Question

Using Java, create the following GUI:

Area and Perimeter of a Rectangle Enter the lengttc 25 Enter the widtc 15 Area: 3750 Perimeter: e0.0 Calculate Exit FIGURE 6-8 Sample run for the final RectangleProgram

Answer 1

Java Program:

/* Java Program that calculates Average Grade */

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.lang.Math.*;

public class RectangleGUI extends JFrame implements ActionListener
{
   //Labels
JLabel lblLength, lblWidth, lblArea, lblPerimeter;
  
   //Text fields
   JTextField tfLength, tfWidth, tfArea, tfPerimeter;
  
   //Button
   JButton btn1, btn2;

RectangleGUI()
{
       GridLayout grid = new GridLayout(6,4);
       setLayout(grid);
       //Setting properties of frame
setVisible(true);
setSize(350, 250);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle(" Area and Perimeter of Rectangle");
      
       //Labels setting
lblLength = new JLabel(" Enter the length: ");
lblWidth = new JLabel(" Enter the width: ");
lblArea = new JLabel(" Area: ");
lblPerimeter = new JLabel(" Perimeter: ");
  
       //Creating text field objects
       tfLength = new JTextField();
       tfWidth = new JTextField();
       tfArea = new JTextField();
       tfPerimeter = new JTextField();
      
       //Creating button object
btn1 = new JButton(" Calculate ");
btn2 = new JButton(" Exit ");
      
       //Adding action listener
btn1.addActionListener(this);
      
       // Exit button click event
       btn2.addActionListener(new ActionListener()
       {
           public void actionPerformed(ActionEvent e)
           {
               System.exit(0);
           }
       });
      
       //Setting display position of labels
       lblLength.setBounds(80, 70, 200, 30);
lblWidth.setBounds(80, 110, 200, 30);
lblArea.setBounds(80, 150, 200, 30);
lblPerimeter.setBounds(80, 250, 200, 30);
      
       //Setting display position of text fields
       tfLength.setBounds(300, 70, 200, 30);
       tfWidth.setBounds(300, 110, 200, 30);
tfArea.setBounds(300, 150, 200, 30);
tfPerimeter.setBounds(300, 190, 200, 30);
      
       //Setting display position of button
       btn1.setBounds(300, 300, 200, 200);
       btn2.setBounds(400, 400, 200, 200);

       //Adding to frame
add(lblLength);
add(tfLength);
add(lblWidth);
add(tfWidth);
       add(lblArea);
       add(tfArea);
       add(lblPerimeter);
       add(tfPerimeter);
      
       add(btn1);
       add(btn2);
}

   //Button action event
public void actionPerformed(ActionEvent e)
{
       double avg;
          
       //Getting values from text boxes
       double len = Double.parseDouble(tfLength.getText());  
       double wid = Double.parseDouble(tfWidth.getText());  
       double area;
       double perimeter;
      
       //Calculating area and perimeter
       area = len*wid;
       perimeter = 2*(len+wid);
      
       //Displaying futureVal
       tfArea.setText(String.format ("%.1f", area));
       tfPerimeter.setText(String.format ("%.1f", perimeter));
   }
  
   //Main function
public static void main(String args[])
{
new RectangleGUI();
}
}

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Sample Run: