Java输入不适用于canvas

Question

我正在使用Java制作基本程序。 我得到输入使用此代码：

package main;
import java.awt.event.KeyEvent;
import java.awt.event.KeyAdapter;

public class Input extends KeyAdapter{
    public void keyPressed(KeyEvent ke){
        _press[ke.getKeyCode()] = true;
        _pressed[ke.getKeyCode()] = true;
    }
    public void keyReleased(KeyEvent ke){
        _press[ke.getKeyCode()] = false;
        _released[ke.getKeyCode()] = true;
    }
    public void update(){
        for (int i = 0; i < _press.length; i ++){
            _pressed[i] = false;
            _released[i] = false;
        }
    }
    /**
     * checks if a key is being pressed
     * @param key an integer representing a key(Key class recommended)
     * @return boolean
     */
    public static boolean check(int key){
        if (_press[key]) return true; else return false;
    }
    /**
     * checks if a key was pressed
     * @param key an integer representing a key(Key class recommended)
     * @return boolean
     */
    public static boolean pressed(int key){
        if (_pressed[key]) return true; else return false;
    }
    /**
     * checks if a key was released
     * @param key an integer representing a key(Key class recommended)
     * @return boolean
     */
    public static boolean released(int key){
        if (_released[key]) return true; else return false;
    }
    protected static boolean[] _press = new boolean[128];
    protected static boolean[] _pressed = new boolean[128];
    protected static boolean[] _released = new boolean[128];
}

我运行测试，我有一个使用ArrayList工作的基本实体系统，一切都很好。

但后来我遇到了图形。

我设置了一个Jcanvas类（扩展了Canvas），但是在将它添加到我的框架后，图形将正常工作，但我的输入根本不再有效。

canvas = new Jcanvas();
canvas.setSize(width, height);
canvas.setBackground(Color.RED);
frame.add(canvas);

//input
frame.addKeyListener(new Input());

有没有办法解决这个问题，还是我会陷入图形或输入？

这是我的Jcanvas类供参考：

package main;
import java.awt.Canvas;
import java.awt.Graphics;

public class Jcanvas extends Canvas{
    static final long serialVersionUID = 42L;
    public void paint(Graphics g){
    }
    public void drawrect(int x, int y, int width, int height){
        Graphics g = getGraphics();
        //g.setColor(Color.blue);
        g.drawRect(x, y, width, height);
    }
    public void drawfill(Graphics g, int x, int y, int width, int height){
    }
}

Answer 1

尝试添加：

//input
Input input = new Input();
frame.addKeyListener(input);
canvas.addKeyListener(input);