java.lang: public class: NullPointerException

java.lang
public class: NullPointerException [javadoc | source]

java.lang.Object
   java.lang.Throwable
      java.lang.Exception
         java.lang.RuntimeException
            java.lang.NullPointerException

All Implemented Interfaces:
Serializable

Thrown when a program tries to access a field or method of an object or an element of an array when there is no instance or array to use, that is if the object or array points to {@code null}. It also occurs in some other, less obvious circumstances, like a {@code throw e} statement where the Throwable reference is {@code null}.

Constructor:

Constructor:
public NullPointerException() { super(); } Constructs a new {@code NullPointerException} that includes the current stack trace.
public NullPointerException(String detailMessage) { super(detailMessage); } Constructs a new {@code NullPointerException} with the current stack trace and the specified detail message. Parameters: `detailMessage` - the detail message for this exception.

 public NullPointerException() {
        super();
}

Constructs a new {@code NullPointerException} that includes the current stack trace.

 public NullPointerException(String detailMessage) {
        super(detailMessage);
}

Constructs a new {@code NullPointerException} with the current stack trace and the specified detail message.

Parameters:

detailMessage - the detail message for this exception.

Methods from java.lang.Throwable:
fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

Methods from java.lang.Object:
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait