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A java keyword used in a class definition to specify that a class is not to be instantiated, but rather inherited by other classes. An abstract class can have abstract methods that are not implemented in the abstract class, but in subclasses.

"abstract class"

A class that contains one or more abstract methods, and therefore can never be instantiated. Abstract classes are defined so that other classes can extend them and make them concrete by implementing the abstract methods.

"abstract method"

A method that has no implentation.

"Abstract Window Toolkit (AWT)"

A collectionof Graphical User Interface (GUI) components that were implemented using native-platform versions of components. These components provide that subset of funtionality which is common to all native platforms. Largely supplanted the Project Swing component Set.

"access control"

The methods by which interactions with resources are limited to collections of users or programs for the purpose of enforcing integrity, confidentiality, or availability constraints.


The acronym for the four properties guaranteed by transactions: atomicity, consistency, isolation, and durability.

"actual parameter list"

The arguments specified in a particular method call.


Application Programming Interface. The specification of how a programmer writing an application accesses the behavior and state of classes and objects.


RA component that typically executes in a Web browser, bit can execute in a variety of other applications or devices that support the applet programming model.


A data item specified in a method call. An argument can be a literal value, a variable, or an expression.


A collection of data items, all of the same type, in which each item's position is uniquely designated by an integer.


American Standard Code for Information Interchange. A standard assignment of 7-bit numeric codes to characters.


Refers to an operation that is never interrupted of left in an incomplete state under any circumstance.


The process by which an entity proves to another entity that it is acting on behalf of a specific identity.


Automatic conversion between reference and primitive types.


A reusable software component that conforms to certain design and naming conventions. The conventions enable beans to be easily combined understand the conventions.

"binary operator"

An operator that has two arguments.


The smallest unit of information in a computer, with a value of either 0 or 1.

"bitwise operator"

An operator that manipulates the bits of one or more of its operands individually and in parallel. Examples include the binary logical operators (&,|,^), the binary shift operators(<<,>>,>>>) and the unary one's complement operator (~).


In the Java programming language, any code between matching braces. Example: { x=1; }.


Refers to an expression or variable that can have only a true or false value. The Java programming language provides the boolean type and the literal values true and false.


A Java keyword used to resume program execution at the statement immediately following the currecnt statement. If followed by a label, the program resumes execution at the labeled statement.


A sequence of eight bits. Java provides a corresponding byte type.


Machine-independent code generated by the Java compiler and executed by the Java interpreter.


A Java keyword that defines a group of statements to begin executing if a value specified matches the value defined by a preceding switch keyword.


Explicit conversion from one data type to another.


A Java keyword used to declare a block of statements to be executed in the event that a Java exception, or run time error, occurs in preceding try block.


A Java keyword used to declare a variable of type character.


In the Java programming language, a type that defines the implementation of a particular kind of object. A class definition defines instance and class variables and methods, as well as specifying the interfaces the class implements and the immediate superclass of the class. If the superclass is not explicitly specified, the superclass will implicitly be Object.