GUI Rectangle Window 2 - Java Sample Program

//Java program to create a window and place four labels
//Filename: RectangleProgramTwo.java

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

public class RectangleProgramTwo extends JFrame
{
private static final int WIDTH = 400;
private static final int HEIGHT = 300;
private JLabel lengthL, widthL, areaL, perimeterL;
public RectangleProgramTwo()
{
setTitle("Area and Perimeter of a Rectangle");
lengthL = new JLabel("Enter the length: ", SwingConstants.RIGHT);
widthL = new JLabel("Enter the width: ", SwingConstants.RIGHT);
areaL = new JLabel("Area: ", SwingConstants.RIGHT);
perimeterL = new JLabel("Perimeter: ", SwingConstants.RIGHT);

Container pane = getContentPane();
pane.setLayout(new GridLayout(4, 1));
pane.add(lengthL);
pane.add(widthL);
pane.add(areaL);
pane.add(perimeterL);

setSize(WIDTH, HEIGHT);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}

public static void main(String[] args)
{
RectangleProgramTwo rectObject = new RectangleProgramTwo();
}
}

//Sample Output