How do you make a HashMap key immutable?

Make HashMap key object immutable Also, this class must honor the hashCode() and equals() methods contract . This is the main reason why immutable classes like String , Integer or other wrapper classes are a good key object candidate.

Show activity on this post. Closed 6 years ago. I want to know whether a particular key is present in a HashMap, so i am using containsKey(key) method. But it is case sensitive ie it does not returns true if there is a key with Name and i am searching for name.

You know keys in the java. util. HashMap are case sensitive . It means you can keep both “abc” and “ABC” as keys in the same map.