Class with instance variables and constructors

gistfile1.java

public class Car{
	
	/* these are instance variables, they are defined outside of any function which means that any
	   function in the class can access them.  Since they are private ONLY functions in the class 
	   can access them. However note that the String is not set to anything, trying to access it 
	   would throw an error. 
	*/
	private String color;
	private int doors;
	
	//this is a default constructor, it has no arguments
	public Car(){
		//now we set the car variable to something generic now its instantiated and we can access it
		this.color = "";	
	}
	
	//this is a full constructor, both of the class variables are passed in
	public Car(String color, int doors){
		//we use the this keyword to refer to the class variable, the color on the right 
		//side is the value of the arguments
		this.color = color;  
		this.doors = doors;
	}
	
	/* these are called getters and setters, or accessors and mutators
	   they are public methods to get and set the class variables.  the reason
	   is that we can check the values when setting or getting */
	public String getColor(){
		return this.color;
	}
	
	public void setColor(String color){
		//lets say we dont like yellow cars we can ignore yello cars
		if(!color.equals("yellow")){
			this.color = color;	
		}
	}
}