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Greenfoot
| Term | Definition |
|---|---|
| Object orientation | a programming paradigm that represents concepts as objects that have attributes and methods |
| Syntax | term used to describe the symbols and words that form a programming statement |
| Code | term used to refer to one or more programming statements or programs |
| Scenario | term used to define the objects, the world, and the programming rules for a graphical program created in Greenfoot |
| World | the area in which objects interact |
| Class(Greenfoot) | contains the specifications that define the appearance and movement of an object |
| Instances | the objects from a class that act in the scenario |
| Superclass | used to describe the overarching class of a group of classes; parent class |
| Subclass | a specialization of a class; child class |
| Inheritance | a mechanism wherein a new class is derived from an existing class |
| Source code | a collection a instructions written in a higher-level language(Java) |
| Inherited method | subprogram derived from a superclass |
| Class Description | set of comments to explain the program, includes author and date of last modification |
| Class Definition | source code that includes class name, instance variables, constructors and methods |
| Constructor | special type of method with instructions on how to create an object |
| Method Signature(heading) | contains a return type, method name and parameter list of formal parameters |
| Method name | usually a verb that describes what the method does |
| Return type | indicates what kind of data will be sent from the method |
| Parameters | list that allows values to be passed in to a method |
| Comments | notes to yourself or others to clarify what is happening at that point in the code |
| Documentation | describes the property of a class |
| Method | set of programmed operations or tasks that instances of a class can perform sometimes used to alter data |
| Method call/invocation | name of method with actual parameters that cause execution of the code in the body of the method |
| Method body | the open and close curly braces and the code between them |
| Sequential execution | carrying out instructions in the order they are written |
| Syntax Error | mistake in the grammatical structure of the code or expression that causes code to not compile |
| Argument | a value passed on through a parameter |
| Formal parameters | located in the method signature(heading) consist of data type and a name for the value being passed to be used in the method body |
| Actual parameters | located in the method call; can be literal value, variable, or return method call |
| Literal value | notation for indicating a fixed value in source code |
| Data type | particular kind of value for a variable, parameter, or return |
| Primitive data type | supplied by Java; reserved word; stores one value at a time |
| Object | instance of a class with state(instance variables) and behaviors(methods) |
| Anonymous object | is constructed without creating a name associated with it |
| Named object | is constructed with a name or in a collection to allow access to instance variables and methods |
| Syntax | set of grammatical rules defining how Java is written and interpreted |
| Block | group of zero or more statements between curly braces |
| Instance variable | every object has it's own copy of the variable; Changes made to the variable don't reflect in other objects of that class; field |
| Class variable | one copy of that variable that is shared with all instances of that class. If changes are made to that variable, all other instances will see the effect of the changes; static variable |
| Class method | require the use of the class name when being called outside of the class. |
| Object method | require the use of the class name when being called outside of the class. |
| Constant | a value that is fixed and does not change in a program; defined with keyword final |
| Collection | object that groups several elements into a single unit |
| int | keyword for primitive type used to indicate a variable can store an integer; no decimal |
| boolean | keyword for primitive type used to indicate a variable can store one of two values; true or false |
| char | keyword for primitive type used to indicate a variable can store a single character; uses ' ' |
| double | keyword for primitive type used to indicate a variable can store floating point value representing a real number or fraction; has decimal |
| String | an object that represents text, i.e. a string of characters; uses " " |
| Variable declaration | giving a variable a name and data type |
| Event | an action, such as a mouse-click, to which a program may respond |
| Exception | an occurrence of an unexpected or error condition within a program |
| Expression | computes a value using literals, variables, constants and/or operators |
| final | modifier used to declare a constant |
| import | keyword used to declare a Java package that is used by the current program |
| initialize | to assign a variable a starting value |
| instantiate | the act of creating or constructing an object using the new keyword |
| Local variable | declared within a method definition or other block of statements |
| Loop | a kind of control flow statement that allows repeating a block of statements |
| null | a special value used when no object is assign to a variable |
| operator | a function that works on one or two values to produce a new value |
| private | a keyword used to declare that a method, variable or class may not be accessed directly by other objects and programs. |
| public | a keyword used to declare that a method, variable or class may be accessed directly by other objects and programs. |
| Return value | the final result of invoking a method; needs to be stored, used as part of an expression or sent through a parameter list. |
| statement | a complete instruction that is part of a program |
| Logic error | an error that causes a program to run incorrectly, but not crash. |
| Run-time error | an error that cause a program to crash. |
| Control structure | block of programming that analyzes variables and chooses a direction in which to go based on conditions |
| void | keyword used to declare that a method does not return a value |
| Template | a pre-written program(or part of a program to be used as a starting point for writing new programs or methods |
| Pixel | one dot on computer display; picture element |
| super() | calls the constructor of the parent class |
| overriding | providing multiple signatures for the same method |
| overloading | the act of providing a different implementation of a method inherited from a base type |
| super. | used to class a method of the parent class |
| static variable | one copy of that variable that is shared with all instances of that class. If changes are made to that variable, all other instances will see the effect of the change ; class variable |
| Keyword | reserved by the Java language; cannot be used for method names or variables |
| Object class | parent of all classes in Java |
| Defining a variable | giving a variable a name, data type and value; declaring and initializing at the same time |
| Scope | where a variable can be seen and used in program |
| Access modifier | keyword that changes the scope of a variable or method |
| Static modifier | keyword that changes the way methods or variables or accessed |
| modifier | keyword that changes the meaning of a definition about scope or access of a variable or method |
| casting | the process of temporarily changing the data type of a variable, literal, method return or expression |
| default modifier | sets scope to within the package |
| public modifier | sets scope to everywhere |
| private modifier | sets scope to the class |
| protected modifier | sets scope to class and sub-classes |
Created by:
shoemaker
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