Introduction to Programming with Greenfoot: Object-Oriented by Michael Kölling

By Michael Kölling

Introduction to Programming with Greenfoot: Object-Oriented Programming in Java with video games and Simulations is perfect for introductory classes in Java Programming or creation to desktop Science.

The merely textbook to educate Java programming utilizing Greenfoot—this is “Serious Fun.”

Programming doesn’t must be dry and dull. This publication teaches Java programming in an interactive and fascinating method that's technically correct, pedagogically sound, and hugely motivational for college kids. utilizing the Greenfoot atmosphere, and an intensive number of compelling instance tasks, scholars are given a different, graphical framework during which to benefit programming.

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Extra info for Introduction to Programming with Greenfoot: Object-Oriented Programming in Java with Games and Simulations

Example text

When the method is defined in another class, we need to specify the class or object that has the method, followed by a period (dot), followed by the method name and parameter. ” in front of the method call. 28 | Chapter 3 Concept: Methods that belong to classes (as opposed to objects) are marked with the keyword static in their signature. They are also called class methods. ■ Improving the Crab—more sophisticated programming Note: Static methods Methods may belong to objects or classes. method-name (parameters); to call the method.

Should be able to control the crab with the keyboard, while the lobsters continue to run randomly by themselves, as they already do. The Greenfoot environment has a method that lets us check whether a key on the keyboard has been pressed. 1, it is a method in the Greenfoot class. The method signature is static boolean isKeyDown(String key) We can see that the method is static (it is a class method) and the return type is boolean. This means that the method returns either true or false, and can be used as a condition in an if-statement.

Each method signature starts with a return type and is followed by the method name and the parameter list. Below it, we see a comment describing what the method does. We can see that the three method names are atWorldEdge, move, and turn. The move and turn methods are the ones we used in the previous sections. If we look at their parameter lists, we can see what we observed before: move has no parameters (the parentheses are empty), and turn expects one parameter of type int (a whole number) for the angle.

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