[LeetCode]Majority Element

Given an array of size n, find the majority element. The majority element is the element that appears more than ? n/2 ? times.

You may assume that the array is non-empty and the majority element always exist in the array.

Credits:
Special thanks to @ts for adding this problem and creating all test cases.

public class Solution {
    public int majorityElement(int[] num) {
        Map map = new HashMap<>();
        for(int i=0;i it = map.keySet().iterator();
        while(it.hasNext()){
        	int val = it.next();
        	if(map.get(val)>num.length/2){
        		return val;
        	}
        }
        return -1;
    }
}