Java Object Cloning Learn

There is an empty interface in the 1.java interface called the identity interface, and this interface value acts as an identity. 2. To implement a Java object clone, you need to use the object class protected Object Clone () throws Clonenotsupportedexception
method, which is protected qualified, can be accessed in this package, or in a subclass of a different package, and throws an exception.

3. If you want to implement an object clone first cloned class must implement the Cloneable interface, if this interface is not implemented, calling the Clone () method throws a Clonenotsupportedexception exception.
4. After implementing the Cloneable interface, because the Clone method in the object class cannot be accessed, we must override the Clone method Call the Clone () method of the parent class in the Clone () method of the child class

Package Com.clone;class Cat implements cloneable{private int age;private String name;public void Setage (int. age) {This.age = age;} public int getage () {return age;} Public Cat (int age,string name) {this.age=age;this.name=name;} Public String toString () {return name: "+this.name+", Age: "+this.age;} @Overrideprotected Object Clone () throws Clonenotsupportedexception {//TODO auto-generated method Stubreturn Super.clone ();}} public class Testclone {public static void main (string[] args) {cat cat1=new cat (20, "small white"); Cat Cat2=null;try {cat2= (cat) Cat1.clone ()} catch (Clonenotsupportedexception e) {//TODO auto-generated catch Blocke.printstacktrace ();} System.out.println (CAT1); System.out.println (CAT2); Cat1.setage (30); System.out.println (CAT1); System.out.println (CAT2); System.out.println (CAT1==CAT2);}}

　　

Java Object Cloning Learn