Greenfoot Ch 4 Practice

A constructor must be called to create an object

Common characteristics of a constructor’s signature

This is a valid constructor public  void AnimalWorld()     {            // Create a new world with 400x300 cells         // with a cell size of 1x1 pixels.         super(400, 300, 1);     }

This is a valid constructor public Elephant()     {         imageDown = new GreenfootImage("elephant.png");         imageUp = new GreenfootImage("elephant2.png");         setImage(imageDown);     }

Given the following constructor, what is the correct way to add an elephant object from this constructor at coordinates, 50,50? public Elephant()     {         imageDown = new GreenfootImage("elephant.png");         imageUp = new GreenfootImage("elephant2.png");         setImage(imageDown);     }

An instance variable is sometimes called a ________

You may not be accessed directly by any code outside the class (can’t get to it with the ‘.’)  and is not inherited by subclasses.

It may not be accessed directly by any code outside the class (can’t get to it with the ‘.’) and it is inherited by subclasses.

It may be accessed directly by any code outside the class and it is inherited by subclasses.

Constructors are sometimes used to initialize instance variables – especially if they represent objects.

Attempt to always use local variables except when the variable exhibits a natural “has-a” relationship to the object For Example:  A car has a make, model, type, color