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什么是Java的Wrapper包装类?请举例说明其用途和使用方法。
Java的Wrapper包装类是一组类,它们将基本数据类型(如int、char、boolean等)包装为对象。Wrapper类提供了一些特殊的功能和方法,可以使基本数据类型像对象一样操作。它们位于java.lang包下,并分别对应着基本数据类型:Integer、Long、Double、Float、Short、Byte、Character ...
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