Clone of Java.lang.Object () use

All Java classes inherit the Java.lang.Object class by default, and there is a Method clone () in the Java.lang.Object class. The documentation for the JDK API explains that this method will return a copy of the object. There are two points to note: one is that the Copy object returns a new object, not a reference. Second, the difference between a copy object and a new object returned with the newly operator is that the copy already contains information about the original object, not the object's initial information.
There are a few things to note about using the Clone () method in Java

1: The Clone class must implement the Cloneable interface, the Cloneable interface is actually an identity interface, there is no interface method, if not implemented Cloneable interface will be reported java.lang.CloneNotSupportedException.

2: The class implementing the Cloneable interface should use a public method to rewrite Object.clone () (It is protected). It is not possible to clone an object that implements this interface. Even if the clone () method is a reflexive call, there is no guarantee that it will succeed.

3: When writing the Clone () method, there is usually a line of code super.clone (); Clone has a default behavior, Super.clone (); Because the first thing to do is to copy the members of the parent class into place, and then copy their own members.

 Public class Implements cloneable {    @Override    public  Clone Clone () {        try  {             Super . Clone ();             return clone;         Catch (clonenotsupportedexception e) {            thrownew  internalerror (e);}}    } 

Clone of Java.lang.Object () use