Question

I have a hashmap of two objects, but it seems to return different values because the hashcode is different.
Ex.

HashMap<HashMapTest, String> newMap = new HashMap<HashMapTest, String>();
    newMap.put(new HashMapTest("test"), "line");
    System.out.println(newMap.get(new HashMapTest("test")));

the hashcodes are different when I put it in the hashmap and when I get it from the hashmap. Is there any way of fixing this?

Answer 1

Did you provide your custom implementation of the hashCode() method in HashMapTest? I guess not, and that’s the default behavior of hashCode() inherited from java.lang.Object (you are actually using two different objects.) Have a look at this question to provide correct hashCode/equals implementations for your classes.