原型模式:用原型实例制定创建对象的种类,并且通过拷贝这些原型创建新的对象。
UML 图:
原型类:
package com.cnblog.clarck; /** * 原型类 * * @author clarck * */ public abstract class Prototype { private String mID; public Prototype(String id) { mID = id; } public String getID() { return mID; } public abstract Prototype Clone(); }
具体原型类:
package com.cnblog.clarck; /** * 要想真正拥有克隆的能力,就需要实现Cloneable接口,重写clone方法。通过克隆方法得到的对象得到的是一个本地的副本 * * @author clarck * */ public class ConcreatePrototype1 extends Prototype implements Cloneable { public ConcreatePrototype1(String id) { super(id); } @Override public Prototype Clone() { Prototype protoType = null; try { protoType = (Prototype) clone(); } catch (CloneNotSupportedException e) { e.printStackTrace(); } return protoType; } }
package com.cnblog.clarck; /** * 要想真正拥有克隆的能力,就需要实现Cloneable接口,重写clone方法。通过克隆方法得到的对象得到的是一个本地的副本 * * @author clarck * */ public class ConcreatePrototype2 extends Prototype implements Cloneable { public ConcreatePrototype2(String id) { super(id); } @Override public Prototype Clone() { Prototype protoType = null; try { protoType = (Prototype) clone(); } catch (CloneNotSupportedException e) { e.printStackTrace(); } return protoType; } }
测试类:
package com.cnblog.clarck; /** * 测试类 * * @author clarck * */ public class Client { public static void main(String[] args) { ConcreatePrototype1 p1 = new ConcreatePrototype1("clarck"); ConcreatePrototype1 c1 = (ConcreatePrototype1) p1.Clone(); String str = String.format("id:%s", c1.getID()); System.out.println(str); ConcreatePrototype1 p2 = new ConcreatePrototype1("clarck2"); ConcreatePrototype1 c2 = (ConcreatePrototype1) p2.Clone(); String str2 = String.format("id:%s", c2.getID()); System.out.println(str2); } }