Object_clone

package cn.itcast_04;

public class Student4 implements Cloneable {
    private String name;
    private int age;

    public Student4() {
        super();
    }

    public Student4(String name, int age) {
　　　　　//调用是Object构造方法　　　　
        super();
        this.name = name;
        this.age = age;
    }

    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;
    }
    
    //重写clone()方法重写
    @Override
    protected Object clone() throws CloneNotSupportedException {
        return super.clone();
    }
}

package cn.itcast_04;
/* 
 *protected void finalize();当垃圾回收器确定不存在对象有更多引用时候,垃圾回收器调用此方法
 *但是什么时候调用该方法不知道
 *
 *proected Object clone();创建并且返回该对象的副本
 *    A:重写该方法;
 *
 *    Cloneabel;此类实现了Cloneable 接口,以指示Object.clone()方法对对象复制
            换句话说,只有实现该接口,才能复制对象
    Cloneable 是标志接口,里面没有方法,只有继承该方法才能克隆对象
 */
 
public class StudentDemo4
{
    public static void main(String[] args) throws CloneNotSupportedException
    {
        //创建学生对象
        Student4 s = new Student4();
        
        s.setName("liqingxiang");
        s.setAge(24);
        Object obj = s.clone();
        Student4 s2 = (Student4)obj;
        System.out.println("name:" + s.getName() + ",  age:" +s.getAge());
        System.out.println("name:" + s2.getName() + ",  age:" +s2.getAge());
        System.out.println("==============");
        
        //s对象改变,但是s2对象属性没变,因此他们是两个不同的对象
        s.setAge(29);
        s.setName("xiaoming");
        System.out.println("name:" + s2.getName() + ",  age:" +s2.getAge());
    }
}