Prototype pattern－原型模式

package com.sinosoft.train.gof.cp;
/**
 * Prototype Class
 */
abstract class PrototypeFactory implements Cloneable {
    public Object clone() throws CloneNotSupportedException {
        // call Object.clone()
        PrototypeFactory copy = (PrototypeFactory) super.clone();
        //In an actual implementation of this pattern you might now change references to
        //the expensive to produce parts from the copies that are held inside the prototype.
        return copy;
    }

    abstract void prototypeFactory(int x);

    abstract void printValue();
}

/**
 * Concrete Prototypes to clone
 */
class PrototypeImpl extends PrototypeFactory {
    int x;

    public PrototypeImpl(int x) {
        this.x = x;
    }

    @Override
    void prototypeFactory(int x) {
        this.x = x;
    }

    public void printValue() {
        System.out.println("Value :" + x);
    }
}

/**
 * Client Class
 */
public class Prototype {

    private PrototypeFactory example; // Could have been a private Cloneable example.

    public Prototype(PrototypeFactory example) {
        this.example = example;
    }

    public PrototypeFactory makeCopy() throws CloneNotSupportedException {
        return (PrototypeFactory) this.example.clone();
    }

    public static void main(String args[]) {
        try {
            PrototypeFactory tempExample = null;
            int num = 1000;
            PrototypeFactory prot = new PrototypeImpl(1000);
            Prototype cm = new Prototype(prot);
            for (int i = 0; i < 10; i++) {
                tempExample = cm.makeCopy();
                tempExample.prototypeFactory(i * num);
                tempExample.printValue();
            }
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
    }
}