Interfaces In Java

Interfaces In Java

• 1.
  Interfaces Presented ByParag Shah http://www.adaptivelearningonline.net
• 2.
  Agenda Java andmultiple inheritance Declaring interfaces Using interfaces
• 3.
  Java And MultipleInheritance - 1 Java does not have multiple inheritance Inheritance gives us two things Code reuse Ability to represent the object polymorphically as the super type
• 4.
  Java And MultipleInheritance - 2 Code reuse in multiple inheritance is risky The ability to represent a class polymorphically as a type other than the superclass may be useful Interfaces allow the latter but not the former
• 5.
  Interfaces Interfaces aredefined with the interface keyword Interfaces do not have any code All attributes are public static final public interface Ignorable { public boolean isValid(); }
• 6.
  Implementing An InterfaceAny class can implement an interface Use the implements keyword A class can implement multiple interfaces The class must implement all the methods declared in the interface See [biz.adaptivesoftware.examples.interfaces]
• 7.
  Marker Interfaces Some interfaces are used as flags for the JVM Cloneable Serializable SingleThreadModel
• 8.
  Summary Interfaces allowus to polymorphically represent a class as types across inheritance trees Interfaces are implemented with the implements keyword Do not CREATE interfaces for non standard use such as marker interfaces