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冒泡排序代码： //注意：目的是优化代码 //1、内循环次数: j < arr.length-1-i; //2、两轮for循环中间设置boolean flag = true; public class BubbleSortText { public static void main(String[] args) { int[] arr = {5,1,2,3,4}; for (int i = 0; i < arr.length-1; i++) { boolean