我正在做一个家庭作业，在一个 java 小程序中画一个房子。房子在一个大的主矩形中有三个矩形，代表一扇门和两个窗户。我需要在点击时改变窗户的颜色，我已经达到了绘制房子并绘制门窗的程度，但是我无法根据点击鼠标来改变它们的颜色。我很难确定为什么会这样。

总之，房子被绘制；门窗矩形被绘制并填充为黑色。当点击任何窗户或门矩形时，什么都不会发生，没有错误，颜色也没有变化。

代码如下：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Graphics;
public class DrawHouse extends JApplet implements MouseListener
{
    private int mX; //variable to hold x position of the mouse cursor when clicked
    private int mY; //variable to hold y position of the mouse cursor when clicked
    private int rect1x;
    private int rect1y;
    private int rect1w;
    private int rect1h;
    private int rect2x;
    private int rect2y;
    private int rect2w;
    private int rect2h;
    private int rect3x;
    private int rect3y;
    private int rect3w;
    private int rect3h;
    boolean rect1Clicked;
    boolean rect2Clicked;
    boolean rect3Clicked;
    public void init()
    {
        super.init();
    }
    public void paint(Graphics g)
    {
        super.paint(g);
        Polygon pg = new Polygon();
        pg.addPoint(280, 200);
        pg.addPoint(470, 100);
        pg.addPoint(670, 200);
        g.drawPolygon(pg);
        g.setColor(Color.BLACK);
        g.drawRect(300, 200, 350, 300);
        g.fillRect(350, 300, 50, 100);
        g.fillRect(550, 300, 50, 100);
        g.fillRect(440, 300, 75, 200);
        addMouseListener(this);
        if(rect1Clicked || rect2Clicked || rect3Clicked)
        {
            g.setColor(Color.GRAY);
            g.clearRect(rect1x, rect1y, rect1w, rect1h);
            g.fillRect(rect1x, rect1y, rect1w, rect1h);
            g.setColor(Color.GRAY);
            g.clearRect(rect2x, rect2y, rect2w, rect2h);
            g.fillRect(rect2x, rect2y, rect2w, rect2h);
            g.setColor(Color.GRAY);
            g.clearRect(rect3x, rect3y, rect3w, rect3h);
            g.fillRect(rect3x, rect3y, rect3w, rect3h);
        }
    }
    @Override
    public void mouseClicked(MouseEvent e) 
    {
        rect1x = 350;
        rect1y = 300;
        rect1w = 350;
        rect1h = 300;
        rect2x = 550;
        rect2y = 300;
        rect2w = 50;
        rect2h = 100;
        rect3x = 440;
        rect3y = 300;
        rect3w = 75;
        rect3h = 200;
        mX = e.getX();
        mY = e.getY();
        if(mX > rect1x && mX < rect1x + rect1w && mY > rect1y && mY < rect1y + rect1h)
        {
            rect1Clicked = true;
        }
        else
        { 
            rect1Clicked = false;
        }
        if(mX > rect2x && mX < rect2x + rect2w && mY > rect2y && mY < rect2y+rect2h)
        {
            rect2Clicked = true;
        }
        else
        {
            rect2Clicked = false;
        }
        if(mX > rect3x && mX < rect3x + rect3w && mY > rect3y && mY < rect3y + rect3h)
        {
            rect3Clicked = true;
        }
        else
        {
            rect3Clicked = false;
        }
    }
}

提前感谢您的任何建议。