当鼠标点击该文本字段时,我需要使该程序从文本字段中清除文本.我已经尝试了一些事情,但是他们都没有为我工作.

以下是代码全部：

public class TimerClassPanel extends JFrame implements MouseListener{

public TimerClassPanel(){

setTitle("Timer Class");

setSize(WIDTH,HEIGHT);

timer = new Timer(DELAY,new TimerEventHandler());

pane = getContentPane();

pane.setLayout(null);

int r = (int)(9.0 * Math.random()) + 1;

String str2 = Integer.toString(r);

label = new JLabel(str2,SwingConstants.CENTER);

label.setSize(150,30);

label.setLocation(0,0);

textField = new JTextField();

textField.setSize(150,30);

textField.setLocation(150,0);

startB = new JButton("Start");

startbh = new StartButtonHandler();

startB.addActionListener(startbh);

startB.setSize(100,30);

startB.setLocation(0,30);

stopB = new JButton("Stop");

stopbh = new StopButtonHandler();

stopB.addActionListener(stopbh);

stopB.setSize(100,30);

stopB.setLocation(100,30);

exitB = new JButton("Exit");

ebHandler = new ExitButtonHandler();

exitB.addActionListener(ebHandler);

exitB.setSize(100,30);

exitB.setLocation(200,30);

pane.add(label);

pane.add(textField);

pane.add(startB);

pane.add(stopB);

pane.add(exitB);

timer = new Timer(DELAY,new TimerEventHandler());

setVisible(true);

setDefaultCloSEOperation(EXIT_ON_CLOSE);

}

private class TimerEventHandler implements ActionListener{

public void actionPerformed(ActionEvent e){

int r = (int)(9.0 * Math.random()) + 1;

String str = Integer.toString(r);

currentNum = "";

currentNum = str;

label.setText(str);

repaint();

}

}

public class StartButtonHandler implements ActionListener{

public void actionPerformed(ActionEvent e){

timer.start();

}

}

public class StopButtonHandler implements ActionListener{

public void actionPerformed(ActionEvent e){

timer.stop();

}

}

private class ExitButtonHandler implements ActionListener{

public void actionPerformed(ActionEvent e){

System.exit(0);

}

}

public static void main(String[] args){

TimerClassPanel timerPanel = new TimerClassPanel();

JOptionPane.showMessageDialog(null,"Type your guess (int between 1-9)" +

" in the field then press 'ENTER'");

}

@Override

public void mouseClicked(MouseEvent e) {

if( e.getX() > 150 && e.getX() < 300 && e.getY() > 0 && e.getY() < 30)

{

textField.setText("");

repaint();

}

}

@Override

public void mouseEntered(MouseEvent arg0) {

// TODO Auto-generated method stub

}

@Override

public void mouseExited(MouseEvent arg0) {

// TODO Auto-generated method stub

}

@Override

public void mousePressed(MouseEvent arg0) {

// TODO Auto-generated method stub

}

@Override

public void mouseReleased(MouseEvent arg0) {

// TODO Auto-generated method stub

}

}