Array
Declare, construct,

Modifier
Access modifier: default, public, protected, private.
Non-access modifier: final, abstract, strictfp.

Inheritance
in java, class can be derived from classes.
Superclass: deriving, induk, class yang diambil.
Subclass: derived, anak, class yang mewarisi.

Polymorphism
Inheritance
Encapsulation
Abstraction
Classes
Objects
Instance
Method
Message Parsing