write a program to count the number of clicks performed by the user in a frame window (using Swing in java )

 

write a program to count the number of clicks performed by the user in a frame window

(using Swing in java )

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

class CounterTest extends JFrame implements ActionListener {

    private int count = 0;

    JLabel lblData;

    CounterTest ()

    {setLayout(new FlowLayout());

        lblData = new JLabel("button clicked a times");

        JButton btn = new JButton("Click me");

        btn.addActionListener((ActionListener) this);

        add(lblData);

        add(btn);

    }

    public void actionPerformed(ActionEvent e) {

        count++;

        lblData.setText(" Button clicked " + count + "times");

    }

    public static void main(String args[]) {

        CounterTest  ex = new CounterTest();

        ex.setVisible(true);

    }

}

OUTPUT:  

Develop a program using label (swing) to display message “Welcome to java”;

 

SWING

Develop a program using label (swing)  to display message “Welcome to java”;

import java.awt.*;

class L {

        L() {

                Frame f = new Frame();

                Label l1 = new Label("Welcome to Java");

                l1.setBounds(100, 50, 120, 80);

                f.add(l1);

                f.setSize(500, 500);

                f.setLayout(null);

                f.setVisible(true);

        }

        public static void main(String a[]) {

                new L();

        }

}

output; 

Read develop a program in which read the file by using scanner class.

  READ A FILE 

import java.util.Scanner;

import java.io.File;

public class file {

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

    try {

      File x = new File("a.txt");

      Scanner sc = new Scanner(x);

      while (sc.hasNext()) {

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

      }

      sc.close();

    } catch (Exception e) {

      System.out.println("Error");

 

    }

}

}

OUTPUT: SSS

File System Develop a program and write it to files by using Formatter class IN JVA

 

FILE SYSTEM IN JAVA 

import java.util.*;

public class file {

        public static void main(String args[]) {

            try {

                Formatter f = new Formatter("a.txt");

                f.format("avinash");

                f.format("rathod");

                f.close();

   

            } catch (Exception e) {

                System.out.println("Error");

            }

        }

    }

 

OUTPUT: avinashrathod

Write a program to check the arithmetic exception by using try and catch

 

EXCEPTION HANDLING 

import java.io.*;

class exception {

    public static void main(String[] args) {

        int a = 5;

        int b = 0;

        try {

            System.out.println(a / b);

        } catch (ArithmeticException e) {

            e.printStackTrace();

        }

    }

}

OUTPUT: java.lang.ArithmeticException: / by zero

Exception Handling Write a program to show the arithmetic exception using throws.

 Exception Handling     

public class exception {

    static void checkAge(int age) throws ArithmeticException {

      if (age < 18) {

        throw new ArithmeticException("Access denied - You must be at least 18 years old.");

      } else {

        System.out.println("Access granted - You are old enough!");

      }

   }

   

   public static void main(String[] args) {

     checkAge(15);

   }

 

}

OUTPUT: Exception in thread "main" java.lang.ArithmeticException: Access denied - You must be at least 18 years old.

        

develop a program which implements concepts of overriding(any example )

OVERRIDEING

class Animal {

    public void makeSound() {

        System.out.println("Grr...");

    }

}

class Cat extends Animal {

    public void makeSound() {

        System.out.println("Meow");

    }

}

class Program {

    public static void main(String[] args) {

        Cat c = new Cat();

        c.makeSound();

    }

}

OUTPUT : Meow