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                ``` 集合按照其存儲結構可以分為兩大類,分別是單列集合`java.util.Collection`和雙列集合`java.util.Map` ``` ``` 集合是java中提供的一種容器,可以用來存儲多個數據 ``` ``` 集合和數組既然都是容器,它們有啥區別呢? * 數組的長度是固定的。集合的長度是可變的。 * 數組中存儲的是同一類型的元素,可以存儲基本數據類型值。集合存儲的都是對象。而且對象的類型可以不一致。在開發中一般當對象多的時候,使用集合進行存儲 ```
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