Designpattern_java:prototype Pattern

Prototype mode Prototype patternspecify the kinds of objects to create using a prototypical Instance,and create new objects by Copyi Ng this prototype. Use the prototype instance to specify the kind of object to create and create a new object by copying the prototypes. Java built-in cloning mechanism: implements the Clone () method that cloneable interface overrides object. Abstract prototype Role (PROTOTYPE): This role is an abstract role, usually with a Java interface or abstract class implementation, giving all the interfaces required for a specific prototype class.

package com.DesignPattern.Creational.Prototype;public interface Prototype extends Cloneable {    //克隆方法    Prototype clone();}

Specific prototype role (concrete Prototype): This role is the object being copied and must implement an abstract prototype interface.

package com.DesignPattern.Creational.Prototype;public class ConcretePrototype implements Prototype {    @Override    public Prototype clone() {        try {            return (Prototype) super.clone();        } catch (CloneNotSupportedException e) {            e.printStackTrace();            return null;        }    }}

Customer role (client): This role presents a request to create an object.

package com.DesignPattern.Creational.Prototype;public class Client {    public void operation(Prototype example) {        // 得到example的副本        Prototype p = example.clone();    }}

Example of prototype mode Mail.java

Package com.    Designpattern.creational.prototype;public class Mail implements cloneable {private String receiver;    Private String subject;    Private String appellation;    Private String Contxt;    Private String tail;        Public Mail (string subject, String contxt) {this.subject = subject;    This.contxt = Contxt;        }//Clone method public Mail clone () {mail mail = null;        try {mail = (mail) super.clone ();        } catch (Clonenotsupportedexception e) {e.printstacktrace ();    } return mail;    } public String Getreceiver () {return receiver;    } public void Setreceiver (String receiver) {this.receiver = receiver;    } public String Getsubject () {return subject;    } public void Setsubject (String subject) {this.subject = subject;    } public String Getappellation () {return appellation; } public void Setappellation (String appellation) {this.appellation = AppEllation;    } public String Getcontxt () {return contxt;    } public void Setcontxt (String contxt) {this.contxt = Contxt;    } public String GetTail () {return tail;    } public void Settail (String tail) {this.tail = tail; }}

Clientdemo.java

Package com.  Designpattern.creational.prototype;import Java.util.random;public class Clientdemo {//The number of bills sent, this value is the private from the database    static int max_count = 6;        public static void Main (string[] args) {int i = 0;        Define a Mail object mail mail = new mail ("Activity", "there is ...");        Mail.setappellation ("copyright");            while (I < max_count) {//clone mail Mail clonemail = Mail.clone ();            Clonemail.setappellation (getrandstring (5) + "G (M)");            Clonemail.setreceiver (getrandstring (5) + "@" + getrandstring (8) + ". com");            Send mail SendMail (clonemail);        i++; }}//Send mail public static void SendMail (mail mail) {System.out.println ("title:" + mail.getsubject () + "\ T recipient    : "+ mail.getreceiver () +" \t.....send success! ");} Gets the random string of the specified length public static string getrandstring (int maxLength) {string Source = "Abcdefghijklmnopqrstuvwxyza BcdEFGHIJKLMNOPQRSTUVWXYZ ";        StringBuffer sb = new StringBuffer ();        Random rand = new Random ();        for (int i = 0; i < maxLength; i++) {Sb.append (Source.charat (Rand.nextint ()));    } return sb.tostring (); }}

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Designpattern_java:prototype Pattern