Create a Simple Calculator using Java AWT:

1. Create a Java Class ('CalculatorApp'):
   • We’ll create a class named 'CalculatorApp' that extends Frame (from AWT) and implements 'ActionListener' to handle button clicks.
2. Define GUI Components:
   • Create labels for displaying instructions and results ('Label').
   • Create text fields for user input and displaying the result ('TextField').
   • Create buttons for operations ('Button').
3. Set Layout and Positioning:
   • Use layout managers like 'FlowLayout' or 'BorderLayout' for dynamic resizing and alignment of components.
4. Handle Button Actions:
   • Implement 'actionPerformed(ActionEvent e)' method to perform operations based on button clicks.
5. Display the Frame:
   • Set the frame visible and specify its size.
     

     Program to create a simple calculator using Java AWT

import java.awt.*;
import java.awt.event.*;
 
class Calculator implements ActionListener
{
  
Frame f=new Frame();
Label l1=new Label("Enter Number");
Label l2=new Label("Enter Number");
Label l3=new Label("Result");
TextField t1=new TextField();
TextField t2=new TextField();
TextField t3=new TextField();
Button b1=new Button("Add");
Button b2=new Button("Sub");
Button b3=new Button("Mul");
Button b4=new Button("Div");
  
  
Calculator()
{
l1.setBounds(50,100,100,20);
l2.setBounds(50,150,100,20);
l3.setBounds(50,200,100,20);    
t1.setBounds(200,100,100,20);
t2.setBounds(200,150,100,20);
t3.setBounds(200,200,100,20);  
b1.setBounds(50,250,50,20);
b2.setBounds(110,250,50,20);
b3.setBounds(170,250,50,20);
b4.setBounds(230,250,50,20);
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);
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b4.addActionListener(this);
f.setLayout(null);
f.setVisible(true);
f.setSize(500,500);
}
  
  
public void actionPerformed(ActionEvent e)
{
int i=Integer.parseInt(t1.getText());
int j=Integer.parseInt(t2.getText());
    
if(e.getSource()==b1)
{
t3.setText(String.valueOf(i+j));
}
      
if(e.getSource()==b2)
{
t3.setText(String.valueOf(i-j));
}
    
if(e.getSource()==b3)
{
t3.setText(String.valueOf(i*j));
}
    
if(e.getSource()==b4)
{
t3.setText(String.valueOf(i/j));
}
}
  
public static void main(String args[])
{
new Calculator()
}

Explanation:

• Labels ('Label'): Used to display instructions (‘Number 1:', ‘Number 2:', ‘Result:').
• TextFields ('TextField'): Input fields for entering numbers ('textField1', textField2) and displaying the result ('resultField').
• Buttons ('Button'): 'addButton', 'subButton', 'mulButton', 'divButton' for performing operations.
• Layout ('GridLayout'): Using 'GridLayout(5, 2, 10, 10)' to organize components in rows and columns with specific gaps between them.
• ActionListener ('ActionListener'): Implemented to handle button clicks and perform corresponding arithmetic operations.