Method Inheritance Open SmoothMover and Vector. Vector Class Variables Open SmoothMover and Vector.

Polar Representation = length and direction Cartesian Representation = dx and dy The Walker School – Games and Simulations - 2010 Has 2 constructers “Body” with different parameters. This means that the methods (or constructors) have different signatures. Overloading Can have the same name, as long as their parameters are different.

How are these 2 classes different? What classes are inherited from Vector? Why is it not under Actor? The Walker School – Games and Simulations - 2010 Helper (or Support) Classes Some Helper Classes They do not have constructors, so you can’t create instances of them. Helper Classes Also known as Abstract classes. Right click on a planet and inspect its properties. Right-click on Space world at the top? What happens when you activate one of these methods? The Walker School – Games and Simulations - 2010 Because each object does have a size, mass, and velocity, we can use abstraction in programming to create a Body Class that handles each of these items as variables. While each of these varies in size, mass, composition and velocity, they are also similar in many ways.

The main types of bodies in our solar system contains planets, planetoids, moons, asteroids and comets.

What kinds of bodies are in our solar system? Why don’t we see a class for each type? Newton’s Lab Games and Simulations O-O Programming in Java The Walker School The Walker School – Games and Simulations - 2010

Greenfoot gravity