Using Objects

Procedural abstraction

________: not knowing how a method or thing was written but still using it effectively in programs as long as you know what it does.

Null

________: when the variable is not pointing to any object or does not allocate or memory.

Wrapper classes

________: converts primitive types to object types in order for methods to work with them.

Concatenation

________: the process of adding 2 string values together.

Void

________: return type, indicates what type of value is being returned from the method, indicates that the method doesnt return anything for this type.

Public Rectangle

________: example of constructor name, must match class name.

constructor

A(n) ______ can be written with no formal parameters and instead has predetermined values.

Non-void methods

________ can be stored in another variable or used in an expression.

Public

________: access specifier, determines who has access to use the method when writing classes and objects.

return type

The ________ must match the data type that is being returned from the method.

Name the class; Example

public class Rectangle

public Rectangle

example of constructor name, must match class name

(int rectWidth, int rectHeight)

Formal Parameter list, lists the type of variables that can be passed into that constructor and their variable names, should not be variable names

Procedural abstraction

not knowing how a method or thing was written but still using it effectively in programs as long as you know what it does

Methods

procedures that allow us to control and define the behavior of an object

Public

access specifier, determines who has access to use the method when writing classes and objects

printArea()

method name, named like variables, must be concise

/n

adds a line break

/t

adds a tab space

Wrapper classes

converts primitive types to object types in order for methods to work with them

Auto boxing

primitive type → wrapper class (Integer X = 4;)

Unboxing

wrapper class → primitive type (int x2 = X;)