我不知道为什么,但是什么也没出现?

我想有一个小房子。

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


public class color extends JApplet
{
    public void init()
    {
        addMouseListener(new MyMouseListener());
        getContentPane().setBackground(Color.white);
    }
    public class MyMouseListener implements MouseListener
    {
    public void mouseClicked(MouseEvent e)
    {
           int x = e.getX();
           int y = e.getY();
           boolean closeDoors = true;

           if(x>330 && x<280 && y>20 && y<20)
           {
               closeDoors = false;
               repaint();

           }

    }
    public void mouseEntered(MouseEvent e) { }
    public void mouseExited(MouseEvent e) { }
    public void mousePressed(MouseEvent e) { }
    public void mouseReleased(MouseEvent e) { }
    }
    public void paint ( Graphics g, boolean closeDoors)
           {
                super.paint (g);

                do
                {
               g.drawLine (35, 50, 570, 50);
                g.drawLine (35, 50, 250, 0);
                g.drawLine (250, 0, 570, 50);
                g.drawRect (50, 50, 500, 350);
                g.fillRect (100, 75, 80, 80);
                g.fillRect (400, 75, 80, 80);
                g.fillRect (240, 200, 125, 200);
                }
                 while (closeDoors = true);

                 if (closeDoors = false);
                {
                g.drawLine (35, 50, 570, 50);
                g.drawLine (35, 50, 250, 0);
                g.drawLine (250, 0, 570, 50);
                g.drawLine (180, 120, 100, 120);
                g.drawLine (400, 120, 480, 120);
                g.drawLine (140, 75, 140, 160);
                g.drawLine (450, 75, 450, 160);
                g.drawRect (50, 50, 500, 350);
                g.drawRect (100, 75, 80, 80);
                g.drawRect (400, 75, 80, 80);
                g.drawRect (240, 200, 125, 200);
                g.drawOval (330,280, 20, 20);
                }
            }
}

最佳答案

我会尽力帮助您步入正轨:-)

您可能已经知道这一点,但是如果您不使用IDE,建议您使用appletviewer来开发小程序,而不要使用浏览器。只是值得深思的:-)

首先,Toader Mihai Claudiu的建议是正确的。更改

            do
            {
           g.drawLine (35, 50, 570, 50);
            g.drawLine (35, 50, 250, 0);
            g.drawLine (250, 0, 570, 50);
            g.drawRect (50, 50, 500, 350);
            g.fillRect (100, 75, 80, 80);
            g.fillRect (400, 75, 80, 80);
            g.fillRect (240, 200, 125, 200);
            }
             while (closeDoors = true);

             if (closeDoors = false);
            {


进入

            if (closeDoors)
            {
           g.drawLine (35, 50, 570, 50);
            g.drawLine (35, 50, 250, 0);
            g.drawLine (250, 0, 570, 50);
            g.drawRect (50, 50, 500, 350);
            g.fillRect (100, 75, 80, 80);
            g.fillRect (400, 75, 80, 80);
            g.fillRect (240, 200, 125, 200);
            }
            else
            {


否则,只要closeDoors为true,就将进行绘画。您只需要油漆一次。 Java会要求您在必要时再次绘制(例如,当您调用repaint()时)。

另外,将closeDoors设置为成员变量。换句话说,具有:

public class color extends JApplet
{
  public boolean closeDoors = false;


而且,当您在点击侦听器中切换closeDoors的值时,可以将其简化为:

       int x = e.getX();
       int y = e.getY();

       if(x>330 && x<280 && y>20 && y<20)
       {
           closeDoors = !closeDoors;
           repaint();

       }


当您单击特定区域时,这将反转closeDoors的值。换句话说,如果closeDoorstrue,它将被设置为false,反之亦然。

请注意,您的代码if(x>330 && x<280 && y>20 && y<20)可能根本无法工作,因为y永远不能同时大于20和小于20。我将让您使用它来找出有效的方法:-)。

希望这可以帮助。



只是一个小细节,但是您可能应该调用类Color而不是color来遵循Java的standard naming convention,或者如果您不想与java.awt.Color冲突,则可以使用其他名称。

10-08 03:36