(Java pointer), object reference problem

1. Elicit pointers

On the face of it, Java has no pointers, or, in other words, pointers are weakened. But pointers are still true in Java. In Java we call this a reference.

String a;//Reference is empty

String a = new Srting ("");//content is empty

A points to a handle (two pointers), a method table and a class that points to the object, and a pointer to the object's data.

2. Cloning of objects

Problem:

string S1 = new String ("I am a sting");

String s2 = S1;

In fact, S1 and S2 point to the same object, and the variable holds a reference to the object.

Solve:

1. Define Class XXX
2. Implement the Cloneable interface in a class (The string class is not implemented), and implement the Clone () method
3. Using the Clone () method in the calling class

XXX x1 = new xxx ();

xxx x2 = (XXX) x1.clone ();

(Java pointer), object reference problem