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Showing content from https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/NullPointerException.html below:

NullPointerException (Java SE 21 & JDK 21)

All Implemented Interfaces:

Serializable

Thrown when an application attempts to use

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. NullPointerException objects may be constructed by the virtual machine as if suppression were disabled and/or the stack trace was not writable.

Since:

1.0

See Also:

• Serialized Form

• Constructor Summary

  Constructors

  Constructs a NullPointerException with no detail message.

  Constructs a NullPointerException with the specified detail message.

• Method Summary

  Returns the detail message string of this throwable.

  Methods declared in class java.lang.ThrowableaddSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

• Constructor Details
  • 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.

• Method Details
  • getMessage

    If a non-null message was supplied in a constructor it is returned. Otherwise, an implementation specific message or null is returned.

    Overrides:

    getMessage in class Throwable

    Implementation Note:

    If no explicit message was passed to the constructor, and as long as certain internal information is available, a verbose description of the null reference is returned. The internal information is not available in deserialized NullPointerExceptions.

    Returns:

    the detail message string, which may be null.

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