The interview process took 2 hours. Only 5-6 core Java questions were asked in the first round. I answered all but one, but was not selected in the first round. The interviewer seemed tired and was not interested in asking questions. They should have asked more questions on different topics or given a chance for the next round. I was disappointed with the result.

Asked core Java questions.

If a method is overloaded in a class in the following way:

java public void fun(Object o) { }

public void fun(ArrayList a) { }

And is invoked in the following manner:

java obj.fun(null)

Which method will be invoked?

Give the internal implementation of the add method of ArrayList.

Sort a Student class on roll number, name, and course.

How will you create an immutable class? Explain the string constant pool and string immutability.

Function overriding with an example.