Boxed value is unboxed and then immediately reboxed （装箱的值被拆箱又重新装箱）
FindBugs常见错误：[BX_UNBOXING_IMMEDIATELY_REBOXED] Boxed value is unboxed and then immediately reboxed；
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解决警告：Boxed value is unboxed and then immediately reboxed
使用场景： 在Java中，自动装箱（auto-boxing）和自动拆箱（auto-unboxing）是两个常
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