java 随机打乱数组

Posted 2021-05-07

public static int[] myShuffle(int [] num){
	    if(num==null || num.length==0) return new int[num.length];
	    Random random = new Random();
	    for(int k = 0; k < num.length; k++){
	        int s_num = random.nextInt(num.length-k)+k;
	        swap(num,k,s_num);
	    }
	    return num;
	}
	public static void swap(int [] x,int t,int i) {
		int temp = x[i];
		x[i] = x[t];
		x[t]=temp;
	}