java 基本排序

      int[] arr={5,4,2,4,9,1};           //选择排序        for (int i = 0; i < arr.length-1; i++) {            for (int j = i+1; j < arr.length; j++) {                if(arr[i]>arr[j]) {                    int temp=arr[i];                    arr[i]=arr[j];                    arr[j]=temp;                }            }        }

//冒泡排序                for (int i = 0; i < arr.length-1; i++) {                    for (int j =0; j < arr.length-1-i; j++) {                        if(arr[j]>arr[j+1]) {                            int temp=arr[j];                            arr[j]=arr[j+1];                            arr[j+1]=temp;                        }                    }                }