Question

Create a class Calculator.java that has two JTextFields, multiply JButton, divide JButton, equals JButton, and a JLabel that present the user with the results.

Answer 1

Program screenshot:

​Sample Output:

​Run 1

​Run 2

​Run 3

Program To copy:

/************************************************************************
*This program uses GUI and performs multiplication, division. *
*It also checks whether the two numbers are equal or not         *
************************************************************************/

//Include the header file.
import java.awt.event.*;
import javax.swing.*;

public class Calculator implements ActionListener {

//Define the text fields,buttons and label.
JTextField t1,t2;
JLabel l;
JButton b1,b2,b3;

//Class constructor.
Calculator()
{
  //Make the frame.
  JFrame fr = new JFrame();
  
  //Make the text field 1.
  t1 = new JTextField();
  t1.setBounds(50,50,100,20);
  
  //Make the text field 2.
  
  t2 = new JTextField();
  t2.setBounds(50, 100, 100, 20);
  
  //Make the button for multiplication.
  b1 = new JButton("*");
  b1.setBounds(30,150,50,50);
  
  //Make the button for division.
  b2 = new JButton("/");
  b2.setBounds(100,150,50,50);
  
  //Make the button for equal.
  b3 = new JButton("=");
  b3.setBounds(170,150,50,50);
  
  //Make the label for output.
  l = new JLabel();
  l.setBounds(100,220,250,50);
  
  
  b1.addActionListener(this);
  b2.addActionListener(this);
  b3.addActionListener(this);
  
  //Add all the above objects into the frame.
  fr.add(t1);fr.add(t2);
  fr.add(b1);fr.add(b2);
  fr.add(b3);
  fr.add(l);
  
  fr.setSize(400,400);
  fr.setLayout(null);
  fr.setVisible(true);
}

//Define the function actionPerformed.
public void actionPerformed(ActionEvent ae)
{
  //Prompt the user to enter the numbers
  String s1 = t1.getText();
  String s2 = t2.getText();
  
  int x,y;
  
  //convert the entered string into numbers.
  x = Integer.parseInt(s1);
  y = Integer.parseInt(s2);
  
  int z = 0;
  String p,q,r;
  
  //Try block for wrong input like divide by zero.
  try
  {
   //Perform the multiplication.
  if(ae.getSource() == b1)
  {
   z = x * y;
   p = String.valueOf(z);
   l.setText(p);
  }
  
  //Perform the division.
   if(ae.getSource() == b2)
  {
   z = x / y;
   q = String.valueOf(z);
   l.setText(q);
  }
  
   //Check whether two numbers are equal or not.
  if(ae.getSource() == b3)
  {
   if(x==y)
   {
    r = "True";
    l.setText(r);
   }
   else
   {
    r = "False";
    l.setText(r);
   }
  }
  }catch(Exception e)
  {
   l.setText("Wrong input " + e);
  }

}

//Main function.
public static void main(String[] args)
{
  new Calculator();
}
}