Java basics

Question 1

Length in bytes/max value for primitive types

Question 2

Meaning of keywords: static, final, transient

Question 3

this’ and ‘super’ keywords

Question 4

Contract between equals() and hashCode()

Question 5

Access modifiers in Java

Question 6

Explain strictfp, volatile, transient

Question 7

What different between StringBuffer and StringBuilder

Question 8

Purpose, types and creation of nested classes

Question 9

What does it mean that an object or a class is mutable or immutable

Question 10

How to make class immutable

Question 11

Besides “string” do you know any other immutable classes

Question 12

Rules to create equals method (stability, transitivity, reflectivity etc)

Question 13

Difference between overriding and overloading

Question 14

How can we replace multi-inheritance pattern in Java

Question 15

Can interface inherit from different interface

Answer 15

Interfaces can inherit from one or more interfaces. The derived interface inherits the members from its base interfaces

Question 16

What is a marker interface

Question 17

Regular vs. static initialization blocks