Java program to implement file input stream class to read binary data from image file.

import java.io.FileInputStream;

import java.io.IOException;

public class ReadImageFile {

    public static void main(String[] args) {

        String imagePath = "yourImageFile.jpg"; // Replace with the actual image file path and name

        try (FileInputStream fileInputStream = new FileInputStream(imagePath)) {

            int byteRead;

            while ((byteRead = fileInputStream.read()) != -1) {

                System.out.print((char) byteRead);

            }

        } catch (IOException e) {

            System.err.println("Error reading the image file: " + e.getMessage());

        }

    }

}

Java program to merge two text files in to third file.

import java.io.*;

public class MergeFiles {

    public static void main(String[] args) {

        String inputFile1 = "inputFile1.txt"; // Replace with the actual file path and name

        String inputFile2 = "inputFile2.txt"; // Replace with the actual file path and name

        String outputFile = "outputFile.txt"; // Replace with the desired output file path and name

        mergeFiles(inputFile1, inputFile2, outputFile);

        System.out.println("Files merged successfully!");

    }

    private static void mergeFiles(String inputFile1, String inputFile2, String outputFile) {

        try (BufferedReader reader1 = new BufferedReader(new FileReader(inputFile1));

             BufferedReader reader2 = new BufferedReader(new FileReader(inputFile2));

             BufferedWriter writer = new BufferedWriter(new FileWriter(outputFile))) {

            String line;

            // Merge content from inputFile1

            while ((line = reader1.readLine()) != null) {

                writer.write(line);

                writer.newLine();

            }

            // Merge content from inputFile2

            while ((line = reader2.readLine()) != null) {

                writer.write(line);

                writer.newLine();

            }

        } catch (IOException e) {

            System.err.println("Error merging files: " + e.getMessage());

        }

    }

}

Java program to read a text file and displays it's contents on screen.

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

public class ReadTextFile {

    public static void main(String[] args) {

        String filePath = "yourFileName.txt"; // Replace with the actual file path and name

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

            String line;

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

                System.out.println(line);

            }

        } catch (IOException e) {

            System.err.println("Error reading the file: " + e.getMessage());

        }

    }

}

Java program to check greatest among three numbers where input numbers are given by user.

import java.applet.Applet;

import java.awt.Button;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Label;

import java.awt.TextField;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class GreatestNumberApplet extends Applet implements ActionListener {

    TextField num1Field, num2Field, num3Field;

    Label resultLabel;

    public void init() {

        Label num1Label = new Label("Enter Number 1:");

        num1Field = new TextField(10);

        Label num2Label = new Label("Enter Number 2:");

        num2Field = new TextField(10);

        Label num3Label = new Label("Enter Number 3:");

        num3Field = new TextField(10);

        Button checkButton = new Button("Check Greatest");

        checkButton.addActionListener(this);

        resultLabel = new Label("");

        // Set background color

        setBackground(Color.lightGray);

        // Adding components to the applet

        add(num1Label);

        add(num1Field);

        add(num2Label);

        add(num2Field);

        add(num3Label);

        add(num3Field);

        add(checkButton);

        add(resultLabel);

    }

    public void actionPerformed(ActionEvent e) {

        int num1 = Integer.parseInt(num1Field.getText());

        int num2 = Integer.parseInt(num2Field.getText());

        int num3 = Integer.parseInt(num3Field.getText());

        int greatestNumber = findGreatestNumber(num1, num2, num3);

        resultLabel.setText("Greatest Number: " + greatestNumber);

    }

    private int findGreatestNumber(int a, int b, int c) {

        int max = a;

        if (b > max) {

            max = b;

        }

        if (c > max) {

            max = c;

        }

        return max;

    }

}

Java Applet program to draw rectangle and right-aligned oval of orange color.

import java.applet.Applet;

import java.awt.Color;

import java.awt.Graphics;

public class RectangleAndOvalApplet extends Applet { 

    public void paint(Graphics g) { 

   // Draw a rectangle with orange color

   g.setColor(Color.ORANGE); 

   g.drawRect(50, 50, 100, 80); 

   // Draw a right-aligned oval with orange color     g.setColor(Color.ORANGE); 

   int ovalX = getWidth() - 150; // Right-aligned

   int ovalY = 50; 

   int ovalWidth = 100; 

   int ovalHeight = 80; 

   g.fillOval(ovalX, ovalY, ovalWidth, ovalHeight); }

}

Java program to calculate area and perimeter of circle using interfaces.

interface Shape {

    double calculateArea();

}

interface CircleProperties {

    double calculatePerimeter();

}

class Circle implements Shape, CircleProperties {

    private double radius;

    public Circle(double radius) {

        this.radius = radius;

    }

    public double calculateArea() {

        return Math.PI * radius * radius;

    }

    public double calculatePerimeter() {

        return 2 * Math.PI * radius;

    }

}

public class CircleCalculator {

    public static void main(String[] args) {

        Circle myCircle = new Circle(5.0);

        System.out.println("Area of the circle: " + myCircle.calculateArea());

        System.out.println("Perimeter of the circle: " + myCircle.calculatePerimeter());

    }

}

Java program to check marks out of Bound exception.

import java.util.Scanner;

public class MarksProcessor {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter the marks: ");

        int marks = scanner.nextInt();

        try {

            validateMarks(marks);

            System.out.println("Marks are within the valid range.");

        } catch (MarksOutOfBoundsException e) {

            System.out.println("Exception: " + e.getMessage());

        }

    }

    private static void validateMarks(int marks) throws MarksOutOfBoundsException {

        if (marks > 100) {

            throw new MarksOutOfBoundsException("Marks out of Bound: Marks cannot be greater than 100.");

       }

    }

}