We share some most frequently and important java interview questions.

Not only are these questions frequently asked by interviewers, but also

that they are essential for you to master core Java.

1. How do you implement your own Key Object for HashMap?

   To answer such as question, you probably should also get familiar with the concept of HashTable. Since HashTable use a hash function to map an object to the index of the underlying Array, you need to implement the hashcode method. As there can be conflicts: Two object generate the same hashcode,