原型模式

用原型实例指定创建对象的种类,并且通过拷贝这些原型创建新的对象。

Prototype模式允许一个对象再创建另外一个可定制的对象，根本无需知道任何如何创建的细节,工作原理是:通过将一个原型对象传给那个要发动创建的对象，这个要发动创建的对象通过请求原型对象拷贝它们自己来实施创建。

 

package org.fanzone.pattern.prototype;

/** 

 * Title: base<br> 

 * Description: Prototype<br> 

 * Copyright: Copyright (c) 2011 <br> 

 * Create DateTime: Jul 7, 2011 8:34:01 PM <br> 

 * @author wangmeng

 */

public abstract class Animal implements Cloneable{

String statement;

public String getStatement() {

return statement;

}

public void setStatement(String statement) {

this.statement = statement;

}

public Object clone(){

Object obj = null;

try {

obj = this.getClass().newInstance();

} catch (InstantiationException e) {

e.printStackTrace();

} catch (IllegalAccessException e) {

e.printStackTrace();

}

return obj;

}

}

--------------------------------------------------------

package org.mars.pattern.prototype;

/** 

 * Title: base<br> 

 * Description: Concrete Prototype to clone.<br> 

 * Copyright: Copyright (c) 2011 <br> 

 * Create DateTime: Jul 7, 2011 8:44:24 PM <br> 

 * @author wangmeng

 */

public class DonaldDuck extends Animal {

public DonaldDuck() {

this.setStatement("Hi,everyone! I'm the Donald Duck.");

}

}

--------------------------------------------------------------------------

package org.mars.pattern.prototype;

/** 

 * Title: base<br> 

 * Description: Concrete Prototype to clone.<br> 

 * Copyright: Copyright (c) 2011 <br> 

 * Create DateTime: Jul 7, 2011 8:40:03 PM <br> 

 * @author wangmeng

 */

public class MickeyMouse extends Animal {

public MickeyMouse(){

this.setStatement("Hello,everybody! I'm the Mickey Mouse.");

}

}

----------------------------------------------------------------------------

package org.mars.pattern.prototype;

/** 

 * Title: base<br> 

 * Description: Client<br> 

 * Copyright: Copyright (c) 2011 <br> 

 * Create DateTime: Jul 7, 2011 8:48:31 PM <br> 

 * @author wangmeng

 */

public class Zoo {

private Animal animal;

public Zoo(Animal animal){

this.animal = animal;

}

public Animal makeAnimal(){

return (Animal) this.animal.clone();

}

@Override

protected Object clone() throws CloneNotSupportedException {

//This clone is not the same as the CLONE that defined by myself.

return super.clone();

}

public static void main(String[] args){

Zoo zoo = null;

Animal animal = null;

DonaldDuck duck = new DonaldDuck();

MickeyMouse mouse = new MickeyMouse();

//Make three ducks.

//Set the prototype.

zoo = new Zoo(duck);

for(int i=0; i<3; i++){

//#Get many objects by copying prototype.

//#(Just see the hashCode of object and the answer is front.)

animal = zoo.makeAnimal();

System.out.println(animal.hashCode() + ": " + animal.getStatement());

}

//Make two mice.

zoo = new Zoo(mouse);

for(int i=0; i<2; i++){

animal = zoo.makeAnimal();

System.out.println(animal.hashCode() + ": " + animal.getStatement());

}

}

}