Question

记录按钮按下次数的java代码中在jb.addActionListener这一行有一个错误，不知道怎么错了

package chapter03.sample7_4;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Sample7_4 extends JFrame{
private JPanel jp=new JPanel();
private JButton jb=new JButton("按钮");
private JLabel jl=new JLabel("按钮按下了0次");
private int count=0;
public Sample7_4(){
jp.add(jb);
jp.add(jl);
this.add(jp);
jb.addActionListener(new ActionLisrener(){
public void actionPerformed(ActionEvent e){
Sample7_4.this.jl.setText("按钮按下了"+(++count)+"次");
}
});

this.setBounds(100,100,400,130);
this.setVisible(true);
}

public static void main(String[] args){
new Sample7_4();
}

}

Answer 1

package sample;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Sample7_4 extends JFrame
{
    public static void main(final String[] args)
    {
        new Sample7_4();
    }
    
    private JPanel  jp    = new JPanel();
    private JButton jb    = new JButton("按钮");
    private JLabel  jl    = new JLabel("按钮按下了0次");
    private int     count = 0;
    
    public Sample7_4()
    {
        jp.add(jb);
        jp.add(jl);
        this.add(jp);
        jb.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(final ActionEvent e)
            {
                jl.setText("按钮按下了" + ++count + "次");
            }
        });
        
        this.setBounds(100, 100, 400, 130);
        setVisible(true);
    }
}

拼写错误

Answer 2

打错字了
new ActionLisrener

new ActionListener