????What 什么是空指针NullPointerException(NPE)空指针是运行时异常,所以就导致在编码时不易发现,因为Java中对象可以设为null,当去使用为null的对象操作时会抛出空指针,NullPointerException 官方解释????NullPointerException is a RuntimeException. In Java, a special null value can be assigned to an object reference. Nul
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2023-09-17
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