button event
import java.awt.*;// import functions
import java.awt.event.*;
public class buttonevent extends Frame implements ActionListener {
int num;
Button b1;
TextField t1;
public buttonevent() {//constructor
setLayout(new FlowLayout());
b1 = new Button("click me");//button named "click me" is created.
t1 = new TextField(20);
add(b1);//that button is added to the frame by add function.
add(t1);
b1.addActionListener(this);
}
public void actionPerformed(ActionEvent ae) {//event function
String cmd = ae.getActionCommand();
if (num == 0) {
System.out.println(cmd);
}
if (cmd.equals("click me")) {
num++;
}
if ((num % 2) != 0) {
t1.setText("Hello Buddy!");
}
if ((num % 2) == 0) {
t1.setText(" ");
System.out.println(num);
}
}
public static void main(String args[]) {//main function
buttonevent ob = new buttonevent();
ob.setSize(500, 500);
ob.setVisible(true);
ob.setTitle("button Event Handling");
}
}