Greenfoot Vocabulary

Any member of a Java Class.

• Actor

• Object

• Abstract classes

• Variables

This defines what objects are in Greenfoot.

• Variabes

• Images

• Methods

• Classes

The name given to an action that has been programmed into an object.

• function
• variable
• method
• class

This specifies what a method call will return.

• Output type
• Return value
• Return type
• Method signature

A return value that can only have two values: True or False.

• integer
• string
• float
• boolean

Used when a method does not return a value.

• int method
• string method
• float method
• void method

A return value that stores a whole number.

• integer
• string
• boolean
• float

A variable that exists for the duration of the method.

• Instance

• Static

• Parameter

• Variable

Any object that exists in a Greenfoot world.

• A sound effect used in a Greenfoot project.
• An actor or object in a Greenfoot world.
• A character in a video game.
• A background image in a Greenfoot world.

A method that is called to give actors a chance to perform some action.

• perform()

• respond()

• act()

• execute()