Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at SnakeV2.ObjectGeneration.paintApple(ObjectGeneration.java:56)
at SnakeV2.SnakeTestNewGen.paintComponent(SnakeTestNewGen.java:91)
at java.desktop/javax.swing.JComponent.paint(JComponent.java:1074)
at java.desktop/javax.swing.JComponent.paintToOffscreen(JComponent.java:5255)
at java.desktop/javax.swing.RepaintManager$PaintManager.paintDoubleBufferedImpl(RepaintManager.java:1643)
at java.desktop/javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1618)
at java.desktop/javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1556)
at java.desktop/javax.swing.RepaintManager.paint(RepaintManager.java:1323)
at java.desktop/javax.swing.JComponent._paintImmediately(JComponent.java:5203)
at java.desktop/javax.swing.JComponent.paintImmediately(JComponent.java:5013)
at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:865)
at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:848)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:848)
at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:823)
at java.desktop/javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:772)
at java.desktop/javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1884)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
public void paintApple(Graphics g) {
xStone = xApple;
yStone = yApple;
if (snake.getLength() >= 0 && snake.getScore() <= 100) {
g.fillRoundRect(xApple, yApple, size, size, 10, 10);
} else if (snake.getLength() >= 10 && snake.getScore() >= 110) {
if (num == 0) {
g.fillRoundRect(xApple, yApple, size, size, 10, 10);
g.fillRoundRect(xStone + 10, yStone, size, size, 10, 10);
} else if (num == 1) {
g.fillRoundRect(xApple, yApple, size, size, 10, 10);
g.fillRoundRect(xStone - 10, yStone, size, size, 10, 10);
} else if (num == 2) {
g.fillRoundRect(xApple, yApple, size, size, 10, 10);
g.fillRoundRect(xStone, yStone + 10, size, size, 10, 10);
} else if (num == 3) {
g.fillRoundRect(xApple, yApple, size, size, 10, 10);
g.fillRoundRect(xStone, yStone - 10, size, size, 10, 10);
}
}
}
if (newGen.getNum() == 0 || newGen.getNum() == 1 || newGen.getNum() == 2) {
g.setColor(Color.RED);
newGen.paintApple(g);
}
好吧，基本上，我在蛇游戏中添加了一些东西，我只是想测试一下我可以增加多少，然后再感到无聊并继续进行项目。
我创建了一个新的对象生成类，该类使我可以创建一个新的计时器，以便我可以以与主游戏类不同的延迟进行更新，以便可以在一定时间后使食物变得绝望。我还想添加石头（如果头部撞到游戏结束），将在达到一定得分+尾巴长度后生成。我生成一个介于（0-3）之间的随机数，并根据我得到的随机数使岩石出现在每一侧。在尝试使其正常工作时，我收到了此大量错误消息，并且我对它的含义或如何解决没有任何线索，因此，如果有人可以给我任何有关解决此问题的提示或想法，请执行。 / p>