Home » Tip Bank » Java
  • Comment on this Article
Language: Java
Expertise: Beginner
Nov 21, 2018
  • facebook
  • twitter
  • google+
  • in
  • Email

WEBINAR:

On-Demand

Building the Right Environment to Support AI, Machine Learning and Deep Learning


Watch

Dereferencing in Java

Dereferencing happens using the . operator:

Object object = new Object();

String text = object.toString(); // 'object' is dereferenced.

Dereferencing pursues the memory address placed in a reference, to the place in memory where the actual object is. When an object has been found, the requested method is called; if the reference has the value null, dereferencing results in a NullPointerException:

Object obj = null;

obj.toString(); // Throws a NullpointerException when this statement is executed.

Null indicates the absence of a value, so there is no object on which the requested method can be called.

Octavia Anghel
 
Submit a Tip
Browse "Java" Tips
Browse All Tips
enable-javascript.com
activatejavascript.org