Package java.lang

Class NullPointerException

  • All Implemented Interfaces:
    Serializable
    public class NullPointerException
extends RuntimeException
    Thrown when an application attempts to use null in a case where an object is required. These include:
    • Calling the instance method of a null object.
    • Accessing or modifying the field of a null object.
    • Taking the length of null as if it were an array.
    • Accessing or modifying the slots of null as if it were an array.
    • Throwing null as if it were a Throwable value.

    Applications should throw instances of this class to indicate other illegal uses of the null object.

    See Also:
    Serialized Form

    • Constructor Detail

      • NullPointerException

        public NullPointerException()
        Constructs a NullPointerException with no detail message.

      • NullPointerException

        public NullPointerException​(String s)
        Constructs a NullPointerException with the specified detail message.
        Parameters:
        s - the detail message.