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;

    }

}