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一、综述所有集合类都位于java.util包下。集合中只能保存对象（保存对象的引用变量）。（数组既可以保存基本类型的数据也可以保存对象）。当我们把一个对象放入集合中后，系统会把所有集合元素都当成Object类的实例进行处理。从JDK1.5以后，这种状态得到了改进：可以使用...

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