {

switch(light) {

case "Red": return 4;

case "Green": return 7;

case "Yellow": return 2;

default : return 0;

}

public class slip6_2

{

public static void main(String[] args) {

Thread t = new Thread(new TrafficLight());

t.start();

}

slip no 7 Q2 Write a java program that implements a multi-thread application that has three threads.

First thread generates random integer number after every one second, if the number is

even; second thread computes the square of that number and prints it. If the number is

odd, the third thread computes the cube of that number and prints it.

package com.mycompany.practical_slip;

import java.util.Random;

import java.util.logging.*;

class NumGenerator implements Runnable {

Random rand = new Random();

int n;

@Override

public void run() {

while(true) {

n = rand.nextInt(100);

System.out.println("Generated number: " + n);

try {

Thread.sleep(1000);

} catch (InterruptedException ex) {

Logger.getLogger(NumGenerator.class.getName()).log(Level.SEVERE, null, ex);

}

class SqrGenerator implements Runnable {

NumGenerator numGenerator;

SqrGenerator(NumGenerator numGenerator) {

this.numGenerator = numGenerator;

}

@Override

public void run() {

while(true) {

int n = numGenerator.n;

if(n % 2 == 0)

System.out.println("Square of " + n + " is " + n*n);

try {

Thread.sleep(1000);

} catch (InterruptedException ex) {

Logger.getLogger(SqrGenerator.class.getName()).log(Level.SEVERE, null, ex);

}

class CubeGenerator implements Runnable {

NumGenerator numGenerator;

int n;

CubeGenerator(NumGenerator numGenerator) {

this.numGenerator = numGenerator;

}

@Override

public void run() {

while(true) {

int n = numGenerator.n;

if(n % 2 != 0)

System.out.println("Cube of " + n + " is " + n*n*n);

try {

Thread.sleep(1000);

} catch (InterruptedException ex) {

Logger.getLogger(CubeGenerator.class.getName()).log(Level.SEVERE, null, ex);

}

public class slip7_1

{

public static void main(String[] args) {

NumGenerator numGenerator = new NumGenerator();

Thread t1 = new Thread(numGenerator);

t1.start();

SqrGenerator sqrGenerator = new SqrGenerator(numGenerator);

Thread t2 = new Thread(sqrGenerator);

t2.start();

CubeGenerator cubeGenerator = new CubeGenerator(numGenerator);

Thread t3 = new Thread(cubeGenerator);

t3.start();

}

slip no 7 q2. Write a java program for the following:

i. To create a Product (Pid, Pname, Price) table.

ii. Insert at least five records into the Product table.

iii. Display all the records from a Product table.

Assume Database is already created

package com.mycompany.practical_slip;

import java.sql.*;

import java.util.Scanner;

public class slip7_2

{

public static void main(String[] args) throws SQLException {

Scanner sc = new Scanner(System.in);

Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres", "postgres", "postgres");

int ch;

do {

System.out.println("Menu");

System.out.println("1. Create table Product.");

System.out.println("2. Insert into Product.");

System.out.println("3. Display records of product.");

System.out.println("4. Exit.");

System.out.println("------------------------------");

System.out.println("Enter your choice:");

ch = sc.nextInt();

switch(ch) {

case 1: create(conn);

break;

case 2: insert(conn);

break;

case 3 : select(conn);

break;

default : System.out.println("Invalid choice.");

break;

}

} while(ch != 4);

}

private static void create(Connection conn) throws SQLException {

String sql = "create table if not exists product("

+ "pid int primary key,"

+ "pname varchar(30),"

+ "price decimal(10, 2))";

Statement stmt = conn.createStatement();

stmt.execute(sql);

}

private static void insert(Connection conn) throws SQLException {

String sql = "insert into product values(?, ?, ?)";

PreparedStatement pt = conn.prepareStatement(sql);

Scanner sc = new Scanner(System.in);

System.out.println("Enter pid:");

int pid = sc.nextInt();

sc.nextLine();

System.out.println("Enter pname:");

String name = sc.nextLine();

System.out.println("Enter price");

float price = sc.nextFloat();

pt.setInt(1, pid);

pt.setString(2, name);

pt.setFloat(3, price);

pt.executeUpdate();

}

private static void select(Connection conn) throws SQLException {

String sql = "select * from product";

Statement stmt = conn.createStatement();

stmt.executeQuery(sql);

ResultSet res = stmt.getResultSet();

while(res.next()) {

System.out.println("Pid = " + res.getInt("pid"));

System.out.println("PName = " + res.getString("pname"));

System.out.println("Price = " + res.getFloat("price"));

System.out.println("----------------------------------------------");

}

slip no 9 Q1. Write a java program to define a thread for printing text on output screen for ‘n’

number of times. Create 3 threads and run them. Pass the text ‘n’ parameters to the

thread constructor.

Example:

i. First thread prints “COVID19” 10 times.

ii. Second thread prints “LOCKDOWN2020” 20 times

iii. Third thread prints “VACCINATED2021” 30 times

package com.mycompany.practical_slip;

class T1 extends Thread {

String msg;

T1(String msg) {

this.msg = msg;

}

public void run() {

for(int i=0; i<10; i++)

System.out.println(msg);

}

class T2 extends Thread {

String msg;

T2(String msg) {

this.msg = msg;

}

public void run() {

for(int i=0; i<20; i++)

System.out.println(msg);

}

class T3 extends Thread {

String msg;

T3(String msg) {

this.msg = msg;

}

public void run() {

for(int i=0; i<30; i++)

System.out.println(msg);

}

public class slip8_1

{

public static void main(String[] args) {

T1 t1 = new T1("COVID19");

T2 t2 = new T2("LOCKDOWN2020");

T3 t3 = new T3("VACCINATED2021");

t1.start();

t2.start();

t3.start();

}

/*slip no 8 Q2*/

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<style>

.prime { color: red; }

</style>

</head>

<body>

<h1>Is prime?</h1>

Enter a number: <input type="text" name="num">

</form>

String numStr = request.getParameter("num");

int n = 0;

if(numStr != null && !numStr.isEmpty()) {

n = Integer.parseInt(numStr);

if(n > 1) {

boolean isPrime = true;

for(int i=2; i<n; i++) {

if(n % i == 0) {

isPrime = false;

break;

}

if(isPrime) {

<h3 class="prime">Prime number</h3>

} else {

<h3 class="prime">Not a prime number</h3>

}

</body>

</html>

slip no 9 Q1. Write a Java program to create a thread for moving a ball inside a panel vertically. The

ball should be created when the user clicks on the start button (Use Swing).

package com.mycompany.practical_slip;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.util.logging.*;

import javax.swing.*;

class BallPanel extends JPanel

{

private int yDelta = 0;

@Override

protected void paintComponent(Graphics g)

{

super.paintComponent(g);

g.setColor(Color.red);

g.fillOval(175, yDelta, 50, 50);

repaint();

}

void setBallPos(int y) {

this.yDelta = y;

}

public class slip9_1

{

private Thread ballThread;

private BallPanel ballPanel;

private JFrame frame;

private JButton start;

slip9_1()

{

frame = new JFrame("Ball Movement App");

frame.setSize(400, 400);

ballPanel = new BallPanel();

start = new JButton("Start");

start.addActionListener((ActionEvent e) ->

{

startBallMovement();

});

frame.setLayout(new BorderLayout());

frame.add(ballPanel, BorderLayout.CENTER);

frame.add(start, BorderLayout.SOUTH);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

private void startBallMovement()

{

if(ballThread == null || !ballThread.isAlive())

{

ballThread = new Thread(() -> {

moveBallVertically();

});

ballThread.start();

}

private void moveBallVertically()

{

int y = 0;

int dir = 1;

while(true)

{

try

{

Thread.sleep(15);

} catch (InterruptedException ex)

{

Logger.getLogger(slip9_1.class.getName()).log(Level.SEVERE, null, ex);

}

y += 5 * dir;

if(y > ballPanel.getHeight() - 50)

dir = -1;

if(y <= 0)

dir = 1;

ballPanel.setBallPos(y);

}

public static void main(String[] args)

{

new slip9_1();

}

slip no 10 Q2. Write a Java program to display first record from student table (RNo, SName, Per) onto

the TextFields by clicking on button. (Assume Student table is already created)

package com.mycompany.javaslip;

import java.awt.GridLayout;

import java.sql.*;

import java.util.logging.*;

import javax.swing.*;

class StudentRec

{

private JFrame frame;

private JTextField tf1, tf2, tf3;

private JButton display;

StudentRec() throws SQLException {

frame = new JFrame("Student First Record.");

frame.setSize(200, 300);

tf1 = new JTextField();

tf2 = new JTextField();

tf3 = new JTextField();

display = new JButton("Show Record");

Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres", "postgres", "postgres");

display.addActionListener((ActionEvent) -> {

try {

select(conn);

} catch (SQLException ex) {

Logger.getLogger(StudentRec.class.getName()).log(Level.SEVERE, null, ex);

}

});

frame.setLayout(new GridLayout(4,1));

frame.add(tf1);

frame.add(tf2);

frame.add(tf3);

frame.add(display);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

private void select(Connection conn) throws SQLException {

String sql = "select * from student where rno = 1";

Statement stmt = conn.createStatement();

stmt.executeQuery(sql);

ResultSet rs = stmt.getResultSet();

while(rs.next()) {

tf1.setText(" " + rs.getInt("rno"));

tf2.setText(" " + rs.getString("sname"));

tf3.setText(" " + rs.getFloat("per") + "");

}

public class slip10_2

{

public static void main(String[] args) throws SQLException {

new StudentRec();

}

slip no 11 q2 Write a Java program to display information about all columns in the DONAR table

using ResultSetMetaData.

package com.mycompany.javaslip;

import java.sql.*;

public class slip11_2

{

public static void main(String[] args) throws SQLException {

Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres", "postgres", "postgres");

String sql = "select * from donar";

Statement stmt = conn.createStatement();

stmt.executeQuery(sql);

ResultSet rs = stmt.getResultSet();

ResultSetMetaData rsmd = rs.getMetaData();

int colCnt = rsmd.getColumnCount();

System.out.println("Donar table Meta Data:");

for(int i=1; i<colCnt; i++) {

String colName = rsmd.getColumnName(i);

String colType = rsmd.getColumnTypeName(i);

int colSize = rsmd.getColumnDisplaySize(i);

System.out.println(colName + " " + colType + "(" + colSize + ")");

}

/* slip no 12 */

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

</head>

<body>

<h1>Is Perfect?</h1>

Enter a number: <input type="text" name="num">

</form>

String numStr = request.getParameter("num");

int n = 0;

if(numStr != null && !numStr.isEmpty()) {

n = Integer.parseInt(numStr);

if(n > 1) {

int sum = 0;

for(int i=1; i<=n/2; i++) {

if(n % i == 0) {

sum += i;

}

if(sum == n) {

<h3>Perfect number</h3>

} else {

<h3>Not a perfect number</h3>

}

</body>

</html>

slip no 12 Q2 Write a Java Program to create a PROJECT table with field’s project_id, Project_name,

Project_description, Project_Status. Insert values in the table. Display all the details of

the PROJECT table in a tabular format on the screen.(using swing).

package com.mycompany.javaslip;

import java.awt.BorderLayout;

import java.sql.*;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import javax.swing.JTable;

class ProjectTable {

private JFrame frame;

private JTable table;

ProjectTable() throws SQLException {

frame = new JFrame("Project Table");

frame.setLayout(new BorderLayout());

frame.setSize(600, 150);

Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres", "postgres", "postgres");

createTable(conn);

insert(conn);

String[] colNames = {"pid", "pname", "description", "status"};

String[][] data = retriveData(conn);

table = new JTable(data, colNames);

JScrollPane scrPane = new JScrollPane(table);

frame.getContentPane().add(scrPane, BorderLayout.CENTER);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

private void createTable(Connection conn) throws SQLException {

String sql = "create table if not exists project("

+ "pid int primary key,"

+ "pname varchar(30),"

+ "description varchar(30),"

+ "status varchar(30))";

Statement stmt = conn.createStatement();

stmt.execute(sql);

}

private void insert(Connection conn) throws SQLException {

String sql = "insert into project values"

+ "(1, 'Game', 'Java Platformer Game', 'complete'),"

+ "(2, 'Website', 'MERN stack', 'complete'),"

+ "(3, 'Portfolio', 'PHP', 'complete')";

Statement stmt = conn.createStatement();

stmt.executeUpdate(sql);

}

private String[][] retriveData(Connection conn) throws SQLException {

String sql = "select * from project";

Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);

ResultSet rs = stmt.executeQuery(sql);

ResultSetMetaData rsmd = rs.getMetaData();

int noCol = rsmd.getColumnCount();

rs.last();

int noRow = rs.getRow();

rs.beforeFirst();

String[][] data = new String[noRow][noCol];

int rowCnt = 0;

while (rs.next()) {

for (int i = 1; i <= noCol; i++)

data[rowCnt][i - 1] = rs.getString(i);

rowCnt++;

}

return data;

}

public class slip12_2

{

public static void main(String[] args) throws SQLException {

new ProjectTable();

}

Slip no 13 Q1 Write a Java program to display information about the database and list all the tables in

the database. (Use DatabaseMetaData).

package com.mycompany.javaslip;

import java.sql.Connection;

import java.sql.DatabaseMetaData;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

public class slip13_1

{

public static void main(String[] args) throws SQLException {

Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres", "postgres", "postgres");

DatabaseMetaData md = conn.getMetaData();

System.out.println("" + md.getDatabaseProductName());

System.out.println("" + md.getDatabaseProductVersion());

System.out.println("" + md.getDriverName());

System.out.println("" + md.getDriverVersion());

ResultSet tables = md.getTables(null, null, "%", new String[]{"TABLE"});

System.out.println("Tables in Database:");

while(tables.next()) {

String tableName = tables.getString("TABLE_NAME");

System.out.println(tableName);

}

Slip no13 Q2 Write a Java program to show lifecycle (creation, sleep, and dead) of a thread. Program

should print randomly the name of thread and value of sleep time. The name of the

thread should be hard coded through constructor. The sleep time of a thread will be a

random integer in the range 0 to 4999.

package com.mycompany.javaslip;

import java.util.Random;

import java.util.logging.Level;

import java.util.logging.Logger;

class ThreadLifeCycle extends Thread {

private String threadName;

ThreadLifeCycle(String threadName) {

this.threadName = threadName;

}

public void run() {

Random rand = new Random();

int sTime = rand.nextInt(5000);

System.out.println(threadName + " is created.");

System.out.println("Sleep time of " + threadName + " is: " + sTime + "ms.");

try {

Thread.sleep(sTime);

} catch (InterruptedException ex) {

Logger.getLogger(ThreadLifeCycle.class.getName()).log(Level.SEVERE, null, ex);

}

System.out.println(threadName + " is dead.");

}

public class slip13_2

{

public static void main(String[] args) {

ThreadLifeCycle t1 = new ThreadLifeCycle("First");

ThreadLifeCycle t2 = new ThreadLifeCycle("Second");

ThreadLifeCycle t3 = new ThreadLifeCycle("Third");

t1.start();

t2.start();

t3.start();

}

slip no 14 Q1 Write a Java program using Multithreading for a simple search engine. Accept a string

to be searched. Search the string in all text files in the current folder. Use a separate

thread for each file. The result should display the filename and line number where the

string is found.

package com.mycompany.javaslip;

import java.io.*;

import java.util.Scanner;

class SearchThread extends Thread {

private File file;

private String searchStr;

SearchThread(File file, String searchStr) {

this.file = file;

this.searchStr = searchStr;

}

public void run() {

searchInFile(file, searchStr);

}

public void searchInFile(File file, String searchStr) {

boolean found = false;

try (BufferedReader br = new BufferedReader(new FileReader(file))) {

String line;

int lineNo = 0;

while ((line = br.readLine()) != null) {

lineNo++;

if (line.contains(searchStr)) {

System.out.println("Found '" + searchStr + "' in " + file.getName() + " at line " + lineNo);

found = true;

}

} catch (IOException ex) {

System.err.println("Error reading file: " + file.getName());

}

if (!found) {

System.out.println(searchStr + " not found in " + file.getName());

}

public class slip14_1

{

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.println("Enter string to be searched in files:");

String searchStr = sc.nextLine();

File currDir = new File(".");

File[] files = currDir.listFiles();

if (files != null) {

boolean foundInAnyFile = false;

for (File file : files) {

if (file.isFile() && file.getName().endsWith(".txt")) {

SearchThread t = new SearchThread(file, searchStr);

t.start();

foundInAnyFile = true;

}

if (!foundInAnyFile) {

System.out.println("No text files found in the current directory.");

}

} else {

System.err.println("Error: Unable to access current directory.");

}

/* slipno 14 Q2 */

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<style>

.res { color: red; font-size: 18px; }

</style>

</head>

<body>

<h1>Calculate sum of fist and last digit?</h1>

Enter a number: <input type="text" name="num">

</form>

String numStr = request.getParameter("num");

int n = 0;

if(numStr != null && !numStr.isEmpty()) {

n = Integer.parseInt(numStr);

int fDigit = n;

while(fDigit >= 10) {

fDigit /= 10;

}

int lDigit = n % 10;

int sum = fDigit + lDigit;

<h3 class="res">Sum of first and last digit is <%= sum %></h3>

}

</body>

</html>

slip no 15 q1 Write a java program to display name and priority of a Thread.

package com.mycompany.javaslip;

class MyThread extends Thread {

public void run() {

System.out.println("Name of the thread: " + Thread.currentThread().getName());

System.out.println("Priority of the thread: " + Thread.currentThread().getPriority());

}

public class slip15_1

{

public static void main(String[] args) {

MyThread t1 = new MyThread();

MyThread t2 = new MyThread();

t1.start();

t2.start();

}

slip no 16 Q1. Write a java program to create a TreeSet, add some colors (String) and print out the

content of TreeSet in ascending order

package com.mycompany.javaslip;

import java.util.*;

public class slip16_1

{

public static void main(String[] args) {

Set<String> colors = new TreeSet<>();

colors.add("Red");

colors.add("Blue");

colors.add("Green");

colors.add("Yellow");

colors.add("Black");

System.out.println(colors);

}

slip no 16 Q2 Write a Java program to accept the details of Teacher (TNo, TName, Subject). Insert at

least 5 Records into Teacher Table and display the details of Teacher who is teaching

“JAVA” Subject. (Use PreparedStatement Interface)

package com.mycompany.javaslip;

import java.sql.*;

import java.util.Scanner;

class Teacher {

Teacher() throws SQLException, SQLException {

Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres", "postgres", "postgres");

for(int i=0; i<5; i++)

insert(conn);

select(conn);

}

private void insert(Connection conn) throws SQLException {

String sql = "insert into teacher values(?, ?, ?)";

PreparedStatement ps = conn.prepareStatement(sql);

Scanner sc = new Scanner(System.in);

System.out.println("Enter tno:");

ps.setInt(1, sc.nextInt());

sc.nextLine();

System.out.println("Enter tname:");

ps.setString(2, sc.nextLine());

System.out.println("Enter subject:");

ps.setString(3, sc.nextLine());

ps.executeUpdate();

}

private void select(Connection conn) throws SQLException {

String sql = "select * from teacher where subject = 'java'";

Statement stmt = conn.createStatement();

ResultSet rs = stmt.executeQuery(sql);

while(rs.next()) {

System.out.println("teacher tno: " + rs.getInt("tno"));

System.out.println("teacher tname: " + rs.getString("tname"));

System.out.println("teacher subject: " + rs.getString("subject"));

}

public class slip16_2

{

public static void main(String[] args) throws SQLException {

new Teacher();

}

Slip no 17 q1Write a java program to accept ‘N’ integers from a user. Store and display integers in

sorted order having proper collection class. The collection should not accept duplicate

elements.

package com.mycompany.javaslip;

import java.util.Scanner;

import java.util.Set;

import java.util.TreeSet;

public class slip17_1

{

public static void main(String[] args) {

Set<Integer> set = new TreeSet<>();

Scanner sc = new Scanner(System.in);

System.out.println("How many integers:");

int n = sc.nextInt();

System.out.println("Enter " + n + " values:");

for(int i=0; i<n; i++)

set.add(sc.nextInt());

System.out.println(set);

}

Slip no 17 Q2 Write a java program using Multithreading to display the number’s between 1 to 100

continuously in a JTextField by clicking on JButton. (Use Runnable Interface &

Swing).

package com.mycompany.javaslip;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.util.logging.*;

import javax.swing.*;

public class slip17_2

{

private JFrame frame;

private JTextField tf;

private JButton print;

private Thread intThread;

slip17_2() {

frame = new JFrame("Integer printing App");

frame.setSize(300, 200);

frame.setLayout(new GridLayout(2,1));

tf = new JTextField();

print = new JButton("Print");

frame.add(tf);

frame.add(print);

print.addActionListener((ActionEvent e) -> {

tf.setText("");

if(intThread == null || !intThread.isAlive()) {

intThread = new Thread(new Runnable() {

@Override

public void run() {

while(true) {

for(int i=1; i<=100; i++) {

tf.setText(String.valueOf(i));

try {

Thread.sleep(500);

} catch (InterruptedException ex) {

Logger.getLogger(S17Q2.class.getName()).log(Level.SEVERE, null, ex);

}

tf.setText("");

}

});

intThread.start();

}

});

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

public static void main(String[] args) {

new S17Q2();

}

Slip n 18 q1 Write a java program using Multithreading to display all the vowels from a given

String. Each vowel should be displayed after every 3 seconds.

package com.mycompany.javaslip;

import java.util.Scanner;

import java.util.logging.*;

public class slip18_1

{

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.println("Enter any string:");

String str = sc.nextLine();

Thread t = new Thread(() -> {

for(int i=0; i<str.length(); i++) {

String str2 = str.toLowerCase();

char ch = str2.charAt(i);

if(ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u') {

System.out.println(ch);

try {

Thread.sleep(3000);

} catch (InterruptedException ex) {

Logger.getLogger(slip18_1.class.getName()).log(Level.SEVERE, null, ex);

}

System.out.println("3 seconds are passed....");

}

});

t.start();

}

slip no 19 Q1 Write a java program to accept ‘N’ Integers from a user store them into LinkedList

Collection and display only negative integers.

package com.mycompany.javaslip;

import java.util.*;

public class slip19_1

{

public static void main(String[] args) {

List<Integer> l = new LinkedList<>();

Scanner sc = new Scanner(System.in);

System.out.println("How many values:");

int n = sc.nextInt();

System.out.println("Enter " + n + " values:");

for(int i=0; i<n; i++)

l.add(sc.nextInt());

System.out.println("Negative integers are:");

Iterator itr = l.iterator();

while(itr.hasNext()) {

int num = (int)itr.next();

if(num < 0)

System.out.println(num);

}

/* Slip no 20*/

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

</head>

<body>

Enter a number :<input type="text" name="num"><br>

</form>

String numStr = request.getParameter("num");

if(numStr != null && !numStr.isEmpty()) {

int t = Integer.parseInt(numStr);

int rev = 0, rem;

// reverse the number

while(t > 0) {

rem = t % 10;

rev = (rev * 10) + rem;

t = t / 10;

}

t = rev;

rev = 0;

while(t > 0) {

rem = t % 10;

rev = (rev * 10) + rem;

t = t / 10;

switch(rem) {

case 0: out.println("zero");

break;

case 1: out.println("one");

break;

case 2: out.println("two");

break;

case 3: out.println("three");

break;

case 4: out.println("four");

break;

case 5: out.println("five");

break;

case 6: out.println("six");

break;

case 7: out.println("seven");

break;

case 8: out.println("eight");

break;

case 9: out.println("nine");

break;

}

</body>

</html>

slip no 20 q2Write a java program using Multithreading to demonstrate drawing temple (Use

Swing)

package com.mycompany.javaslip;

import javax.swing.*;

import java.awt.*;

class TempleDrawing extends JFrame

{

public TempleDrawing()

{

setTitle("Simple Temple Drawing");

setSize(300, 300);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setLocationRelativeTo(null);

TemplePanel templePanel = new TemplePanel();

add(templePanel);

setVisible(true);

}

class TemplePanel extends JPanel

{

@Override

protected void paintComponent(Graphics g)

{

super.paintComponent(g);

drawTemple(g);

}

private void drawTemple(Graphics g)

{

g.setColor(Color.BLACK);

g.fillRect(100, 100, 100, 100); // Main structure

g.setColor(Color.WHITE);

g.fillRect(130, 150, 40, 50); // Main Door

g.setColor(Color.RED);

int[] xPoints = {100, 150, 200}; // Triangle for roof

int[] yPoints = {100, 50, 100};

g.fillPolygon(xPoints, yPoints, 3);

g.setColor(Color.ORANGE);

g.fillRect(150, 40, 20, 10); // Flag

}

public class slip20_2

{

public static void main(String[] args)

{

SwingUtilities.invokeLater(() ->

{

new TempleDrawing();

});

}

slip no 21 Q1. Write a java program to accept ‘N’ Subject Names from a user store them into

LinkedList Collection and Display them by using Iterator interface.

package com.mycompany.javaslip;

import java.util.*;

public class slip21_1

{

public static void main(String[] args) {

List<String> l = new LinkedList<>();

Scanner sc = new Scanner(System.in);

System.out.println("How many subjects:");

int n = sc.nextInt();

sc.nextLine();

System.out.println("Enter " + n + " subjects:");

for(int i=0; i<n; i++)

l.add(sc.nextLine());

System.out.println("Subjects are:");

Iterator itr = l.iterator();

while(itr.hasNext()) {

System.out.println(itr.next());

}

slip no 22 Q2 Write a java program using Multithreading to solve producer consumer problem in

which a producer produces a value and consumer consume the value before producer

generate the next value. (Hint: use thread synchronization)

package com.mycompany.javaslip;

import java.util.LinkedList;

class SharedResource {

private LinkedList<String> buffer = new LinkedList<>();

private int capacity = 1;

public synchronized void produce(String value) {

while(buffer.size() == capacity) {

try {

wait();

} catch(InterruptedException e) {

e.printStackTrace();

}

buffer.add(value);

System.out.println("Produced: " + value);

notifyAll();

}

public synchronized String consume() {

while(buffer.size() == 0) {

try {

wait();

} catch(InterruptedException e) {

e.printStackTrace();

}

String value = buffer.removeFirst();

System.out.println("Consume: " + value);

notifyAll();

return value;

}

class Producer extends Thread {

private SharedResource sharedResource;

public Producer(SharedResource sharedResource) {

this.sharedResource = sharedResource;

}

@Override

public void run() {

for(int i=0; i<5; i++) {

String value = "Value " + i;

sharedResource.produce(value);

try {

sleep(1000);

} catch (InterruptedException e) {

e.printStackTrace();

}

class Consumer extends Thread {

private SharedResource sharedResource;

public Consumer(SharedResource sharedResource) {

this.sharedResource = sharedResource;

}

@Override

public void run() {

for(int i=0; i<5; i++) {

String value = "Value " + i;

sharedResource.consume();

try {

sleep(1000);

} catch (InterruptedException e) {

e.printStackTrace();

}

public class slip21_2

{

public static void main(String[] args) {

SharedResource sharedResource = new SharedResource();

Producer producer = new Producer(sharedResource);

Consumer consumer = new Consumer(sharedResource);

producer.start();

consumer.start();

}

slip no 22 Q1 Write a Menu Driven program in Java for the following: Assume Employee table with

attributes (ENo, EName, Salary) is already created. 1. Insert 2. Update 3. Display 4.

Exit

package com.mycompany.javaslip;

import java.sql.*;

import java.util.Scanner;

public class slip22_1

{

private static void insert(Connection conn) throws SQLException {

String sql = "insert into emp2 values (?, ?, ?)";

PreparedStatement ps = conn.prepareStatement(sql);

Scanner sc = new Scanner(System.in);

System.out.println("Enter eno:");

ps.setInt(1, sc.nextInt());

sc.nextLine();

System.out.println("Enter ename:");

ps.setString(2, sc.nextLine());

System.out.println("Enter salary:");

ps.setFloat(3, sc.nextFloat());

ps.executeUpdate();

}

private static void update(Connection conn) throws SQLException {

Scanner sc = new Scanner(System.in);

System.out.println("Enter eno:");

int eno = sc.nextInt();

sc.nextLine();

System.out.println("Enter new ename:");

String ename = sc.nextLine();

System.out.println("Enter new salary:");

float salary = sc.nextFloat();

String sql = "update emp2 set ename = '" + ename + "', salary = " + salary + " where eno = " + eno;

Statement stmt = conn.createStatement();

stmt.executeUpdate(sql);

}

private static void display(Connection conn) throws SQLException {

String sql = "select * from emp2";

Statement stmt = conn.createStatement();

ResultSet rs = stmt.executeQuery(sql);

System.out.println("Emp table data:");

while (rs.next()) {

System.out.println("eno: " + rs.getInt("eno"));

System.out.println("ename: " + rs.getString("ename"));

System.out.println("salary: " + rs.getFloat("salary"));

}

public static void main(String[] args) throws SQLException {

Scanner sc = new Scanner(System.in);

Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres", "postgres", "postgres");

int ch;

do {

System.out.println("Menu");

System.out.println("1. Insert");

System.out.println("2. Update");

System.out.println("3. Display");

System.out.println("4. Exit");

System.out.println("-------------------------");

System.out.println("Enter your choice:");

ch = sc.nextInt();

switch (ch) {

case 1:

insert(conn);

break;

case 2:

update(conn);

break;

case 3:

display(conn);

break;

}

} while (ch != 4);

}

*/ slip no 22 Q2 */

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<%@page import="java.time.LocalTime" %>

<!DOCTYPE html>

<html>

<head>

</head>

<body>

Enter user name :<input type="text" name="user"><br>

</form>

String user = request.getParameter("user");

if(user != null && !user.isEmpty()) {

LocalTime currTime = LocalTime.now();

int hour = currTime.getHour();

if(hour >= 0 && hour < 12)

out.println("Good Morning " + user);

else if(hour >= 12 && hour <= 18)

out.println("Good Afternoon " + user);

else

out.println("Good Morning " + user);

}

</body>

</html>

slip no 23 Q1 Write a java program using Multithreading to accept a String from a user and display

each vowel from a String after every 3 seconds

package com.mycompany.javaslip;

import java.util.Scanner;

import java.util.logging.*;

public class slip23_1

{

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.println("Enter any string:");

String str = sc.nextLine();

Thread t = new Thread(() -> {

for(int i=0; i<str.length(); i++) {

String str2 = str.toLowerCase();

char ch = str2.charAt(i);

if(ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u') {

System.out.println(ch);

try {

Thread.sleep(3000);

} catch (InterruptedException ex) {

Logger.getLogger(slip23_1.class.getName()).log(Level.SEVERE, null, ex);

}

System.out.println("3 seconds are passed....");

}

});

t.start();

}

Slip no 24 Q1 Write a java program using Multithreading to scroll the text from left to right

continuously (Use Swing).

package com.mycompany.javaslip;

import javax.swing.*;

class TextScrolling extends JFrame implements Runnable {

private JLabel label;

private String text;

private Thread thread;

public TextScrolling(String text) {

this.text = text;

label = new JLabel(text);

add(label);

setSize(300, 100);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setVisible(true);

}

public void startScrolling() {

thread = new Thread(this);

thread.start();

}

@Override

public void run() {

try {

while (true) {

String labelText = label.getText();

labelText = labelText.substring(1) + labelText.charAt(0);

label.setText(labelText);

Thread.sleep(200); // Adjust scrolling speed

}

} catch (InterruptedException e) {

e.printStackTrace();

}

public class slip24_1

{

public static void main(String[] args) {

SwingUtilities.invokeLater(() -> {

TextScrolling ts = new TextScrolling("Hello, this text is scrolling continuously!");

ts.startScrolling();

});

}

SLip no 25 Q2 Write a Java Program for the following: Assume database is already created.

package com.mycompany.javaslip;

import java.awt.BorderLayout;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.logging.Level;

import java.util.logging.Logger;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class slip25_2

{

JFrame frame;

JButton b1, b2, b3;

JTextField tf;

slip25_2() throws SQLException {

frame = new JFrame("DB App");

frame.setLayout(new BorderLayout());

frame.setSize(600, 100);

JPanel p1 = new JPanel();

JPanel p2 = new JPanel();

tf = new JTextField();

p1.setLayout(new GridLayout(1, 2));

p1.add(new JLabel("Type your DDL query:"));

p1.add(tf);

b1 = new JButton("Create Table");

b2 = new JButton("Alter Table");

b3 = new JButton("Drop Table");

p2.setLayout(new GridLayout(1, 3));

p2.add(b1);

p2.add(b2);

p2.add(b3);

Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres", "postgres", "postgres");

b1.addActionListener((ActionEvent e) -> {

try {

create(conn);

} catch (SQLException ex) {

Logger.getLogger(S25Q2.class.getName()).log(Level.SEVERE, null, ex);

}

});

b2.addActionListener((ActionEvent e) -> {

try {

alter(conn);

} catch (SQLException ex) {

Logger.getLogger(S25Q2.class.getName()).log(Level.SEVERE, null, ex);

}

});

b3.addActionListener((ActionEvent e) -> {

try {

drop(conn);

} catch (SQLException ex) {

Logger.getLogger(S25Q2.class.getName()).log(Level.SEVERE, null, ex);

}

});

frame.add(p1, BorderLayout.CENTER);

frame.add(p2, BorderLayout.SOUTH);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

private void create(Connection conn) throws SQLException {

String sql = tf.getText();

Statement stmt = conn.createStatement();

stmt.execute(sql);

}

private void alter(Connection conn) throws SQLException {

String sql = tf.getText();

Statement stmt = conn.createStatement();

stmt.execute(sql);

}

private void drop(Connection conn) throws SQLException {

String sql = tf.getText();

Statement stmt = conn.createStatement();

stmt.execute(sql);

}

public static void main(String[] args) throws SQLException {

new S25Q2();

}

Slip no 26 Q1 Write a Java program to delete the details of given employee (ENo EName Salary).

Accept employee ID through command line. (Use PreparedStatement Interface)

package com.mycompany.javaslip;

import java.sql.*;

public class slip26_1

{

public static void main(String[] args) throws SQLException {

Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres", "postgres", "postgres");

String sql = "delete from emp where id = ?";

PreparedStatement ps = conn.prepareStatement(sql);

ps.setInt(1, Integer.parseInt(args[0]));

ps.executeUpdate();

}

slip no 27 Q1 Write a Java Program to display the details of College (CID, CName, address, Year)

database table on JTable.

package com.mycompany.javaslip;

import java.awt.BorderLayout;

import java.sql.*;

import javax.swing.*;

class CollegeTable {

private JFrame frame;

private JTable table;

CollegeTable() throws SQLException {

frame = new JFrame("Project Table");

frame.setLayout(new BorderLayout());

frame.setSize(600, 150);

Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres", "postgres", "postgres");

String[] colNames = {"cid", "cname", "address", "year"};

String[][] data = retriveData(conn);

table = new JTable(data, colNames);

JScrollPane scrPane = new JScrollPane(table);

frame.getContentPane().add(scrPane, BorderLayout.CENTER);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

private String[][] retriveData(Connection conn) throws SQLException {

String sql = "select * from college";

Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);

ResultSet rs = stmt.executeQuery(sql);

ResultSetMetaData rsmd = rs.getMetaData();

int noCol = rsmd.getColumnCount();

rs.last();

int noRow = rs.getRow();

rs.beforeFirst();

String[][] data = new String[noRow][noCol];

int rowCnt = 0;

while (rs.next()) {

for (int i = 1; i <= noCol; i++)

data[rowCnt][i - 1] = rs.getString(i);

rowCnt++;

}

return data;

}

public class slip27_1

{

public static void main(String[] args) throws SQLException {

new CollegeTable();

}

Slip no 28 Q2 Write a java program to display name of currently executing Thread in multithreading

package com.mycompany.javaslip;

public class slip28_2

{

public static void main(String[] args) {

Thread t = new Thread(() -> {

System.out.println("Name of the thread: " + Thread.currentThread().getName());

});

t.start();

}

Slip no 29 Q1. Write a Java program to display information about all columns in the DONAR table

using ResultSetMetaData.

package com.mycompany.javaslip;

import java.sql.*;

public class slip29_1

{

public static void main(String[] args) throws SQLException {

Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres", "postgres", "postgres");

String sql = "select * from donar";

Statement stmt = conn.createStatement();

stmt.executeQuery(sql);

ResultSet rs = stmt.getResultSet();

ResultSetMetaData rsmd = rs.getMetaData();

int colCnt = rsmd.getColumnCount();

System.out.println("Donar table Meta Data:");

for(int i=1; i<colCnt; i++) {

String colName = rsmd.getColumnName(i);

String colType = rsmd.getColumnTypeName(i);

int colSize = rsmd.getColumnDisplaySize(i);

System.out.println(colName + " " + colType + "(" + colSize + ")");

}

slip no 29 Q2. Write a Java program to create LinkedList of integer objects and perform the following:

i. Add element at first position

ii. Delete last element

iii. Display the size of link list

package com.mycompany.javaslip;

import java.util.*;

public class slip29_2

{

public static void main(String[] args) {

List<Integer> l = new LinkedList<>();

Scanner sc = new Scanner(System.in);

int ch;

do {

System.out.println("Menu");

System.out.println("1. Insert at head");

System.out.println("2. Delete tail.");

System.out.println("3. Display size");

System.out.println("4. Exit");

System.out.println("------------------------------");

System.out.println("Enter your choice:");

ch = sc.nextInt();

System.out.println();

switch(ch) {

case 1: System.out.println("Enter a number:");

l.addFirst(sc.nextInt());

break;

case 2: l.removeLast();

break;

case 3:

System.out.println("Size : " + l.size() + "\n" + l);

break;

default: System.out.println("Invalid choice.");

}

System.out.println("-------------------------------");

} while(ch != 4);

}

Slip no 30 Q1. Write a java program using Multithreading to demonstrate drawing Indian flag (Use

Swing

package com.mycompany.javaslip;

import javax.swing.*;

import java.awt.*;

class IndianFlag extends JFrame {

public IndianFlag() {

setTitle("Simple Temple Drawing");

setSize(300, 300);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setLocationRelativeTo(null);

FlagPanel flagPanel = new FlagPanel();

add(flagPanel);

setVisible(true);

}

class FlagPanel extends JPanel {

@Override

protected void paintComponent(Graphics g) {

super.paintComponent(g);

drawFlag(g);

}

private void drawFlag(Graphics g) {

g.setColor(Color.ORANGE);

g.fillRect(50, 50, 200, 50);

g.setColor(Color.WHITE);

g.fillRect(50, 100, 200, 50);

g.setColor(Color.GREEN);

g.fillRect(50, 150, 200, 50);

}

public class slip30_1

{

public static void main(String[] args) {

SwingUtilities.invokeLater(() -> {

new IndianFlag();

});

}

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