JAVA 集合框架
数组可以存储很多一样类型数据的目标，可以直接使用下标来存取其间的元素，效率高。但数组大小是固定的。java.util包中的Arrays类，提供了一组static方法，终结数组的填充、仿制、比较、搜索等功能。(Arrays can store many targets of the same type of data, and can directly use subscripts to access the elements in between, which is highly efficient. But the array size is fixed. java. The Arrays class in the util package provides a set of static methods to complete the filling, copying, comparison, search, and other functions of the array.)
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