面试题：数组中出现次数超过一半的数字

import java.util.HashMap;
public class Solution {
    public int MoreThanHalfNum_Solution(int [] array) {
        HashMap<Integer,Integer> map = new HashMap<>();
        for(int i=0;i<array.length;i++){
            Integer key=array[i];
            Integer value=map.get(key);
            if(value!=null){
                map.put(key,value+1);
            }else{
                map.put(key,1);
            }
        }
       for(int i=0;i<array.length;i++){
           int val=map.get(array[i]);
           if(val>array.length/2) return array[i];
       } 
        return 0;
    }
}