请问下面的语句是什么意思呀？
Exception in Thread "main" java.lang.NullPointerException Exception in Thread "main" jav
Exception in Thread "main" java.lang.NullPointerException Exception in Thread "main" jav
阅读背景：
Exception in Thread "main" java.lang.NullPointerException运行出错这是什么东东呀？？
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