Java ActionListener错误：不兼容的类型 [英] Java ActionListener error: incompatible types

问题描述

我在JButton上设置ActionListener时遇到了一些问题，这里是代码......

I'm having some trouble setting up an ActionListener on a JButton, here is the code...

package pipes;

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

public class PipesUI extends javax.swing.JFrame {

    Main main = new Main();

    JButton addPipeButton = new JButton("Add Pipe");

    public PipesUI(){
        addUI();
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    private void addUI(){
        addPipeButton.addActionListener(this);
    }

     public void actionPerformed(ActionEvent e){
      if (e.getSource()==addPipeButton)
          main.addPipe();
       else
          ;
    }

    public static void main(String args[]) {
        PipesUI pipesUI = new PipesUI(); //  create an instance of the menu
        pipesUI.setSize(500,500);
        pipesUI.setVisible(true);
    }
}

错误在
addPipeButton行.addActionListener（this）;

The error is on the line addPipeButton.addActionListener(this);

它似乎不喜欢（这个），错误说不兼容的类型：PipesUI无法转换为ActionListener

The (this) it doesn't seem to like, the error says 'incompatible types: PipesUI cannot be converted to ActionListener'

任何帮助都会非常感谢。

Any help would be great thanks.

推荐答案

您创建了 actionPerformed 方法，但是您没有声明您的类为 ActionListener 。实现该接口：

You created your actionPerformed method, but you didn't declare your class as an ActionListener. Implement that interface:

public class PipesUI extends javax.swing.JFrame implements ActionListener {

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