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 Practical no.1(a):- package day1; public class construc { int age; String name; public construc() { System.out.println("Default Constructor"); } public construc(int age,String name) { this.age=age; this.name=name; } construc(construc cons) { this.age=cons.age; this.name=cons.name; } void show() { System.out.println(age+" "+name); } public static void main(String[] args) { construc c=new construc(19,"Bavadurga"); System.out.println("with argument constructor"); c.show(); System.out.println("copy constructor"); construc c1=new construc(c); c1.show(); } } Practical no.1(b):- package day1; class calculator{ void add() { int a=10; int b=50; int c=a+b; System.out.println(c); } void add(String name) { System.out.println(name); } void add(int num1,int num2) { int c=num1+num2; System.out.println(c); } } public class MethodOverloading { public static void main(String[] args) { calculator obj=new calculator(); obj.add("Bavadurga"); } } ...

import javax.swing.*; import java.awt.*; import java.util.Random; public class BouncingBalls extends JFrame {     private static final int WIDTH = 800;     private static final int HEIGHT = 600;     private static final int BALL_SIZE = 20;     private static final Color[] COLORS = {Color.RED, Color.BLUE, Color.GREEN, Color.ORANGE, Color.MAGENTA};     private JPanel canvas;     public BouncingBalls() {         setTitle("Bouncing Balls");         setSize(WIDTH, HEIGHT);         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         canvas = new JPanel() {             @Override             protected void paintComponent(Graphics g) {                 super.paintComponent(g);                 for (Ball ball : balls) {...

 Create a swing application that randomly changes color on button click.  import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.util.Random; public class RandomColorChanger extends JFrame {     private JPanel colorPanel;     private JButton changeColorButton;     public RandomColorChanger() {         setTitle("Random Color Changer");         setSize(300, 200);         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         // Initialize components         colorPanel = new JPanel();         colorPanel.setBackground(Color.WHITE); // Initial background color is white         changeColorButton = new JButton("Change Color");         // Add action listener to the button         changeColorButton.addActionListener(new ActionListener() {     ...

 Create a Swing application to demonstrate use of scrollpane to change its color selected using colour chooser. import javax.swing.*; import java.awt.*; import java.awt.event.*; public class ScrollPaneColorChooserDemo extends JFrame {     private JTextArea textArea;     private JScrollPane scrollPane;     private JButton colorButton;     public ScrollPaneColorChooserDemo() {         setTitle("ScrollPane Color Chooser Demo");         setSize(400, 300);         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);                  // Create a JTextArea         textArea = new JTextArea(10, 30);                  // Create a JScrollPane and add the JTextArea to it         scrollPane = new JScrollPane(textArea);                ...

Write a program to define user defined exceptions and raise them as per the requirements. Code: class InvalidAgeException extends Exception {     public InvalidAgeException(String message) {         super(message);     } } class User {     private String name;     private int age;     public User(String name, int age) throws InvalidAgeException {         if (age < 18) {             throw new InvalidAgeException("Age must be 18 or older.");         }         this.name = name;         this.age = age;     }     public void displayUserInfo() {         System.out.println("Name: " + name);         System.out.println("Age: " + age);     } } public class Main {     public static void main(String[] args) {         try...