CS-Notes/notes/设计模式 - 原型模式.md

## 6. 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

<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/b8922f8c-95e6-4187-be85-572a509afb71.png"/> </div><br>

### Implementation

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

```java
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;
    }
}
```

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

```html
abc
```

### JDK

- [java.lang.Object#clone()](http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#clone%28%29)