Access Modifiers and Static Keyword

Objective:

You will learn different type of access modifiers and their usage.

Topics:

1. Access Modifiers – public, default(package-private), private and protected – What are Access Modifiers, When and How are they used?
2. static keyword – When do we use static keyword in front of variables, methods and inner classes and when we don’t?
3. Rules related to static keyword – static method vs non static method.
4. static initializer block for static variable initialization and constructor for non-static variable initialization.
5. Why is main method static, Why methods in java.lang.Math API static or in general what all methods are static in APIs?