Write a program using swing components to find simple interest. Use text fields for input and output. Your program should display the result when the user presses a button.

Output of the given Java program

Program

 

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

class PTR extends JFrame implements ActionListener //implement listener interface
{
 JTextField t1, t2, t3, t4;
 JLabel l1,l2,l3, l4;
 JButton b1; 
 public PTR() 
 {
  super("Handling Action Event");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
        l1 = new JLabel("Enter P :");
  l2 = new JLabel("Enter T :");
  l3 = new JLabel("Enter R : ");
  l4 = new JLabel("Interest : ");
  t1 = new JTextField(10);
  t2 = new JTextField(10);
  t3 = new JTextField(10);
  t4 = new JTextField(10); 
  b1 = new JButton("Calculate");
  
  setLayout(new FlowLayout(FlowLayout.LEFT,150,10));
        add(l1);
  add(t1);
  add(l2);
  add(t2);
  add(l3);
  add(t3);
  add(l4);
  add(t4); 
  add(b1);

  b1.addActionListener(this);//Registering event

  setSize(400,300);
        setVisible(true);
 }
 
 public void actionPerformed(ActionEvent ae) //Handle Event
 {
  int p, t, r, si; 
  p = Integer.parseInt(t1.getText());   
  t = Integer.parseInt(t2.getText()); 
  r = Integer.parseInt(t3.getText());
  if(ae.getSource() == b1)
   si = (p*t*r)/100;
  else
   si = 0; 

  t4.setText(String.valueOf(si));
 }

 public static void main(String a [])
 {
  new PTR();
 }
}