Prototype 原型/克隆

Java自带克隆模式
一个对象的的属性已经确定，需要产生很多相同
首先实现标记型接口cloneable，重写Object中的clone方法

注意点是需要区分浅克隆和深克隆

浅克隆属性类不需要也继承cloneable并重写clone

public class Prototype {
public static void main(String[] args) throws CloneNotSupportedException {
   Local local = new Local(22);
   Person person = new Person(18,local);
   Person person1 = person.clone();
   System.out.println(person1.local == person.local);
   person.local = new Local(33);
   System.out.println(person1.local.num);
}
}
class Person implements Cloneable{
int age;
Local local;
public Person(int age, Local local) {
   this.age = age;
   this.local = local;
}
@Override
protected Person clone() throws CloneNotSupportedException {
   Person person = (Person) super.clone();
   person.local = local.clone();
   return person;
}
}
class Local implements  Cloneable{
int num;
public Local(int num) {
   this.num = num;
}
@Override
protected Local clone() throws CloneNotSupportedException {
   Local local = (Local) super.clone();
   return local;
}
}