Copy in Java (ii) deep clone

A shallow copy (The Clone () method in the object class) refers to a copy of a variable for the base data type when the object is copied, whereas a variable for a reference type simply copies the reference.

A deep copy (or Deep clone) is a copy of the object content associated with the object and the object.

Entity class:

Package Com.lin.test;import java.io.serializable;/** * @athor TianLin * * June 28, 2015 PM 1:56:18 * **/public class Dog Imple ments serializable{    private static final long serialversionuid = 1L;        Private String dogname;    Public String Getdogname () {        return dogname;    }    public void Setdogname (String dogname) {        this.dogname = Dogname;    }} Package Com.lin.test;import java.io.serializable;/** * @athor TianLin * * June 28, 2015 PM 1:43:24 * **/public class User Impl Ements serializable{        private static final long serialversionuid = 1L;    Private String username;        Private dog dog;    Public String GetUserName () {        return username;    }    public void Setusername (String username) {        this.username = username;    }    Public Dog Getdog () {        return dog;    }    public void Setdog (dog dog) {        This.dog = dog;    }    }

Clone Execution Class:

Package Com.lin.test;import Java.io.bytearrayinputstream;import Java.io.bytearrayoutputstream;import Java.io.objectinputstream;import java.io.objectoutputstream;/** * @athor TianLin * * June 28, 2015 PM 1:44:08 * **/public CLA SS Objcloner {        @SuppressWarnings ("unchecked") public    static  <t>t cloneobj (t obj) {                t retVal = null;                 try{                        //Writes the object to the stream            bytearrayoutputstream BAOs = new Bytearrayoutputstream ();            ObjectOutputStream oos = new ObjectOutputStream (BAOs);            Oos.writeobject (obj);                                    Reads objects from the stream            bytearrayinputstream Bais = new Bytearrayinputstream (Baos.tobytearray ());            ObjectInputStream  ois = new ObjectInputStream (Bais);                        RetVal = (T) ois.readobject ();                    } catch (Exception e) {            e.printstacktrace ();        }                return retVal;}    }

Test class:

Package com.lin.test;/** * @athor TianLin * * June 28, 2015 PM 1:42:47 * **/public class Clonetest {public static void        Main (string[] args) {User user = new User ();                User.setusername ("Zhang San");        Dog dog = new Dog ();                Dog.setdogname ("Puppy 1");                User.setdog (dog);                User User2 = objcloner.cloneobj (user);        SYSTEM.OUT.PRINTLN ("User username:" +user.getusername ());        System.out.println ("User dogname:" + User.getdog (). Getdogname ());        System.out.println ("User2 username:" +user2.getusername ());                System.out.println ("User2 dogname:" + User2.getdog (). Getdogname ());                System.out.println ("-------------------------------------");        User2.setusername ("John Doe");                User2.getdog (). Setdogname ("Puppy 2");        SYSTEM.OUT.PRINTLN ("User username:" +user.getusername ());        System.out.println ("User dogname:" + User.getdog (). Getdogname ()); System.out.println ("UseR2 Username: "+user2.getusername ());    System.out.println ("User2 dogname:" + User2.getdog (). Getdogname ()); }}

Operation Result:

User username: Zhang San user dogname: Puppy 1user2 Username: Zhang San user2 dogname: Puppy 1-------------------------------------user Userna Me: Zhang San user dogname: Puppy 1user2 Username: John Doe user2 dogname: Puppy 2

Excerpt from: http://www.cnblogs.com/Jtianlin/p/4605477.html

Copy in Java (ii) deep clone