原型模式*

概览
使用原型实例指定要创建对象的类型，通过复制这个原型来创建新对象。

类图

实例

public class Prototype implements Cloneable{
    @Override
    protected Prototype clone() throws CloneNotSupportedException {
        Prototype p=null;
        try{
            p=(Prototype)super.clone();
        }catch (ClassCastException e){
            e.printStackTrace();
        }
        return p;
    }
}

public class ConcretePrototype extends Prototype{
    private String field;
    public ConcretePrototype(String filed){
        this.field=filed;
    }
    @Override
    public String toString() {
        return field;
    }
}

public class Client {
    public static void main(String[] args) throws CloneNotSupportedException {
        Prototype obj1=new ConcretePrototype("abc");
        Prototype obj2=obj1.clone();
        Prototype obj3=obj1.clone();
        System.out.println(obj1);
        System.out.println(obj2);
        System.out.println(obj3);
    }
}

abc
abc
abc