每日设计模式-原型模式

定义实现

用原型实例指定创建对象的种类，并且通拷贝这些原型创建对象。
简单地说，一切支持复制的类都可以称为原型。

在java中可以通过实现Cloneable接口，重写clone()方法来实现。

public class Student implements Cloneable{
    private String name;
    private String sex;
    private int age;

    public String getName() {
        return name;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public int getAge() {
        return age;
    }

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

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

    @Override
    protected Object clone() throws CloneNotSupportedException {
        Student student = new Student();
        student.setName(this.name);
        student.setSex(this.sex);
        student.setAge(this.age);
        return student;
    }
}

public class User {
    public static void main(String[] args) throws CloneNotSupportedException {
        Student student1 = new Student();
        student1.setName("Bill");
        student1.setSex("Boy");
        student1.setAge(23);
        Student student2 = (Student)student1.clone();
        System.out.println(student1.toString() + " " + student1.hashCode());
        System.out.println(student2.toString() + " " + student1.hashCode());
        student2.setName("Jack");
        System.out.println(student1.toString());
        System.out.println(student2.toString());
        System.out.println(student1.equals(student2));
    }
}

输出

Student{name='Bill', sex='Boy', age=23} 66233253
Student{name='Bill', sex='Boy', age=23} 66233253
Student{name='Bill', sex='Boy', age=23}
Student{name='Jack', sex='Boy', age=23}
false