Java 我的蛇游戏有点小错误

当我在黄点（）中“点击”时，我有时会看到这个错误（有时出现，有时不出现），但我不知道为什么。。 我知道也许它看起来很混乱，但这是我第一次用java制作游戏

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 22
at Gameplay.paint(Gameplay.java:140)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5210)
at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1579)
at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1502)
at javax.swing.RepaintManager.paint(RepaintManager.java:1272)
at javax.swing.JComponent._paintImmediately(JComponent.java:5158)
at javax.swing.JComponent.paintImmediately(JComponent.java:4969)
at javax.swing.RepaintManager$4.run(RepaintManager.java:831)
at javax.swing.RepaintManager$4.run(RepaintManager.java:814)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:814)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:789)
at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:738)
at javax.swing.RepaintManager.access$1200(RepaintManager.java:64)
at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1732)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

以下是我的绘画方法：

 if (enemyXPos[xPos] == snakeXLenght[0] && enemyYPos[yPos] == snakeYLenght[0]) {

        score++;
        lenghtOfSnake++;
        xPos = random.nextInt(34);
        yPos = random.nextInt(23);
    }

    //line140:
    enemyImage.paintIcon(this, graphics, enemyXPos[xPos], enemyYPos[yPos]);


    for (int b = 1; b < lenghtOfSnake; b++) {
        if (snakeXLenght[b] == snakeXLenght[0] && snakeYLenght[b] == snakeYLenght[0]) {
            right = false;
            left = false;
            up = false;
            down = false;

            graphics.setColor(Color.white);
            graphics.setFont(new Font("arial", Font.BOLD, 50));
            graphics.drawString("YOU LOSE", 300, 300);

            graphics.setFont(new Font("arial", Font.BOLD, 20));
            graphics.drawString("Space to  RESTART", 350, 340);
        }
    }

    graphics.dispose();
}

---

如果我没有显示足够的代码，只需说，然后我粘贴更多。

在

Gameplay.java

中，在线

140

（在您的

paint（）

方法中），您正试图从数组中获取一些内容。该数组比您给它的索引小（您试图在索引

22

处获取项，但该数组可能有

21

或更少的项）

---

确保

enemyXPos

和

enemyYPos

分别等于或大于

xPos

和

yPos

。

此代码不足以给出具体答案，但看起来您的

enemyXPos

或

enemyYPos

大小不够。

哪一行是140？你的问题是xPos、yPos或b的值。“enemyImage.paintIcon（这是，图形，enemyXPos[xPos]，enemyYPos[yPos]）；”这是一条线，仔细检查敌方阵列的定位。我的猜测是

xPos=random.nextInt（34）；yPos=随机。nextInt（23）其中一个大于数组的大小。如果我不得不猜测的话，我会说这是一个简单的错误。我同意@RJ7，检查您的数组。您是否尝试了解异常的含义以及它如何帮助您解决问题？private int[]enemyXPos={25,50,75,100,125,150,175,200,225,250,275,300,325,350,375,400,425,450,475,500,525,550,575,600,625,650,675,700,725,750,775,800,825,850};        private int[]enemyYPos={75100125150175200225250275300325350375 4004254504755052557560625}；这应该是一个评论，供将来参考。这不是一个格式正确的答案。private int[]enemyXPos={25,50,75,100,125,150,175,200,225,250,275,300,325,350,375,400,425,450,475,500,525,550,575,600,625,650,675,700,725,750,775,800,825,850}；private int[]enemyYPos={75100125150175200225250275300325350375 4004254504755052557560625}@Pablito请回答你的问题，而不是在那篇难以辨认的文章的评论中发布你的更新，但你是对的，我的数组“EnemyPos”有22个元素，我想使用23个元素…：但是我仍然不知道为什么有时候我会犯这个错误，而不是在我启动应用程序的时候，我很高兴我能帮上忙。祝你好运，帕布里托@Pablito，您只有在某些情况下才会收到此消息，因为错误取决于
random.nextInt
调用返回的值。
private int[] enemyXPos = {25, 50,  75,  100, 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 500, 525, 550, 575, 600, 625, 650, 675, 700, 725, 750, 775, 800, 825, 850};
private int[] enemyYPos = {75, 100, 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 500, 525, 575, 600, 625};