Cleanup and inheritance : Inheritance Composition « Class « Java

1. Java
2. Class
3. Inheritance Composition

Cleanup and inheritance

// : c07:Frog.java
// Cleanup and inheritance.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
class Characteristic {
  private String s;

  Characteristic(String s) {
    this.s = s;
    System.out.println("Creating Characteristic " + s);
  }

  protected void dispose() {
    System.out.println("finalizing Characteristic " + s);
  }
}

class Description {
  private String s;

  Description(String s) {
    this.s = s;
    System.out.println("Creating Description " + s);
  }

  protected void dispose() {
    System.out.println("finalizing Description " + s);
  }
}

class LivingCreature {
  private Characteristic p = new Characteristic("is alive");

  private Description t = new Description("Basic Living Creature");

  LivingCreature() {
    System.out.println("LivingCreature()");
  }

  protected void dispose() {
    System.out.println("LivingCreature dispose");
    t.dispose();
    p.dispose();
  }
}

class Animal extends LivingCreature {
  private Characteristic p = new Characteristic("has heart");

  private Description t = new Description("Animal not Vegetable");

  Animal() {
    System.out.println("Animal()");
  }

  protected void dispose() {
    System.out.println("Animal dispose");
    t.dispose();
    p.dispose();
    super.dispose();
  }
}

class Amphibian extends Animal {
  private Characteristic p = new Characteristic("can live in water");

  private Description t = new Description("Both water and land");

  Amphibian() {
    System.out.println("Amphibian()");
  }

  protected void dispose() {
    System.out.println("Amphibian dispose");
    t.dispose();
    p.dispose();
    super.dispose();
  }
}

public class Frog extends Amphibian {
  private Characteristic p = new Characteristic("Croaks");

  private Description t = new Description("Eats Bugs");

  public Frog() {
    System.out.println("Frog()");
  }

  protected void dispose() {
    System.out.println("Frog dispose");
    t.dispose();
    p.dispose();
    super.dispose();
  }

  public static void main(String[] args) {
    Frog frog = new Frog();
    System.out.println("Bye!");
    frog.dispose();

  }
} ///:~



           
       

Related examples in the same category

1.	Combining composition and inheritance
2.	Inheritance, constructors and arguments
3.	Inheritance syntax and properties
4.	Composition for code reuse
5.	Proper inheritance of an inner class
6.	Extending an interface with inheritance
7.	Inheriting an inner class