Question

请问Java中使用ButtonListener的错误，代码内容如下，在eclipse中编译不过。

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class TestActionEvent extends JFrame {
//Create to buttons
private JButton jbtOk = new JButton ("OK");
private JButton jbtCancel = new JButton ("Cancel");

public TestActionEvent (){
//Set the window title
setTitle ("TestActionEvent");

//Set FlowLayout manger to arrange the components
//inside the frame
getContentPane ().setLayout (new FlowLayout ());

//Add button to the frame
getContentPane ().add(jbtOk);
getContentPane ().add(jbtCancel);

//Create a listener object
ButtonListener btListener = new ButtonListener ();

//Register listeners
jbtOk.addActionListener(btListener);
jbtCancel.addActionListener(btListener);
}

/**Main method**/
public static void main (String [] args){
TestActionEvent frame = new TestActionEvent ();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize (100, 80);
frame.setVisible(true);
}
}

Answer 1

ButtonListener btListener = new ButtonListener ();
ButtonListener 不是核心类，需要你自己写一下，放在源代码里面，做内部类就行
class ButtonListener implements ActionListener{
public void actionPerformed(ActionEvent e) {
//你要执行的任务
}
}

或者就像楼上说的方法，直接使用匿名内部类的代码方式

jdtOK.addActionListener ( new ActionListener() {
public void actionPerformed(ActionEvent e) {
//你要执行的任务
}});

Answer 2

你是想实现button的事件绑定么？
jdk中没有ButtonListener这个类。
如果要实现按钮绑定的话用
jdtOK.addActionListenernew ActionListener(){
public void actionPerformed(ActionEvent e) {
//你要执行的任务
}
});
这种方法

Answer 3

package first1;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Button extends JFrame {
//Create to buttons
private JButton jbtOk = new JButton ("OK");
private JButton jbtCancel = new JButton ("Cancel");

public Button (){
//Set the window title
setTitle ("TestActionEvent");

//Set FlowLayout manger to arrange the components
//inside the frame
getContentPane ().setLayout (new FlowLayout ());

//Add button to the frame
getContentPane ().add(jbtOk);
getContentPane ().add(jbtCancel);
//Create a listener object
// ButtonListener btListener = new ButtonListener();

//Register listeners
jbtOk.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent arg0) {

}

});
jbtCancel.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent arg0) {

}

});
}

/**Main method**/
public static void main (String [] args){
Button frame = new Button ();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize (100, 80);
frame.setVisible(true);
}
}

Answer 4

缺少包