An inner class cannot be overriden like a method

  
// : c08:BigEgg.java
// An inner class cannot be overriden like a method.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

class Egg {
  private Yolk y;

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

  public Egg() {
    System.out.println("New Egg()");
    y = new Yolk();
  }
}

public class BigEgg extends Egg {

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

  public static void main(String[] args) {
    new BigEgg();
  }
} ///:~

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An inner class cannot be overriden like a method : Inner Class « Class « Java

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