how to compare two hash maps?

Question

How to compare the values in both hash maps with the help of keys ? Since the keys are identical whereas values are\'nt. and return boolean result for each key comparision. like

Answer 1

Assuming that you have the same entry sets:

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

public class HashMapComparison {

    public static void main(String[] args) {

        HashMap map1 = new HashMap();
        map1.put(1, "res");
        map1.put(2, "tr");

        HashMap map2 = new HashMap();
        map2.put(1, "res");
        map2.put(2, "cd");

        for (Entry entry : map1.entrySet()) {
            Integer key = entry.getKey();
            System.out.println("key " + key + ": "
                    + entry.getValue().equals(map2.get(key)));
        }

    }

}