Boutton Read And Stop

import java.awt.event.*;

public class ChangeButtonText {
public static void main(String[] args) {
JFrame frm = new JFrame();
JButton btn = new JButton("Play");
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
JButton b = (JButton)ae.getSource();
if (b.getText().equals("Play"))
b.setText("Stop");
else
b.setText("Play");
}
});
frm.add(btn);
frm.setSize(100, 40);
frm.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frm.setVisible(true);
}
}

import javax.swing.*;