java里的深克隆与浅克隆问题，百度看着傻傻分不清

Question

有人说这样的是浅克隆：class Book implements Cloneable{ private String name; private double price; public String getName() { return name; } public void setName(String name) { this.name = name; } public double getPrice() { return price; } public void setPrice(double price) { this.price = price; } public Book(String name,double price){ this.name=name; this.price=price; } @Override public String toString(){ return name+":"+price; } @Override public Object clone() throws CloneNotSupportedException{ return super.clone(); }}class Student{ private String name; private Book book;}public class CloneTest { public static void main(String[] args) throws CloneNotSupportedException { Book b1 = new Book("luoweideshenlin",26); Book b2 = (Book)b1.clone();//不等价：b2=b1; b2.setName("pingfandeshijie"); b2.setPrice(78); System.out.println(b1.toString()); System.out.println(b2.toString()); System.out.println(b1==b2); }}这个的输入结果是：luoweideshenlin:26.0pingfandeshijie:78.0false那怎么样算深克隆呢，

Answer 1

深复制不仅复制对象本身,也会复制对象的成员变量. 你可以试下Student类默认的克隆方法, 克隆后两个Studnet对象引用的book对象实际上是同一个.