Java's Object Orientation, I/O

CS 161 - Java

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Java Arrays, Objects, Methods

Arrays

• Are themselves first class objects

• Are declared, instantiated, and initialized

• Can be made of any primitive type or Class

• Have an associated field (arrayName.length) that specifies the number of elements the array can hold

Constructors

• Purpose is to guarantee object instances are initialized correctly

• Look sort of like instance methods

• Have same name as class; don't have a return type

• Are "called" using new

Classes - Templates for Objects

Definition: A class is a blueprint or prototype that defines the variables and methods common to all objects of a certain kind.

Objects - Instances of classes

Definition: An object is a software bundle of variables and related methods.

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