Proper inheritance of an inner class : Inner Class « Class « Java

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Java » Class » Inner ClassScreenshots 
Proper inheritance of an inner class
Proper inheritance of an inner class
 

// : c08:BigEgg2.java
// Proper inheritance of an inner class.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

class Egg2 {
  protected class Yolk {
    public Yolk() {
      System.out.println("Egg2.Yolk()");
    }

    public void f() {
      System.out.println("Egg2.Yolk.f()");
    }
  }

  private Yolk y = new Yolk();

  public Egg2() {
    System.out.println("New Egg2()");
  }

  public void insertYolk(Yolk yy) {
    y = yy;
  }

  public void g() {
    y.f();
  }
}

public class BigEgg2 extends Egg2 {

  public class Yolk extends Egg2.Yolk {
    public Yolk() {
      System.out.println("BigEgg2.Yolk()");
    }

    public void f() {
      System.out.println("BigEgg2.Yolk.f()");
    }
  }

  public BigEgg2() {
    insertYolk(new Yolk());
  }

  public static void main(String[] args) {
    Egg2 e2 = new BigEgg2();
    e2.g();
  }
///:~


           
         
  
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15. Using inner classes for callbacksUsing inner classes for callbacks
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17. With concrete or abstract classes, inner classes are the only way to produce the effect
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
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