write java program using Grid Bag Layout

import java.awt.Button;

import java.awt.CardLayout;

import java.awt.FlowLayout;

import java.awt.GridBagConstraints;

import java.awt.GridBagLayout;

import javax.swing.JFrame;

public class AWTGridBagLayoutDemo extends JFrame {

public static void main(String[] args) {

AWTGridBagLayoutDemo gbld = new AWTGridBagLayoutDemo();

}

public AWTGridBagLayoutDemo() {

setSize(300, 300);

setPreferredSize(getSize());

setVisible(true);

setDefaultCloseOperation(EXIT_ON_CLOSE);

GridBagLayout gbl = new GridBagLayout();

GridBagConstraints gbcnt = new GridBagConstraints();

setLayout(gbl);

setTitle("Java Layout Manager: GridBag Layout");

GridBagLayout layout = new GridBagLayout(); //create grid bag layout

this.setLayout(layout);

//below code is customization of grid fashion

gbcnt.fill = GridBagConstraints.HORIZONTAL;

gbcnt.gridx = 1;

gbcnt.gridy = 0;

this.add(new Button("Smart Phone"), gbcnt);

gbcnt.gridx = 2;

gbcnt.gridy = 0;

this.add(new Button("Laptop"), gbcnt);

gbcnt.fill = GridBagConstraints.HORIZONTAL;

gbcnt.ipady = 20;

gbcnt.gridx = 1;

gbcnt.gridy = 1;

this.add(new Button("Tablet"), gbcnt);

gbcnt.gridx = 2;

gbcnt.gridy = 1;

this.add(new Button("Desktop"), gbcnt);

gbcnt.gridx = 1;

gbcnt.gridy = 2;

gbcnt.fill = GridBagConstraints.HORIZONTAL;

gbcnt.gridwidth = 2;

this.add(new Button("Computer"), gbcnt);

}

}