java - 我正在尝试为 JPanel 窗口背景着色。但是执行后我得到的 JPanel 窗口没有任何颜色。代码中出现什么错误？

Question

我正在尝试为 JPanel 窗口背景着色。但执行后我得到的 JPanel 窗口没有任何颜色。代码中有什么错误？

package BrickBreaker;

import java.awt.Color;
import java.awt.Graphics;

import javax.swing.JPanel;
import javax.swing.Timer;

public class Gameplay extends JPanel {

    private boolean play = false;
    private int totalBrick = 28;
    private Timer time;
    private int delay = 8;
    private int ballPosX = 120;
    private int ballPosY = 350;
    private int ballXdir = -1;
    private int ballYdir = -2;
    private int playerX = 350;

    public Gameplay() {

    }

    public void paint(Graphics g) {
        g.setColor(Color.black);
        g.fillRect(1, 1, 692, 592);
    }

}

Answer 1

检查颜色是否需要大写:g.setColor(Color.BLACK);

如果不尝试使用jPanel.setBackground(Color.BLACK);