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submit web page to search engine submit web page to search engine An is a method that is declared without an implementation (without braces, and followed by a semicolon), like this: abstract void moveTo(double deltaX, double deltaY); If a class includes abstract methods, the class itself , as in: public abstract class GraphicObject { // declare fields // declare non-abstract methods abstract void draw(); } When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class. However, if it does not, the subclass must also be declared . All of the methods in an (see the modifier is not used with interface methods (it could be—it's just not necessary). Unlike interfaces, abstract classes can contain fields that are not and , and they can contain implemented methods. Such abstract classes are similar to interfaces, except that they provide a partial implementation, leaving it to subclasses to complete the implementation.

submit web page to search engine If an abstract class contains abstract method declarations, it should be declared as an interface instead. Multiple interfaces can be implemented by classes anywhere in the class hierarchy, whether or not they are related to one another in any way. Think of , for example. By comparison, abstract classes are most commonly subclassed to share pieces of implementation. A single abstract class is subclassed by similar classes that have a lot in common (the implemented parts of the abstract class), but also have some differences (the abstract methods).

submit web page to search engine In an object-oriented drawing application, you can draw circles, rectangles, lines, Bezier curves, and many other graphic objects. These objects all have certain states (for example: position, orientation, line color, fill color) and behaviors (for example: moveTo, rotate, resize, draw) in common. Some of these states and behaviors are the same for all graphic objects—for example: position, fill color, and moveTo. Others require different implementations—for example, resize or draw. All s must know how to draw or resize themselves; they just differ in how they do it.

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