Write a Java program that simulates a very simple, but unconventional, calculato

Question

Write a Java program that simulates a very simple, but unconventional, calculator. The application’s GUI should include two text fields F1 and F2 for numerical input and a label
for output. So, to compute 23 + 56, a user enters 23 into F1 and 56 into F2. There should be four buttons labeled +, ?, * , and /. When button B is pressed, the operation (F1) B (F2) is
computed and the result displayed on the label. If a button is pressed and a field F1 or F2 is empty then the program should display an error message.
Include a button that copies the result of the computation to F1 and another that copies the result to F2. These buttons facilitate subsequent computation using the result of the previous
computation.
A Quit button ends the program.

Explanation / Answer

import java.awt.*;
import java.awt.event.*;

class chegg implements ActionListener //actionlistener interface is implemented here
{
    //Declaring Objects
    Frame f=new Frame();
    Label l1=new Label("First Number");
    Label l2=new Label("Second Number");
    Label l3=new Label("Result");
  
    TextField t1=new TextField();
    TextField t2=new TextField();
    TextField t3=new TextField();
  
    Button b1=new Button("+");
    Button b2=new Button("-");
    Button b3=new Button("*");
    Button b4=new Button("/");
    Button b5=new Button("Quit");
  
    chegg()
    {
        //Giving Coordinates
        l1.setBounds(50,100,100,20);
        l2.setBounds(50,140,100,20);
        l3.setBounds(50,180,100,20);
      
        t1.setBounds(200,100,100,20);
        t2.setBounds(200,140,100,20);
        t3.setBounds(200,180,100,20);
      
        b1.setBounds(50,250,50,20);
        b2.setBounds(110,250,50,20);
        b3.setBounds(170,250,50,20);
        b4.setBounds(230,250,50,20);
        b5.setBounds(290,250,50,20);
      
        //Adding components to the frame
        f.add(l1);
        f.add(l2);
        f.add(l3);
      
        f.add(t1);
        f.add(t2);
        f.add(t3);
      
        f.add(b1);
        f.add(b2);
        f.add(b3);
        f.add(b4);
        f.add(b5);
      
        b1.addActionListener(this);
        b2.addActionListener(this);
        b3.addActionListener(this);
        b4.addActionListener(this);
        b5.addActionListener(this);
      
        f.setLayout(null);
        f.setVisible(true); //we can see the window on the monitor
        f.setSize(400,350);
    }
  
    public void actionPerformed(ActionEvent e)
    {
        int n1=Integer.parseInt(t1.getText()); //getting input as integer
        int n2=Integer.parseInt(t2.getText());//getting input as integer
      
        if(e.getSource()==b1)
        {
            t3.setText(String.valueOf(n1+n2));
        }
          
        if(e.getSource()==b2)
        {
            t3.setText(String.valueOf(n1-n2));
        }
      
        if(e.getSource()==b3)
        {
            t3.setText(String.valueOf(n1*n2));
        }
      
        if(e.getSource()==b4)
        {
            t3.setText(String.valueOf(n1/n2));
        }
      
        if(e.getSource()==b5)
        {
            System.exit(0);
        }
    }
  
    public static void main(String args[])
    {
        new chegg();
    }
}

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