1. Class
Everything if Java is in a class. The class has a constructor that creates the object.
public class ClassName
private Field data (instance variables)
Constructor (method that creates the object)
Methods ( get and set the instance variables and other actions as necessary)

2. Instance Variables
Properties of the object. What it knows about itself. Created in a field so also called field data private String color; private int legs; private String name;
I know my color, how many legs I have and my name.

3. CONSTRUCTOR public className() { Assign instance variables here }
public Bug() {
String color = “red”;
int legs = 6;
String name = “Beetle”; }

4. Parameter ( )
Supplies extra information to a method that it needs to execute. Required for constructors & all methods. public Bug() { public static void main(String[]args) { public void setName(“String name”);

5. Classes create objects from the constructor with the word new
public Bug() {
String color = “red”;
int legs = 6;
String name = “Beetle”; }
Bug b = new Bug();
public Bug(String c, int l, String n) {
color = c;
legs = l;
name = n; }
Bug b = new Bug(“Red”, 6, “Beetle”);
(String, int, String)

6. Methods
Accessor Methods: Access information from our instance variables. Instance variable: name name is a String public String getname() { return name; }

7. Mutator Methods
Change information in our instance variables. Called setters. Instance Variable name public void setName(String n); name = n; } Doesn’t return anything so it is void.

8. Objects call their method with dot operator.
Bug b = new Bug(); // b is the object public void setName(String n); // is the method b.setName(“Harry”); System.out.println(b.getname()); prints Harry