Write a java program to create a GUI that resembles a telephone keypad.

 

import java.awt.*;
import javax.swing.*;

public class Telephone {
 public static void main(String[] args) {
 JFrame frame = new JFrame();
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.setSize(new Dimension(250, 200));
 frame.setTitle("Telephone");

 frame.setLayout(new BorderLayout());

 // main phone buttons
 JPanel centerPanel = new JPanel(new GridLayout(4, 3));
 for (int i = 1; i <= 9; i++) {
 centerPanel.add(new JButton("" + i));
 }
 centerPanel.add(new JButton("*"));
 centerPanel.add(new JButton("0"));
 centerPanel.add(new JButton("#"));
frame.add(centerPanel, BorderLayout.CENTER);

// south status panel
 JPanel southPanel = new JPanel(new FlowLayout());
 southPanel.add(new JLabel("Number to dial: "));
 southPanel.add(new JTextField(10));
 frame.add(southPanel, BorderLayout.SOUTH);
 frame.setVisible(true);
 }
}

Output :

 

You can construct a JPanel object with no parameters, or you can specify the layout manager to use. Once you’ve constructed the panel, you can add components to it using its add method:

// creates a JPanel container with a FlowLayout
JPanel panel = new JPanel(new FlowLayout());
panel.add(new JButton("button 1"));
panel.add(new JButton("button 2"));

A common strategy is to use a BorderLayout for the frame, then add panels to some or all of its five regions. For example, the following code produces a window that looks like a telephone keypad, using a panel with a GridLayout in the center region of the frame and a second panel with a FlowLayout in the south region of the frame.

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