Definition of Nullpointerexception

NullPointerException
- exception java.lang..NullPointerException 
public class NullPointerException extends RuntimeException 
Tree:java.lang.Object - java.lang.Throwable - java.lang.Exception - java.lang.RuntimeException - java.lang.NullPointerException
Thrown when an application attempts to use null in a case where an object is required. These include:

NullPointerException()
- Constructor for class java.lang.NullPointerException 
public NullPointerException ()
Constructs a NullPointerException with no detail message.

NullPointerException(String)
- Constructor for class java.lang.NullPointerException 
public NullPointerException (String  s)
Constructs a NullPointerException with the specified detail message.Parameters: s - the detail message.