Question

我的Java小程序在编译时出现问题，请指教（本人初学者）

源程序如下：

import java.awt.*;
import java.awt.event.*;
public class TestAddListener implements ActionListener,WindowListener {
Frame f;
Button b;
public void create() {
f=new Frame("Add Listeners");
b=new Button("press me");
b.addActionListener(this);
b.addWindowListener(this);
f.add(b,"North");
f.setSize(200,200);
f.setVisible(true);
}

public static void main(String args[]) {
TestAddListener ta=new TestAddListener();
ta.create();
}

public void actionPerformed(ActionEvent e) {
System.out.println("the Button is pressed");
}

public void windowActivated(WindowEvent e) {}
public void windowDeactivated(WindowEvent e) {}
public void windowClosed(WindowEvent e) {}
public void windowClosing(WindowEvent e) {}
public void windowIconified(WindowEvent e) {}
public void windowDeiconified(WindowEvent e) {}
public void windowOpened(WindowEvent e) {}
}

编译时出现如下错误：

TestAddListener.java:10: 找不到符号
符号： 方法 addWindowListener(TestAddListener)
位置： 类 java.awt.Button
b.addWindowListener(this);
^
1 错误

我看了很久找不到问题所在，望各位前辈指点，多谢！

Answer 1

Buttin只能注册动作监视器,窗口监视器是监听窗口的.
要用b.addActionListener();

Answer 2

为什么要给button加一个WindowListener...它只是一个按钮而已...

应该是f.addWindowListener吧..

Answer 3

button要加也是ActionEvent（）吧！这部分都没怎么学！

Answer 4

b是一个按钮类，没有这个方法addWindowListener();