prototype怎么记忆（原型模式Prototype）

prototype怎么记忆（原型模式Prototype）import java.io.Serializable; public class GoldRingedStaff implements Cloneable Serializable{ private float height=100.0F; private float diameter=10.0F; public GoldRingedStaff() { } public void grow() { this.diameter*=2.0; this.height*=2; } public void shrink() { this.diameter/=2; this.height/=2; } public void move() { } public float getHeight() { return height; }

1.什么是原型模式?

通过给出一个一个原型对象来指明所要创建的对象的类型，然后用复制这个原型对象的办法创建出更多同类型的对象。

2.简单形式的原始模型

• 客户（Client）角色：客户类提出创建对象的请求。
• 抽象（Prototype）原型角色:这是一个抽象角色，通常由一个Java接口或Java抽象类实现。此角色给出所有的具体原型类所需的接口。
• 具体原型（Concrete prototype）角色:被复制的对象。此角色需要实现抽象的原型角色所要求的接口。

public interface Prototype extends Cloneable{ public Object clone(); } public class Client1 { private Prototype prototype; public void operation(Prototype example) { Prototype p = (Prototype)example.clone(); } } public class ConcretePrototype implements Prototype{ @Override protected Object clone() { try { return super.clone(); }catch (Exception e) { // TODO: handle exception return null; } } } public interface Prototype extends Cloneable{ Prototype clone(); }

3.登记形式的原始模型模式

• 客户端（Client）角色:客户端类向管理员提出创建对象的请求。
• 抽象原型(Prototype)角色:这是一个抽象角色，通常由一个接口或抽象类实现。此角色给出所有的具体原型类所需的接口。
• 具体原型(Concrete Prototype)角色:被复制的对象。需要实现抽象的原型角色所要求的接口。
• 原型管理器（Prototype Manager）角色:创建具体原型类的对象，并记录每一个被创建的对象。

public interface Prototype extends Cloneable{ public Object clone(); } public class ConcretePrototype implements Prototype{ @Override public synchronized Object clone() { Prototype temp = null; try { temp = (Prototype) super.clone(); return temp; } catch (CloneNotSupportedException e) { e.printStackTrace(); }finally { return temp; } } } import java.util.Vector; public class PrototypeManager { @SuppressWarnings("rawtypes") private Vector objects=new Vector(); @SuppressWarnings("unchecked") public void add(Prototype object) { objects.add(object); } public Prototype get(int i) { return (Prototype) objects.get(i); } public int getSize() { return objects.size(); } } public class Client { private PrototypeManager mgr; private Prototype prototype; public void registerPrototype() { prototype = new ConcretePrototype(); Prototype copytype = (Prototype) prototype.clone(); mgr.add(copytype); } }

4.浅复制（浅克隆）

被复制对象的所有变量都含有与原来的对象相同的值，而所有的对其他对象的引用都仍然指向原来的对象。换言之，浅复制仅仅复制所考虑的对象，而不复制它所引用的对象。

public class GoldRingedStaff { private float height=100.0F; private float diameter=10.0F; public GoldRingedStaff() { } public void grow() { this.diameter*=2.0; this.height*=2; } public void shrink() { this.diameter/=2; this.height/=2; } public void move() { } public float getHeight() { return height; } public void setHeight(float height) { this.height = height; } public float getDiameter() { return diameter; } public void setDiameter(float diameter) { this.diameter = diameter; } } import java.util.Date; public class Monkey implements Cloneable{ private int height; private int weight; private GoldRingedStaff staff; private Date birthDate; public Monkey() { super(); } public Monkey(Date birthDate) { super(); this.birthDate = birthDate; } @SuppressWarnings("finally") public Object clone() { Monkey temp=null; try { temp = (Monkey) super.clone(); } catch (CloneNotSupportedException e) { e.printStackTrace(); }finally { return temp; } } public int getHeight() { return height; } public void setHeight(int height) { this.height = height; } public int getWeight() { return weight; } public void setWeight(int weight) { this.weight = weight; } public Date getBirthDate() { return birthDate; } public void setBirthDate(Date birthDate) { this.birthDate = birthDate; } public GoldRingedStaff getStaff() { return staff; } public void setStaff(GoldRingedStaff staff) { this.staff = staff; } } import java.util.Date; public class TheGreatestSage { private Monkey monkey = new Monkey(new Date()); public void change() { Monkey copyMonkey; for(int i=0;i<1000;i ) {} copyMonkey=(Monkey) monkey.clone(); System.out.println(monkey.getBirthDate()); System.out.println(copyMonkey.getBirthDate()); System.out.println(monkey==copyMonkey); System.out.println(monkey.getStaff()==copyMonkey.getStaff()); } public static void main(String[] args) { TheGreatestSage sage = new TheGreatestSage(); sage.change(); } }

5.深复制（深克隆）

被复制对象的所有的变量都含有与原来的对象的相同的值，除去那些引用其他对象的变量。那些引用其他对象的变量将指向被复制过的新对象，而不再是原有的那些被引用的对象。换言之，深复制把要复制的对象所引用的对象都复制一遍，而这种对被引用的对象的复制叫间接复制。

import java.io.Serializable; public class GoldRingedStaff implements Cloneable Serializable{ private float height=100.0F; private float diameter=10.0F; public GoldRingedStaff() { } public void grow() { this.diameter*=2.0; this.height*=2; } public void shrink() { this.diameter/=2; this.height/=2; } public void move() { } public float getHeight() { return height; } public void setHeight(float height) { this.height = height; } public float getDiameter() { return diameter; } public void setDiameter(float diameter) { this.diameter = diameter; } } import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutput; import java.io.ObjectOutputStream; import java.io.Serializable; import java.util.Date; public class Monkey implements Cloneable Serializable{ private int height; private int weight; private GoldRingedStaff staff; private Date birthDate; public Monkey() { this.birthDate = new Date(); this.staff = new GoldRingedStaff(); } public Object deepClone() throws IOException ClassNotFoundException { ByteArrayOutputStream bo = new ByteArrayOutputStream(); ObjectOutputStream oo = new ObjectOutputStream(bo); oo.writeObject(this); ByteArrayInputStream bi = new ByteArrayInputStream(bo.toByteArray()); ObjectInputStream oi = new ObjectInputStream(bi); return oi.readObject(); } @SuppressWarnings("finally") public Object clone() { Monkey temp=null; try { temp = (Monkey) super.clone(); } catch (CloneNotSupportedException e) { e.printStackTrace(); }finally { return temp; } } public int getHeight() { return height; } public void setHeight(int height) { this.height = height; } public int getWeight() { return weight; } public void setWeight(int weight) { this.weight = weight; } public Date getBirthDate() { return birthDate; } public void setBirthDate(Date birthDate) { this.birthDate = birthDate; } public GoldRingedStaff getStaff() { return staff; } public void setStaff(GoldRingedStaff staff) { this.staff = staff; } } import java.io.IOException; import java.util.Date; public class TheGreatestSage { private Monkey monkey = new Monkey(); public void change() throws ClassNotFoundException IOException { Monkey copyMonkey; for(int i=0;i<1000;i ) {} copyMonkey=(Monkey) monkey.deepClone(); System.out.println(monkey.getBirthDate()); System.out.println(copyMonkey.getBirthDate()); System.out.println(monkey==copyMonkey); System.out.println(monkey.getStaff()==copyMonkey.getStaff()); } public static void main(String[] args) { TheGreatestSage sage = new TheGreatestSage(); try { sage.change(); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }