0
Я смотрел на образец прототипа на этом сайте: http://www.newthinktank.com/2012/09/prototype-design-pattern-tutorial/Шаблон шаблона прототипа, что клонируется?
В sheep.java линии 20 есть этот кусок кода:
sheepObject = (Sheep) super.clone();
При вызове super.close() Арен» Вы копируете интерфейс? Что именно клонируется? Я не понимаю, как клонируются поля и методы овцы.
// By making this class cloneable you are telling Java
// that it is ok to copy instances of this class
// These instance copies have different results when
// System.identityHashCode(System.identityHashCode(bike))
// is called
public interface Animal extends Cloneable {
public Animal makeCopy();
}
.
public class Sheep implements Animal {
public Sheep(){
System.out.println("Sheep is Made");
}
public Animal makeCopy() {
System.out.println("Sheep is Being Made");
Sheep sheepObject = null;
try {
// Calls the Animal super classes clone()
// Then casts the results to Sheep
sheepObject = (Sheep) super.clone();
}
// If Animal didn't extend Cloneable this error
// is thrown
catch (CloneNotSupportedException e) {
System.out.println("The Sheep was Turned to Mush");
e.printStackTrace();
}
return sheepObject;
}
public String toString(){
return "Dolly is my Hero, Baaaaa";
}
}
.
public class CloneFactory {
// Receives any Animal, or Animal subclass and
// makes a copy of it and stores it in its own
// location in memory
// CloneFactory has no idea what these objects are
// except that they are subclasses of Animal
public Animal getClone(Animal animalSample) {
// Because of Polymorphism the Sheeps makeCopy()
// is called here instead of Animals
return animalSample.makeCopy();
}
}
.
public class TestCloning {
public static void main(String[] args){
// Handles routing makeCopy method calls to the
// right subclasses of Animal
CloneFactory animalMaker = new CloneFactory();
// Creates a new Sheep instance
Sheep sally = new Sheep();
// Creates a clone of Sally and stores it in its own
// memory location
Sheep clonedSheep = (Sheep) animalMaker.getClone(sally);
// These are exact copies of each other
System.out.println(sally);
System.out.println(clonedSheep);
System.out.println("Sally HashCode: " + System.identityHashCode(System.identityHashCode(sally)));
System.out.println("Clone HashCode: " + System.identityHashCode(System.identityHashCode(clonedSheep)));
}
}