MajorityElement169.java

import java.util.HashMap;
import java.util.Map;

public class MajorityElement169 {
    private static Map<Integer, Integer> countNums(int[] nums){
        Map<Integer, Integer> counts = new HashMap<Integer, Integer>();
        for (int num : nums) {
            if (!counts.containsKey(num)) {
                counts.put(num, 1);
            }else{
                counts.put(num, counts.get(num)+1);
            }
        }
        return counts;
    }
    public static int majorityElement1(int[] nums) {
        Map<Integer, Integer> counts = countNums(nums);
        Map.Entry<Integer,Integer> majorityEntry = null;
        for (Map.Entry<Integer,Integer> entry : counts.entrySet()) {
            if (majorityEntry == null || entry.getValue() > majorityEntry.getValue()) {
                majorityEntry = entry;
            }
        }
        return majorityEntry.getKey();
    }
    public static void main(String[] args) {
        int[] nums = {2,2,1,1,1,2,2};
        int n = majorityElement1(nums);
        System.out.println(n);
    }
}