int A = 300;
int B = 400;
int C = 1000;
int D = 500;
int []abcd = {A,B,C,D};
Arrays.sort(abcd); // the sequence of array elements will be {300, 400, 500,1000}
int A = 300;
int B = 400;
int C = 1000;
int D =
阅读背景：
如何更改数组元素的值
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