import java.awt.*;
import java.awt.event.*;

public class MouseClick {
  Label lbl;
  public static void main(String[] args) {
    MouseClick MC = new MouseClick();
  }

  public MouseClick(){
    Frame f = new Frame("Check out the mouse click");
    Panel p = new Panel();
    Button button = new Button("Click Me");
    button.addMouseListener(new MyMouseListener());
    p.add(button, BorderLayout.NORTH);
    f.add(p,BorderLayout.NORTH);
    lbl = new Label("Prepared for Class.");
    f.add(lbl, BorderLayout.CENTER);
    f.addWindowListener(new WindowAdapter(){
      public void windowClosing(WindowEvent we){
        System.exit(0);
      }
    });
    f.setSize(400,400);
    f.setVisible(true);
  }
  
  public class MyMouseListener extends MouseAdapter{
    public void mouseClicked(MouseEvent me){
      String str = lbl.getText();
      if (str.equals("Prepared for Class.")){
        lbl.setText("The Knowledge of the day before.");
      }
      else if (str.equals("The Knowledge of the day before.")){
        lbl.setText("Prepared for Class.");
      }
    }
  }
}