java克隆测试

1.person类

//clone方法必须实现Cloneable接口
public class Person implements Cloneable {
    private String name;
    private int age;
    public Calendar calendar;

    public Person() {
    }

    // 构造方法
    public Person(String name, int age, Calendar calendar) {
        this.name = name;
        this.age = age;
        this.calendar = calendar;
    }

    @Override
    public Person clone() throws CloneNotSupportedException {
        Person cloned = (Person) super.clone();// 浅层克隆
        cloned.calendar = (Calendar) calendar.clone();// 深度克隆，克隆属性
        return cloned;
    }

    @Override
    public String toString() {// 重写toString方法
        return "Person  [ name = " + name + " |  age = " + age + " | Calendar = " + calendar.getTime() + " ]";
    }

    public Calendar getCalendar() {
        return calendar;
    }

    public void setCalendar(Calendar calendar) {
        this.calendar = calendar;
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

}

2.克隆测试

//克隆测试
public class CloneTest00 {
    public static void main(String[] args) throws CloneNotSupportedException {
        Calendar now = Calendar.getInstance();
        Person p1 = new Person("Tim", 18, now);
        Person p2 = p1.clone();
        p2.setName("danny");
        p2.setAge(11);
        p2.calendar.set(2000, 11, 11);
        System.out.println("p2 = " + p2.toString());
        System.out.println("p1 = " + p1.toString());
    }
}// 改变p2的值，不会改变p1的值

3.非克隆测试

//非克隆测试
public class NotCloneTest00 {
    public static void main(String[] args) {
        Calendar now = Calendar.getInstance();
        Person p1 = new Person("Tim", 18, now);
        Person p2 = p1;
        p2.setName("danny");
        p2.setAge(11);
        p2.calendar.set(2000, 11, 11);
        System.out.println("p2 = " + p2.toString());
        System.out.println("p1 = " + p1.toString());
    }
}// 改变p2的值，p1的值跟随改变