Programmer's Guide to Java Certification

Basics of Java Programming

Supplementary Objectives Introduce the basic terminology and concepts in object-oriented programming: classes, objects, references, fields, methods, members, inheritance, aggregation.Identify the essential elements of a Java application read more

Introduction

Before embarking on the road to Java programmer certification, it is important to understand the basic terminology and concepts in object-oriented programming (OOP). read more

Classes

One of the fundamental ways in which we handle complexity is abstractions. An abstraction denotes the essential properties and behaviors of an object that differentiate. read more

Objects

Class Instantiation The process of creating objects from a class is called instantiation. An object is an instance of a class. read more

Instance Members

Each object created will have its own copies of the fields defined in its class. The fields of an object are called instance variables. read more

Static Members

In some cases, certain members should only belong to the class, and not be part of any object created from the class. read more

Inheritance

There are two fundamental mechanisms for building new classes from existing ones: inheritance and aggregation. read more

Aggregation

When building new classes from existing classes using aggregation, a composite object is built from other constituent objects that are its parts. read more

Tenets of Java

Code in Java must be encapsulated in classes.There are two kinds of values in Java: object references and atomic values of primitive types. read more

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Review Questions 1.1 Which statement is true about a method? Select the one correct answer. read more

Java Programs

A Java program is a collection of one or more classes, with one of them containing the program's execution starting point. A Java source file read more

Sample Java Application

An application is what is normally called a program: source code that is compiled and directly executed. In order to create an application in Java,... read more