创建型---prototype模式

• 代码：

package com.design;
import java.util.ArrayList;

/**
 * 
 * @author Administrator
 *
 */
class ConcretePrototype implements Cloneable { 
    /**
     * 成员变量
     * namelist 测试深拷贝 
     */
    private ArrayList<String> nameList = new ArrayList<String>(); 
    
    /**
     * 构造函数
     */
    public ConcretePrototype() { 
      } 
    
    /**
     * 添加name到namelist
     * @param name
     */
    public void setName(String name) { 
        this.nameList.add(name); 
      } 
    
     /**
      *  获取namelist
      * @return
      */
     public ArrayList<String> getNameList() { 
        return this.nameList; 
      } 
      
     /**
      * 覆盖Object基类中的clone()方法，并扩大该方法的访问权限，具体化返回本类型 
      */
     public ConcretePrototype clone() {
         
        ConcretePrototype self = null;   
        try
        {
            self = (ConcretePrototype) super.clone();
            ///以下这句是实现深拷贝的关键 
            self.nameList = (ArrayList<String>) this.nameList.clone();
        }
        catch(CloneNotSupportedException e)
        {
            e.printStackTrace();
        }
        
        return self;
      } 
} 

//测试类 
public class Test { 
      public static void main(String[] args) { 
        ConcretePrototype prototype = new ConcretePrototype();
        prototype.setName("蚂蚁 ...");
        System.out.println("prototype : " + prototype.getNameList()); 
         
        ///通过clone获得一个拷贝 
        ConcretePrototype fromClone = prototype.clone(); 
        fromClone.setName("小蚂蚁 ..."); 
        System.out.println("fromClone : " + fromClone.getNameList());
        System.out.println("prototype : " + prototype.getNameList()); 
      } 
}

• 结果：

prototype : [蚂蚁 ...]
fromClone : [蚂蚁 ..., 小蚂蚁 ...]
prototype : [蚂蚁 ...]