原型模式属于创建型模式，用原型的实例指定创建对象的种类，并通过拷贝这些原型创建新的对象。调用者不需要关注具体的复制过程，而且不需要知道任何创建的细节，通俗来讲，就是使用一个对象复制一个一模一样的对象出来，目的就是保护最原始的那一份存档。

为什么要保护最原始的那一份存档？以工业生产为例，这里的最原始的那一份存档就相当于工厂中某一商品的模具，其他的所有商品都是由这个模具为雏形，所以，这个模具是不能轻易改变，如果生产了一个商品后，这个商品把模具改变了，那么其后边被生产的产品就不再满足设计要求了。这一特点也决定了原型模式的一个应用场景。

那么原型模式通常应用在哪些方面？

1.从时间成本来说和性能消耗方面来说，假设一个需求中需要创建大量相同的对象，而对象的创建又很耗费时间资源或者空间资源，又不依赖于类的构造方法的时候（clone不会执行构造方法），可以使用原型模式

public interface Prototype {    Prototype cloneMessage();}

public interface IMessage extends Prototype{    String content();    String sender();    String receiver();    String image();    String voice();    }

public class ImageMessage implements Cloneable,IMessage{        public String sender;    public String content;    public String receiver;    public String voice;    public String image;    @Override    public String content() {        return content;    }    @Override    public String sender() {        return sender;    }    @Override    public String receiver() {        return receiver;    }        public void setContent(String content){        this.content = content;    }        public void setReceiver(String receiver){        this.receiver = receiver;    }        public void setSender(String sender){        this.sender = sender;    }    public void setImage(String image){        this.image = image;    }    public String image() {        return image;    }    @Override    public Prototype cloneMessage() {        ImageMessage message = new ImageMessage();        message.content = this.content;        message.image = this.image;        message.receiver = this.receiver;        message.sender = this.sender;        message.voice = this.voice;        return message;            }    @Override    public String voice() {        // TODO Auto-generated method stub        return null;    }}

public class VoiceMessage implements IMessage{        public String sender;    public String content;    public String receiver;        public String voice;    private String image;        @Override    public String content() {        return content;    }    @Override    public String sender() {        return sender;    }    @Override    public String receiver() {        return receiver;    }        public void setContent(String content){        this.content = content;    }        public void setReceiver(String receiver){        this.receiver = receiver;    }        public void setSender(String sender){        this.sender = sender;    }        public void setVoice(String voice){        this.voice = voice;    }        public String voice(){        return voice;    }    @Override    public Prototype cloneMessage() {        VoiceMessage message = new VoiceMessage();        message.content = this.content;        message.voice = this.voice;        message.receiver = this.receiver;        message.sender = this.sender;        message.image = this.image;        return message;    }    @Override    public String image() {        return image;    }}

public class Client {    public static void main(String[] args) {                VoiceMessage m = new VoiceMessage();        m.setContent("语音消息");        m.setSender("张三");        m.setReceiver("李四");        m.setVoice("语音");        //      ImageMessage m = new ImageMessage();//      m.setContent("图片消息");//      m.setSender("张三");//      m.setReceiver("李四");//      m.setImage("图片");                MessageEngine.sendMessage(m);    }}

public class MessageEngine {    public static void sendMessage(IMessage message){           IMessage m = (IMessage) message.cloneMessage();         System.out.println("发送消息----消息内容："+m.content()+"---消息发送人："+m.sender()+"---消息接受人："+m.receiver()+"---图片："+m.image()+"---语音："+m.voice());    }}