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NullPointerException

java.lang

Class NullPointerException



  • public class NullPointerException
    extends RuntimeException
    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 null. It also occurs in some other, less obvious circumstances, like a throw e statement where the Throwable reference is null.
    • Constructor Detail

      • NullPointerException

        public NullPointerException()
        Constructs a new NullPointerException that includes the current stack trace.
      • NullPointerException

        public NullPointerException(String detailMessage)
        Constructs a new NullPointerException with the current stack trace and the specified detail message.
        Parameters:
        detailMessage - the detail message for this exception.