Array to String (java)

int[] nums = {2,3,4};
//通过 Arrays.toString(nums) 转换成 string 后，存储格式为[2, 3, 4]
String num = Arrays.toString(nums);

下面看看 codingBat一道题：
Given an array of ints, return true if the array contains a 2 next to a 2 or a 4 next to a 4, but not both.
either24([1, 2, 2]) → trueeither24([4, 4, 1]) → trueeither24([4, 4, 1, 2, 2]) → false

Solution:

public boolean either24(int[] nums) {
  String num = Arrays.toString(nums);
  if((num.contains("2, 2") && !num.contains("4, 4")) || 
  (!num.contains("2, 2") && num.contains("4, 4"))) {
    return true;
  }
  return false;
}