115 lines
2.6 KiB
Java
115 lines
2.6 KiB
Java
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//: polymorphism/Frog.java
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// Cleanup and inheritance.
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package polymorphism;
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import static net.mindview.util.Print.*;
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class Characteristic {
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private String s;
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Characteristic(String s) {
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this.s = s;
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print("Creating Characteristic " + s);
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}
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protected void dispose() {
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print("disposing Characteristic " + s);
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}
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}
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class Description {
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private String s;
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Description(String s) {
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this.s = s;
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print("Creating Description " + s);
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}
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protected void dispose() {
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print("disposing Description " + s);
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}
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}
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class LivingCreature {
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private Characteristic p =
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new Characteristic("is alive");
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private Description t =
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new Description("Basic Living Creature");
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LivingCreature() {
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print("LivingCreature()");
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}
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protected void dispose() {
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print("LivingCreature dispose");
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t.dispose();
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p.dispose();
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}
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}
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class Animal extends LivingCreature {
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private Characteristic p =
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new Characteristic("has heart");
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private Description t =
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new Description("Animal not Vegetable");
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Animal() { print("Animal()"); }
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protected void dispose() {
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print("Animal dispose");
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t.dispose();
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p.dispose();
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super.dispose();
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}
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}
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class Amphibian extends Animal {
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private Characteristic p =
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new Characteristic("can live in water");
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private Description t =
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new Description("Both water and land");
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Amphibian() {
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print("Amphibian()");
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}
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protected void dispose() {
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print("Amphibian dispose");
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t.dispose();
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p.dispose();
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super.dispose();
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}
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}
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public class Frog extends Amphibian {
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private Characteristic p = new Characteristic("Croaks");
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private Description t = new Description("Eats Bugs");
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public Frog() { print("Frog()"); }
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protected void dispose() {
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print("Frog dispose");
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t.dispose();
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p.dispose();
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super.dispose();
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}
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public static void main(String[] args) {
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Frog frog = new Frog();
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print("Bye!");
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frog.dispose();
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}
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} /* Output:
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Creating Characteristic is alive
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Creating Description Basic Living Creature
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LivingCreature()
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Creating Characteristic has heart
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Creating Description Animal not Vegetable
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Animal()
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Creating Characteristic can live in water
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Creating Description Both water and land
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Amphibian()
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Creating Characteristic Croaks
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Creating Description Eats Bugs
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Frog()
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Bye!
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Frog dispose
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disposing Description Eats Bugs
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disposing Characteristic Croaks
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Amphibian dispose
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disposing Description Both water and land
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disposing Characteristic can live in water
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Animal dispose
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disposing Description Animal not Vegetable
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disposing Characteristic has heart
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LivingCreature dispose
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disposing Description Basic Living Creature
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disposing Characteristic is alive
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*///:~
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