All GraphicObjects must be able to draw or resize themselves they just differ in how they do it. Others require different implementations (for example, resize or draw). Some of these states and behaviors are the same for all graphic objects (for example: position, fill color, and moveTo). These objects all have certain states (for example: position, orientation, line color, fill color) and behaviors (for example: moveTo, rotate, resize, draw) in common. In an object-oriented drawing application, you can draw circles, rectangles, lines, Bezier curves, and many other graphic objects. Note that many software libraries use both abstract classes and interfaces the HashMap class implements several interfaces and also extends the abstract class AbstractMap. In addition, the Map interface has been enhanced with many default methods such as merge and forEach that older classes that have implemented this interface do not have to define. Serializable Objects), and has the functionality of a map. By reading this list of interfaces, you can infer that an instance of HashMap (regardless of the developer or company who implemented the class) can be cloned, is serializable (which means that it can be converted into a byte stream HashMap, which implements the interfaces Serializable, Cloneable, and Map. Its subclasses (which include HashMap, TreeMap, and ConcurrentHashMap) share many methods (including get, put, isEmpty, containsKey, and containsValue) that AbstractMap defines.Īn example of a class in the JDK that implements several interfaces is
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