A Summary of Classes in Java.

My Quick Summary of Classes

1.A class is an abstract concept.

a.Other Descriptions

i.A class is a blueprint.

ii.A class understands a course of items.

b.Examples

i.A Radio is a menage of items.

ii.A Student is a category of items.

iii.A Ball is a category of items.

2.An goal is the embodiment of a class.

a.Other Descriptions

i.An object is an instance of a class.

ii.An object is an actual item. It exists.

b.Examples

i.The radio in your room is an object of the Radio class. It exists.

ii.You are an object of the Student class.

iii.The ball the basketball game team uses in an object of the Ball class.

3.A class consists of two basic things:

a.Instance Data (the NOUNS)

i.Other Descriptions

1.Instance selective information represents the state of an object.

2.Instance data represents the attributes of an object.

3.Instance data represents the characteristics of an object.

ii.Examples

1.A volume dial and tuner are attributes of a Radio.

2.A visit and GPA are attributes of a Student.

3.Size and color are the attributes of a Ball.

iii.Visibility of Instance Data

1.Instance Data represents private information.

2.Clients should not be up to(p) to modify private information.

3.Variables should be private.

4.Constants stand be every public or private. (Why?)

b.Methods (the VERBS)

i.Other Descriptions

1.Methods represent the behavior or an object.

2.



Methods represent the services an object quarter provide.

3.Methods represent the things an object rear end do.

ii.Examples

1.A Radio can change volume. A Radio can change the station.

2.A Student can tell you his/her GPA.

3.A Ball can bounce. A Ball can roll.

iii.Three Basic Categories of Methods

1.Constructors (SAME name as class and NO return type)

a.Initialize instance data

b.Create an object

2.Accessors

a.Access information most an object.

b.Do NOT change the instance data.

3.Mutators

a.Modify the object.

b.DO change the instance...

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