冒泡排序

public class BubbleSort{
    public static void main(String[] args){
        int[] arr = {6,4,2,5,7,9,1};
        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 tmp = arr[j];
                    arr[j] = arr[j+1];
                    arr[j+1] = tmp;
                }
            }
        }
}