- abstract class.
-
An abstract class is
- abstract method.
-
An abstract method is
- abstraction.
-
A technique for handling complexity by hiding details and exposing only the high level concept. Abstraction is a key concept in object oriented programming.
- ASCII.
-
American Standard Code for Information Interchange
- base class.
-
Also called a superclass
- constructor.
-
A constructor is ...
- derived class.
-
Also called a subclass
- DoodlePad.
-
DoodlePad is an open source, precompiled Java library of interactive Java Shape classes. DoodlePad is built on Java Swing, and is designed as a learning tool. A key feature of DoodlePad is that the standard AWT/Swing infrastructure is unnecessary. DoodlePad automatically bootstraps and necessary infrastructure to create a fully functioning Swing program with as little as a Shape class instantiation. Custom methods may be invoked automatically when interacting with Shape objects. Linking a Shape with a custom method is accomplished with method references, not by implementing the required Swing interfaces. Interfaces is a topic that is not covered until the end of a standard CS1 progression. (See
DoodlePad 1 ).
- double.
-
A Java primitive floating-point number stored in 8 bytes of memory (64 bits), of which 52 bit are used to store the mantissa, 11 bits are used to store the exponent, and 1 bit is reserved for sign. A double can store up to 16 significant digits.
- dynamic binding.
-
When a method of a derived class is invoked at runtime using a variable of type base class.
- encapsulation.
-
The grouping of related data and behavior in a single computational unit. Encapsulation is a key concept in object oriented programming.
- extends.
-
The Java keyword use to establish an inheritance relationship between two classes.
- float.
-
A Java primitive floating-point number stored in 4 bytes of memory (32 bits), of which 23 bits are used to store the mantissa, 8 bits are used to store the exponent, and 1 bit is reseved for sign. A float can store up to 8 significant digits.
- Garbage Collection.
-
...
- inheritance.
-
A relationship between two classes where one class may access the members of another class
- instanceof.
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The operator used to test of an object is the type of a class or one if its inherited base classes.
- Java.
-
The Java Programming Language is ...
- JDK.
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The Java Development Kit (JDK) is ...
- JRE.
-
The Java Runtime Environment (JRE) is ...
- JShell.
-
The Java Shell tool (JShell) is an interactive console for executing snippets using the Java programming language. When started in verbose mode, JShelll will evaluate Java code snippets and print the result as well as the result type.
- JVM.
-
The Java virtual machine (JVM) is an abstract computing machine that executes instructions from a well-defined standardized low-level instruction set. The JVM has been ported to a variety of computing platforms to abstract away platform-specific details making it possible to run the identical compiled Java and other JVM-based programs across platforms.
- method signature.
-
A method signature is a combination of the name of a method and an ordered list of parameter types. A method signature must be unique. It is used by the Java compiler to bind a method invocation within a program with the correct method declaration.
- nullary constructor.
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A constructor having no parameters
- Object.
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The class inherited by all Java classes.
- object oriented programming.
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A style of computer programming that focusses on the design and use of objects. It it characterized by several principles, including encapsulation and polymorphism.
- overload.
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To define two or more methods in a class with a common name but a different signatures
- override.
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To define a method in a derived class having the same signature as a method in one of its base classes.
- PEMDAS.
-
An acronym for "parentheses, exponents, multiplication, division, addition, subtraction." Indicats the order in which operations are performed when evaluating a mathematical expression.
- polymorphism.
-
A key concept in object oriented programming where one item may have many forms.
- protected.
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Visibility modifier allowing access only from a derived class.
- scope.
-
Scope of an item is the area within which the item (potentially) exists. If you can precede an item with a name (like package, class, or object) and a dot-operator to access it, then it has that scope. If the scope of an item does not exist, all items declared with that scope also do not exist. Scope is different than visibility. An item may be scoped to an object but visible and accessible from outside the scope of the object if declared public.
- shadowing.
-
When a variable declared in a local scope has the same name as a variable declared in an outer scope
- String.
-
A class provided by Java that encapsulates a sequence of characters.
- super.
-
Keyword use to set base class scope
- signature.
-
A method’s unique name and the number, type and order of its parameters.
- UNICODE.
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An international standard for encoding characters that make up in most of the world’s writing systems
- visibility.
-
The visibility of an item determines from where in a program an item may be accessed. Visibility is different than scope. An item may be scoped to an object but visible and accessible from outside the scope of the object if declared public.
