Combining composition and inheritance : Inheritance Composition « Language Basics « Java

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Java » Language Basics » Inheritance CompositionScreenshots 
Combining composition and inheritance
Combining composition and inheritance

// : c06:PlaceSetting.java
// Combining composition & inheritance.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

class Plate {
  Plate(int i) {
    System.out.println("Plate constructor");
  }
}

class DinnerPlate extends Plate {
  DinnerPlate(int i) {
    super(i);
    System.out.println("DinnerPlate constructor");
  }
}

class Utensil {
  Utensil(int i) {
    System.out.println("Utensil constructor");
  }
}

class Spoon extends Utensil {
  Spoon(int i) {
    super(i);
    System.out.println("Spoon constructor");
  }
}

class Fork extends Utensil {
  Fork(int i) {
    super(i);
    System.out.println("Fork constructor");
  }
}

class Knife extends Utensil {
  Knife(int i) {
    super(i);
    System.out.println("Knife constructor");
  }
}

// A cultural way of doing something:

class Custom {
  Custom(int i) {
    System.out.println("Custom constructor");
  }
}

public class PlaceSetting extends Custom {
  private Spoon sp;

  private Fork frk;

  private Knife kn;

  private DinnerPlate pl;

  public PlaceSetting(int i) {
    super(i + 1);
    sp = new Spoon(i + 2);
    frk = new Fork(i + 3);
    kn = new Knife(i + 4);
    pl = new DinnerPlate(i + 5);
    System.out.println("PlaceSetting constructor");
  }

  public static void main(String[] args) {
    PlaceSetting x = new PlaceSetting(9);

  }
///:~



           
       
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4. Cleanup and inheritanceCleanup and inheritance
5. Proper inheritance of an inner classProper inheritance of an inner class
6. Extending an interface with inheritance
7. Inheriting an inner class
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