Null Pointer Exception in Java Programming

Complete Java Programming Fundamentals With Sample Projects

98 Lectures 7.5 hours

Emenwa Global, Ejike IfeanyiChukwu

More Detail

Get your Java dream job! Beginners interview preparation

85 Lectures 6 hours

Yuval Ishay

More Detail

Core Java bootcamp program with Hands on practice

Featured

99 Lectures 17 hours

Prashant Mishra

More Detail

NullPointerException is a runtime exception and it is thrown when the application try to use an object reference which has a null value.

For example, using a method on a null reference.

Example

Live Demo

public class Tester {
   public static void main(String[] args) {
      Object ref = null;
      ref.toString(); // this will throw a NullPointerException
   }
}

Output

Exception in thread "main" java.lang.NullPointerException
	at Tester.main(Tester.java:4)

Arushi

Updated on 30-Jul-2019 22:30:23

• Related Questions & Answers
• Null Pointer Exception in C#
• What is null pointer exception in Java and how to fix it?
• Exception propagation in Java programming
• NULL pointer in C
• Differentiate the NULL pointer with Void pointer in C language
• Explain the concept of Array of Pointer and Pointer to Pointer in C programming
• Explain reference and pointer in C programming?
• Null Aware Operators in Dart Programming
• Calling class method through NULL class pointer in C++
• How to capture null reference exception in C#?
• Double Pointer (Pointer to Pointer) in C
• Calling a member function on a NULL object pointer in C++
• Chained exception in Java
• Exception propagation in Java
• Exception chaining in Java