（二）设计模式系列---原型模式

一  定义

使用原型实例指定待创建对象的类型，并且通过复制这个原型来创建新的对象。其实就是浅拷贝和深拷贝

二 代码实现

public class Person implements Cloneable {

    private String name;
    private String age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age='" + age + '\'' +
                '}';
    }

    @Override
    public Person clone(){
        try {
            return (Person) super.clone();
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
            return null;
        }
    }
}

public class Teacher implements Cloneable {
    private String name;

    private Person person;

    public Person getPerson() {
        return person;
    }

    public void setPerson(Person person) {
        this.person = person;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }


    @Override
    public String toString() {
        return "Teacher{" +
                "name='" + name + '\'' +
                ", person=" + person +
                '}';
    }

    @Override
    public Teacher clone(){

        try {
            Teacher teacher = (Teacher) super.clone();
            Person person = teacher.getPerson();
            teacher.setPerson(person.clone());
            return teacher;
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
            return null;
        }
    }
}

测试

public class PrototypeTest
{
    public static void main( String[] args )
    {
        Teacher teacher = new Teacher();
        teacher.setName("wang");
        Person person = new Person();
        person.setName("li");
        person.setAge("30");

        teacher.setPerson(person);


        System.out.println(teacher.toString());

        Teacher teacher1 = teacher.clone();

        teacher.setName("zhang");
        person.setName("zhangzhang");

        System.out.println(teacher.toString());

        System.out.println(teacher1.toString());



    }
}

输出

Connected to the target VM, address: '127.0.0.1:55142', transport: 'socket'
Disconnected from the target VM, address: '127.0.0.1:55142', transport: 'socket'
Teacher{name='wang', person=Person{name='li', age='30'}}
Teacher{name='zhang', person=Person{name='zhangzhang', age='30'}}
Teacher{name='wang', person=Person{name='li', age='30'}}

Process finished with exit code 0