Notes

mport javax.swing.*;
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;



public class SumCalculator extends JFrame {

// Swing components
private JTextField num1Field, num2Field, sumField;

public SumCalculator() {
// Set up the frame
setTitle("Sum Calculator");
setSize(300, 200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setLayout(new GridLayout(4, 2));

// Labels and text fields for number 1 and number 2
JLabel num1Label = new JLabel("Number 1:");
num1Field = new JTextField();
JLabel num2Label = new JLabel("Number 2:");
num2Field = new JTextField();

// Label and text field for sum (output)
JLabel sumLabel = new JLabel("Sum:");
sumField = new JTextField();
sumField.setEditable(false); // Output field should be non-editable

// Add components to the frame
add(num1Label);
add(num1Field);
add(num2Label);
add(num2Field);
add(sumLabel);
add(sumField);

// Add key listeners to the input fields to handle key events
num1Field.addKeyListener(new KeyAdapter() {
@Override
public void keyReleased(KeyEvent e) {
calculateSum();
}
});

num2Field.addKeyListener(new KeyAdapter() {
@Override
public void keyReleased(KeyEvent e) {
calculateSum();
}
});

setVisible(true);
}

// Method to calculate the sum of the two input numbers
private void calculateSum() {
try {
// Get values from the input fields
int num1 = Integer.parseInt(num1Field.getText());
int num2 = Integer.parseInt(num2Field.getText());

// Calculate the sum
int sum = num1 + num2;

// Display the result in the sumField
sumField.setText(String.valueOf(sum));
} catch (NumberFormatException ex) {
// If input is invalid (e.g., empty or non-numeric), clear the sumField
sumField.setText("");
}
}

public static void main(String[] args) {
// Run the program
SwingUtilities.invokeLater(SumCalculator::new);
}
}