class Characteristic {
    private String s;
    Characteristic(String s) {
        this.s = s;
        System.out.println("Creating Characteristic " + s);
    }
    protected void dispose() {
        System.out.println("disposing 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("disposing 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 Frog17 extends Amphibian {
    private Characteristic p = new Characteristic("Croaks");
    private Description t = new Description("Eats Bugs");
    public Frog17() { System.out.println("Frog17()"); }
    public static void jump() { System.out.println("frog jumps"); }
    protected void dispose() {
        System.out.println("Frog17 dispose");
        t.dispose();
        p.dispose();
        super.dispose();
    }
    public static void main(String[] args) {
        Frog17 frog = new Frog17();
        try {
            frog.jump();
            System.out.println("Returning from try-finally");
            return;
        } finally {
            System.out.println("Bye!");
            frog.dispose();
        }
    }
}

输出结果：