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Java is a statically typed language, it does not allow to change variable's data type: once declared, they cannot be changed. There are two major categories of data types in Java: Primitive data types and Non-primitive data types.

Null checks in programs are often overlooked by programmers causing serious bugs in program's code leading to NullPointerExceptions. Java 8 introduces a new class called Optional, a container that either contains a value or "empty".

This series covers Object Oriented Programming (OOP) in Java with example. Learn about Abstraction, Encapsulation, Inheritance, Polymorphism, also about Association, Aggregation, and Composition in this series