请问keyEvent cannot be resolved to a type 怎么解决？

Question

这是我写了一半的贪吃蛇代码，但是我却无法解决键盘事件的一个问题。这些代码是我照着参考书的键盘事件写的。请问我的代码出现了什么问题？

问题：

Exception in thread "main" java.lang.Error: Unresolved compilation problems:
The method addKeyListener(KeyListener) in the type Component is not applicable for the arguments (new PythonGame_Java.KeyListener(){})
The type new PythonGame_Java.KeyListener(){} must implement the inherited abstract method PythonGame_Java.KeyListener.keyPressed(keyEvent)
keyEvent cannot be resolved to a type
The method game(Graphics) in the type DrawPanel is not applicable for the arguments ()

at 挑战Java编贪吃蛇.PythonGame_Java.main(PythonGame_Java.java:30)


代码如下：

package 挑战Java编贪吃蛇;

import java.awt.*;
import java.awt.event.KeyEvent;
import java.util.EventListener;

import javax.swing.*;

import java.io.*;

public class PythonGame_Java extends JFrame{ //蟒蛇游戏(贪吃蛇) Java语言  (我之前用Python编了类似的程序)
    public PythonGame_Java(){ //<init>
        super();
        init();
    }
    public interface KeyListener extends EventListener{
        public void keyPressed(keyEvent e);
    }
    public void init(){
        this.setSize(900,600);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setContentPane(new DrawPanel());
        this.setTitle("Java贪吃蛇");
        setResizable(false);
        setVisible(true);
    }
    public static void main(String[] args) throws InterruptedException {
        PythonGame_Java Game = new PythonGame_Java();
    JTextArea textArea = new JTextArea();
    textArea.addKeyListener(new KeyListener() {
        public void keyPressed(keyEvent e){
            String keyTest=KeyEvent.getKeyText(e.getKeyCode());
            System.out.println(keyTest);
        }
    });
    class DrawPanel extends JPanel{ //蛇身宽度=10
        private boolean started=true;
        private final int wait_time=300;
        private int snake[][]=new int[10000][2];
        private int length=0;
        private int currx=0;
        private int curry=0;
        private int BonusX=10;
        private int BonusY=10;
        private int loopnum=0;
        private String snake_dir="right";
        public void main(String[] args){
            game();
        }
        public void game(Graphics g) throws InterruptedException{
            snake[0][0]=0;
            snake[0][1]=0;
            while(started==true){
                g.setColor(Color.WHITE);
                g.fillRect(0,0,900,600);
                g.setColor(Color.BLUE);
                for(int i=0;i<=length;i++)
                    g.fillRect(snake[i][0]*10,snake[i][1]*10,10,10);
                switch(snake_dir){
                case "left":
                    currx--;
                case "right":
                    currx++;
                case "up":
                    curry--;
                case "down":
                    curry++;
                }
                if(currx<0)
                    currx=0;
                if(curry<0)
                    curry=0;
                if(currx>90)
                    currx=90;
                if(curry>60)
                    curry=60;
                snake[loopnum][0]=currx;
                snake[loopnum][1]=curry;
                loopnum++;
                if(loopnum>length)
                    loopnum=0;
                if(currx==BonusX && curry==BonusY){
                    length++;
                    BonusX=(int)(Math.random())*91;
                    BonusY=(int)(Math.random())*61;
                }
                Thread.sleep(wait_time);
            }   //游戏循环结束
        }       //游戏函数结束
    }           //子类结束
}}              //父类结束？

Answer 1

https://blog.csdn.net/testcs_dn/article/details/39643119/