继承与清除

//: c07:Frog.java
// Cleanup and inheritance.
import com.bruceeckel.simpletest.*;

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 static Test monitor = new Test();
	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();
		monitor.expect(new String[] { 
				"Creating Characteristic is alive",
				"Creating Description Basic Living Creature",
				"LivingCreature()", 
				"Creating Characteristic has heart",
				"Creating Description Animal not Vegetable", 
				"Animal()",
				"Creating Characteristic can live in water",
				"Creating Description Both water and land", 
				"Amphibian()",
				"Creating Characteristic Croaks",
				"Creating Description Eats Bugs", 
				"Frog()", 
				"Bye!",
				"Frog dispose", 
				"finalizing Description Eats Bugs",
				"finalizing Characteristic Croaks", 
				"Amphibian dispose",
				"finalizing Description Both water and land",
				"finalizing Characteristic can live in water",
				"Animal dispose",
				"finalizing Description Animal not Vegetable",
				"finalizing Characteristic has heart",
				"LivingCreature dispose",
				"finalizing Description Basic Living Creature",
				"finalizing Characteristic is alive" });
	}
} // /:~