Constructor Overloading Example and Issues
Take the following example: Outputs: James Froggatt Emma NA If we change the Person class to: ...we can see in the second constructor, our firstName is not consistent in both…
Variable Scope
LOCAL VARIABLES & PARAMETER VARIABLES A local variable is a variable declared in the body of a method. A parameter variable(s) is/are declared in the method headers e.g. when the…
Object example to find area of a circle
All circles have the properties of (nouns) radius diameter circumference perimiter area What does the circle do? What can you do with a circle? (Verb) Code Example 1: Run: Radius…
What is an object
Very much like a collection of nouns and verbs. A person can be described as nouns, these in Java are called properties hairColor="blond" height="6" legs="2" jacketColor="Blue" and verbs to describe…
Method Overloading
When you give two or more methods the same name within the same class you are overloading the method name. Overloaded methods have something different in their parameter lists. Java…
ArrayList
Array list: Pink Orange Red Green Blue Array list with colors removed: Pink Orange Green
GUI Basics
All GUI's are composed of GUI components. i.e. menu, scroll bars. Java has all these components built in, you just have to say where to put it and what to…
Inheritence and overriding
Food is the superclass and Cat and Dog are the subclasses, as they inherit all the methods and variables of the food superclass. Example 1) Outputs: I am the eat…
Final
Whenever we add 'final' in front of a variable, it means we can't change the variable under any circumstances. In this example we use an int variable number, but we…
Static variables can be called without object creation
This is how the math functions and constants work. Outputs: Constructor for Emma Smith, members in the club: 1 Constructor for Larry Oldman, members in the club: 2 Constructor for…