Java小问题大虾来帮帮忙
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[待解决问题]
我在课本上抄写了一段代码，运行后出现了
Exception in thread "main" java.lang.NullPointerException
at java.awt.Container.addImpl(Unknown Source)
at java.awt.Container.add(Unknown Source)
at javax.swing.JPopupMenu.add(Unknown Source)
at javax.swing.JMenu.add(Unknown Source)
at SnakeFrame.init(SnakeGame.java:345)
at SnakeFrame.<init>(SnakeGame.java:257)
at SnakeGame.main(SnakeGame.java:21)
错误，大侠帮我看看怎么解决啊，急急急，小弟感激不尽。
所有回答(2)
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main函数中出现NullPointerException（空指针）错误，
at java.awt.Container.addImpl(Unknown Source)
at java.awt.Container.add(Unknown Source)
at javax.swing.JPopupMenu.add(Unknown Source)
at javax.swing.JMenu.add(Unknown Source)
at SnakeFrame.init(SnakeGame.java:345)
at SnakeFrame.<init>(SnakeGame.java:257)
at SnakeGame.main(SnakeGame.java:21)
这个at后面的是地址，at java.awt.Container.addImpl(Unknown Source)
at java.awt.Container.add(Unknown Source)
at javax.swing.JPopupMenu.add(Unknown Source)
at javax.swing.JMenu.add(Unknown Source)这几个是找不到资源，可能是引用错误。
at SnakeFrame.init(SnakeGame.java:345)
at SnakeFrame.<init>(SnakeGame.java:257)
at SnakeGame.main(SnakeGame.java:21)
这三个你可以点进去看看，然后找到问题所在，想数组越界等。
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能发下你抄的是什么代码吗，这个错误很广泛
