Java Quick Reference - Overloading, Overriding, Runtime Types and Object Orientation

Language Fundamentals

Operators and Assignments

Flow Control and Exceptions

Declarations and Access Control

Garbage Collection

Overloading and Overriding

Threads

The java.lang Package

The java.util Package

The java.awt Package

The java.io Package

References

Miscellaneous Notes

Tips & Traps

Mock Exams

Overloading, Overriding, Runtime Types and Object Orientation - Top-level Classes

a top-level class can be declared public, final or abstract
or it can have no access modifier which defaults to package or friendly access

    public class TestTopLevel {}
    final  class FinalClass {}
    abstract class AbstractClass {}
    class PackageClass {}

you can have more than one top-level class in a source code file; however, you can have only one public class in a source code file

	Encapsulation	Polymorphism	isA/hasA	Overloading	Overriding	Field Variables
	Initialization	Top-level Classes	Inner Classes	Static Nested Classes	Local Classes	Anonymous Classes