Question

How to find the key associated with max value in HashMap with Java

Answer 1

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

public class MyClass {
    public static void main(String args[]) {
        HashMap<Integer,Integer> hmap = new HashMap<Integer, Integer>();
        hmap.put(1, 45);
        hmap.put(2, 75);
        hmap.put(3, 98);
        hmap.put(4, 30);
        hmap.put(5, 81);
        hmap.put(5, 95);
        
        int maxValue = Collections.max(hmap.values()); 

        for (Map.Entry<Integer, Integer> entry : hmap.entrySet()) { 
            if (entry.getValue() == maxValue) {
                System.out.println(entry.getKey()); 
                break;
            }
        }
    }
}



/*
run:

3

*/

 

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