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课堂收获

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int[] ns = new int[5]

1.定义数组,int[] 整形数组

2.访问数组,从0开始

3.数组和字符都是引用类型,int,float指得是普通类型

4.引用类型可以看成指针,指向一个内存空间,可以任意变动所指的内存空间


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