錯誤：<匿名米$ 1>不是抽象的，不覆蓋abstrac方法的actionPerformed（ActionEvent的）中的ActionListener

Question

我有此代碼動作偵聽器的：

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

public class m extends Applet 
{ 
    Button b1=new Button("click here"); 

    public void init() 
    { 
     b1.addActionListener(new ActionListener() 
     { 
      public void ActionPerformed(ActionEvent e) 
      { 
        System.out.println("Button was clicked "); 
      } 
     }); 
     add(b1); 
    } 
} 

產生這種錯誤：

error: <anonymous m$1> is not abstract and does not override abstrac method actionPerformed(ActionEvent) in ActionListener 

有沒有人知道這個錯誤是什麼原因？

Answer 1

您的功能ActionPerformed應該被命名爲actionPerformed。 Java方法名稱區分大小寫。

b1.addActionListener(new ActionListener() 
    { 
     @Override 
     public void actionPerformed(ActionEvent e) 
     { 
       System.out.println("Button was clicked "); 
     } 
    });