With concrete or abstract classes, inner classes are the only way to produce the effect : Inner Class « Class « Java

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Java » Class » Inner Class Screenshots  With concrete or abstract classes, inner classes are the only way to produce the effect   // : c08:MultiImplementation.java // With concrete or abstract classes, inner classes are the only way to produce the effect // of "multiple implementation inheritance." // From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002 // www.BruceEckel.com. See copyright notice in CopyRight.txt. class D { } abstract class E { } class Z extends D {   E makeE() {     return new E() {     };   } } public class MultiImplementation {   static void takesD(D d) {   }   static void takesE(E e) {   }   public static void main(String[] args) {     Z z = new Z();     takesD(z);     takesE(z.makeE());   } } ///:~                          Related examples in the same category 1.  Nested classes can access all members of all levels of the classes they are nested within 2.  Creating inner classes 3.  Creating instances of inner classes 4.  Returning a reference to an inner class 5.  Nesting a class within a scope 6.  Putting test code in a nested class 7.  Inheriting an inner class 8.  Creating a constructor for an anonymous inner class 9.  This file is to show what happens if you try to access an inner class created in another class 10.  Demonstrate an Inner Child class 11.  Demonstrate simple inner class 12.  Just to show that there is no such thing as inner methods in Java 13.  A named inner class is used to 14.  An inner class cannot be overriden like a method 15.  Proper inheritance of an inner class 16.  Using inner classes for callbacks 17.  Holds a sequence of Objects 18.  Nested Class Static 19.  Static Inner Class 20.  Compiler will generate a synthetic constructor since SyntheticConstructor() is private 21.  Accessing its enclosing instance from an inner class