Java设计模式之原型模式

定义:
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

浅复制

   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。

深复制

   被复制对象的所有的变量都含有与原来的对象相同的值，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，深复制把重复的对象所引用的对象都复制一遍，而这种对被引用到的对象的复制叫做间接复制。



浅复制

Mokey.JAVA

package desin.Prototype.lower;

import java.util.Date;



public class Mokey implements Cloneable {

private int height;
private int weight;
private Date birthDate;
private GoldRingdeStaff goldRingdeStaff;

public  Mokey(){
  birthDate= new Date();
}

public Date getBirthDate() {
  return birthDate;
}

public void setBirthDate(Date birthDate) {
  this.birthDate = birthDate;
}

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 Object clone(){
  Mokey mokey=null;
  try {
   mokey=(Mokey)super.clone();
  } catch (CloneNotSupportedException e) {
   // TODO 自动生成 catch 块
   e.printStackTrace();
  }
  finally{
   return mokey;
  }
}

public GoldRingdeStaff getGoldRingdeStaff() {
  return goldRingdeStaff;
}

public void setGoldRingdeStaff(GoldRingdeStaff goldRingdeStaff) {
  this.goldRingdeStaff = goldRingdeStaff;
}

}
GoldRingdeStaff。JAVA

package desin.Prototype.lower;

public class GoldRingdeStaff {
private float height=100.0f;
private float weight=10.0f;
public float getHeight() {
  return height;
}
public void setHeight(float height) {
  this.height = height;
}
public float getWeight() {
  return weight;
}
public void setWeight(float weight) {
  this.weight = weight;
}

}

testClient.JAVA

package desin.Prototype.lower;

public class testClient {
private Mokey mokey= new Mokey();

public void change(){
  Mokey copymokey2;
   copymokey2=(Mokey)mokey.clone();
  System.out.println("monkey birth date :"+mokey.getBirthDate());
  System.out.println("copymokey2 birth date :"+copymokey2.getBirthDate());
  System.out.println("copymokey2 ==monkey :"+(copymokey2==mokey));
  System.out.println("copymokey2 staff ==monkey staff:"+(copymokey2.getGoldRingdeStaff()==mokey.getGoldRingdeStaff()));
}


public static void main(String[] args) {
  // TODO 自动生成方法存根
  testClient testClient= new testClient();
  testClient.change();

}

}



深复制

Mokey.JAVA

package desin.Prototype.deep;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Date;

import com.sun.corba.se.internal.io.OptionalDataException;


public class Mokey implements Serializable, Cloneable {
private int height;
private int weight;
private Date birthDate;
private GoldRingdeStaff goldRingdeStaff;

public  Mokey(){
  this.birthDate=new Date();
  this.goldRingdeStaff=new GoldRingdeStaff();
}

public Date getBirthDate() {
  return birthDate;
}

public void setBirthDate(Date birthDate) {
  this.birthDate = birthDate;
}

public GoldRingdeStaff getGoldRingdeStaff() {
  return goldRingdeStaff;
}

public void setGoldRingdeStaff(GoldRingdeStaff goldRingdeStaff) {
  this.goldRingdeStaff = goldRingdeStaff;
}

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 Object deepClone() throws IOException,OptionalDataException,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());
}

}

GoldRingdeStaff.JAVA

package desin.Prototype.deep;

import java.io.Serializable;



public class GoldRingdeStaff implements Cloneable, Serializable {
private float height=100.0f;
private float weight=10.0f;
public float getHeight() {
  return height;
}
public void setHeight(float height) {
  this.height = height;
}
public float getWeight() {
  return weight;
}
public void setWeight(float weight) {
  this.weight = weight;
}
}
testClient.JAVA

package desin.Prototype.deep;

import java.io.IOException;

import com.sun.corba.se.internal.io.OptionalDataException;


public class testClient {
private Mokey mokey= new Mokey();

public void change()throws IOException,OptionalDataException,ClassNotFoundException{
  Mokey copymokey2;
   copymokey2=(Mokey)mokey.deepClone();
  System.out.println("monkey birth date :"+mokey.getBirthDate());
  System.out.println("copymokey2 birth date :"+copymokey2.getBirthDate());
  System.out.println("copymokey2 ==monkey :"+(copymokey2==mokey));
  System.out.println("copymokey2 staff ==monkey staff:"+(copymokey2.getGoldRingdeStaff()==mokey.getGoldRingdeStaff()));
}


public static void main(String[] args) throws IOException,OptionalDataException,ClassNotFoundException{
  // TODO 自动生成方法存根
  testClient testClient= new testClient();
  testClient.change();

}

}