Frame Program in Java

import java.awt.*;

import java.awt.event.*;

public class GUIFrame extends Frame
{

private Label l1,l2;

TextField t1,t2,t3;

Button badd;

public GUIFrame()
{

super("GUI Application");

setLayout(new FlowLayout());

l1 = new Label("Enter First Number:");

l2 = new Label("Enter Second Number:");

t1 = new TextField(20);

t2 = new TextField(20);

t3 = new TextField(20);

badd = new Button("Add");

add(l1);

add(t1);

add(l2);

add(t2);

add(t3);

add(badd);


badd.addActionListener(new ListenEvent(this)); /*Registration of the button with the event Listener Interface */

setSize(400,300);

setVisible(true);


}


public static void main(String args[])
{
GUIFrame g = new GUIFrame();
}


}


class ListenEvent implements ActionListener
{


GUIFrame g1;

ListenEvent(GUIFrame g1)
{
this.g1 = g1;
}

public void actionPerformed(ActionEvent e)
{
int n1,n2;

n1 = Integer.parseInt(g1.t1.getText());

n2 = Integer.parseInt(g1.t2.getText());

g1.t3.setText(String.valueOf(n1+n2));

}
}