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2. Abstract Window Toolkit - Wikipedia

   en.wikipedia.org/wiki/Abstract_Window_Toolkit

   The Abstract Window Toolkit (AWT) is Java's original platform-dependent windowing, graphics, and user-interface widget toolkit, preceding Swing. The AWT is part of the Java Foundation Classes (JFC) — the standard API for providing a graphical user interface (GUI) for a Java program. AWT is also the GUI toolkit for a number of Java ME profiles.

3. Abstract type - Wikipedia

   en.wikipedia.org/wiki/Abstract_type

   //By default, all methods in all classes are concrete, unless the abstract keyword is used. public abstract class Demo {// An abstract class may include abstract methods, which have no implementation. public abstract int sum (int x, int y); // An abstract class may also include concrete methods. public int product (int x, int y) {return x * y;}} //By default, all methods in all interfaces are ...

4. Interface (Java) - Wikipedia

   en.wikipedia.org/wiki/Interface_(Java)

   An interface in the Java programming language is an abstract type that is used to declare a behavior that classes must implement. They are similar to protocols.Interfaces are declared using the interface keyword, and may only contain method signature and constant declarations (variable declarations that are declared to be both static and final).

5. Java Foundation Classes - Wikipedia

   en.wikipedia.org/wiki/Java_Foundation_Classes

   The Java Foundation Classes are comparable to the Microsoft Foundation Class Library (MFC). JFC is an extension of the original Java Abstract Windowing Toolkit (AWT). Using JFC and Swing, an additional set of program components, a programmer can write programs that are independent of the windowing system within a particular operating system.

6. Standard Widget Toolkit - Wikipedia

   en.wikipedia.org/wiki/Standard_Widget_Toolkit

   The first Java GUI toolkit was the Abstract Window Toolkit (AWT), introduced with Java Development Kit (JDK) 1.0 as one component of Sun Microsystems' Java platform. The original AWT was a simple Java wrapper library around native (operating system-supplied) widgets such as menus, windows, and buttons.

7. Class (computer programming) - Wikipedia

   en.wikipedia.org/wiki/Class_(computer_programming)

   Before a class derived from an abstract class can be instantiated, all abstract methods of its parent classes must be implemented by some class in the derivation chain. [25] Most object-oriented programming languages allow the programmer to specify which classes are considered abstract and will not allow these to be instantiated. For example ...