原型模式（Prototype）

Intent

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。

Class Diagram

 

Implementation

public abstract class Prototype {
    abstract Prototype myClone();
}

public class ConcretePrototype extends Prototype {

    private String filed;

    public ConcretePrototype(String filed) {
        this.filed = filed;
    }

    @Override
    Prototype myClone() {
        return new ConcretePrototype(filed);
    }

    @Override
    public String toString() {
        return filed;
    }
}

public class Client {
    public static void main(String[] args) {
        Prototype prototype = new ConcretePrototype("abc");
        Prototype clone = prototype.myClone();
        System.out.println(clone.toString());
    }
}

abc

JDK

• java.lang.Object#clone()