数组中有一种数出现了奇数次，其他数都出现了偶数次，找出出现奇数次的数

public class EvenTimesOddNum1 {
    public static void printOddTimesNum1(int[] arr){
        int eor = 0;
        for (int i = 0;i<arr.length;i++){
            eor = eor ^ arr[i];
        }
        System.out.println(eor);
    }

    public static void main(String[] args) {
        int[] arr1 = {1,2,3,2,1,3,2,3,4,3,4};
        printOddTimesNum1(arr1);
    }
}