Object Oriented Programming - Midterm 1 Terms

Object

a member of a Java class, with its own identity, behaviour, and state

Enum:

A datatype when an objects Structure or state can only have one of a small set of values

Packages

-A namespace that organizes a set of related classes and interfaces

-“different folders on your computer”

Access modifiers of a class

Public, default private

default Class Access modifier:

accessible only within the same package

private Class Access modifier:

modifiers only apply to nested classes

Access modifiers for class members:

Public default private protected

public class member access modifier

accessible from everywhere in the program

default class member access modifier:

accessible only within the same package

private class member access modifier

accessible only within the class in which they are declared

protected class member access modifier:

accessible within the same package or subclasses in different packages

encapsulation

-Wrapping the variables and code acting on the methods together as a single unit

-variables of a class will be hidden from other classes and can be accessed only though the methods of their current class

To achieve encapsulation in Java:

-declare the variables of a class as private

-provide public setter and getter methods to modify and view the variables values

This keyword

-refers to the current object in a method

-eliminates the confusion between class attributes and parameters with the same name constructors

Class

-when defined in java, it is usually a new data type
-Used to make multiple objects, defined by its properties