How can I compare two hashmaps to see if the keys are equal?

Hami :

I have two hashmaps let's say hashmap1 and hashmap2 so that hashmap2 contains common keys with hashmap1. So, I want to check that if the keys are common or equal in both hashmaps, then I multiply the values of hashmap2 by 2 in each iteration.

My code is as follows but it gives me zero. Actually, I want to practice the operation otherwise I can easily multiply the values of hashmap2 without comparing with hashmap1.

double mult=2;
        for(String s:hashmap1.keySet()) {


            if(hashmap1.keySet()==hashmap2.keySet()) {

                mult= mult * hashmap1.get(s);
            }else {
                continue;
                }

            }

        System.out.println("The new values for hashmap2: " + mult);

Moreover, the keys for hashmaps are String

vigneshwaran m :

Hope the below code resolve your issue

Map<String, Integer> hashMap1 = new HashMap<>();
    hashMap1.put("A", 2);
    hashMap1.put("B", 3);

    Map<String, Integer> hashMap2 = new HashMap<>();
    hashMap2.put("A", 2);
    hashMap2.put("B", 3);
    hashMap2.put("C", 4);

    for (Entry<String, Integer> entryHashMap2 : hashMap2.entrySet()) {
        if (hashMap1.containsKey(entryHashMap2.getKey())) {
        System.out.println(entryHashMap2.getValue() * 2);
        hashMap2.put(entryHashMap2.getKey(), (entryHashMap2.getValue() * 2));
        }
    }