如何从二维数组（java）中随机获取一对元素

Question

I have the following Array:

arr= new int[][] { { 20, 0 }, { 2, 1 }, { 3, 2 }, { 1, 0 } };

I want getting randomly one lement from arr . For example: [3,2] or [20,0]

I'm using the following code:

Random r=new Random();        
    int rd= rand.nextInt(arr.length);

Answer 1

You can use int[] randomPair = arr[randomNumber]; . If you want to get that numbers in seperated variables, you can add int num1 = randomPair[0];int num2 = randomPair[1];