java浅拷贝和深拷贝

这就是java浅拷贝，2个对象的引用地址一样，任意一个对象对字段的修改都会引起另一个对象数据的修改

PRofessor p = new Professor("wangwu", 50);		    Professor p2=p;		    p2.name="zhangmin";		    System.out.println(p.getName());		    System.out.println(p2.getName());上面显然是不合适的，要解决这个问题就需要深拷贝的概念。
深拷贝是真正开辟一个属于自己的内存空间，而不是空间地址的引用。
有笔者以为只要 Professor实现了Cloneable接口，就可以实现深拷贝，是错误的概念，如下：
public class Professor implements Cloneable {    String name;    int age;     Professor(String name, int age) {        this.name = name;        this.age = age;    }        @Override    protected Object clone() throws CloneNotSupportedException {    	return super.clone();    }get  set 略
将
Professor p2=p; 修改为
 Professor p2=(Professor) p.clone();测试后发现显示的name不一样，但这不是深拷贝。比如如果教授实体里面有一个其他对象Student的引用呢？
public class Student {	String name;// 常量对象。	int age;	Student(String name, int age) {		this.name = name;		this.age = age;	}
Student s1 = new Student("zhangsan", 18);		    Professor p = new Professor("wangwu", 50,s1);//教授p有学生zhangsan		    Professor p2=(Professor) p.clone();		    p2.student.name="zhangmin";		    		    System.out.println(p.student.name);		    System.out.println(p2.student.name);发现显示姓名相同，对引用对象student并没有实现深拷贝那么，怎么实现深拷贝呢？
下面使用序列化实现深拷贝
public class Professor implements Serializable {    String name;    int age;    Student student;     Professor(String name, int age) {        this.name = name;        this.age = age;    }        Professor(String name, int age,Student student) {        this.name = name;        this.age = age;        this.student=student;    }        public Object deepClone() throws IOException, OptionalDataException, ClassNotFoundException {		// 将对象写到流里		ByteArrayOutputStream bo = new ByteArrayOutputStream();		ObjectOutputStream oo = new ObjectOutputStream(bo);		oo.writeObject(this);		// 从流里读出来		ByteArrayInputStream bi = new ByteArrayInputStream(bo.toByteArray());		ObjectInputStream oi = new ObjectInputStream(bi);		return (oi.readObject());    }    	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;	}    }main()
Student s1 = new Student("zhangsan", 18);		    Professor p = new Professor("wangwu", 50,s1);//教授p有学生zhangsan		    Professor p2=(Professor) p.deepClone();		    p2.student.name="zhangmin";		    		    System.out.println(p.student.name);		    System.out.println(p2.student.name);发现显示name不一样。彻底实现了深拷贝。
注意，student也需要序列化，否则会出现错误：Exception in thread "main" java.io.NotSerializableException: