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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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