冒泡排序

public class Test {
    public static void main(String[] args) {
        int[] arr = {1,2,3,2,1,5,7,2,3};
        int temp;
        for (int i = 0; i < arr.length-1; i++) {
            boolean flag=false;
            for (int j = 0; j < arr.length-i-1; j++) {
                if (arr[j]>arr[j+1]){
                    temp=arr[j];
                    arr[j]=arr[j+1];
                    arr[j+1]=temp;
                    flag=true;
                }
            }
            if (!flag){
                System.out.println("1");
                break;
            }
        }
        System.out.println(Arrays.toString(arr));

    }
}