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Class java.lang.NullPointerException

java.lang.Object
   |
   +----java.lang.Throwable
           |
           +----java.lang.Exception
                   |
                   +----java.lang.RuntimeException
                           |
                           +----java.lang.NullPointerException

public class NullPointerException

extends RuntimeException

• 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()

Constructs a NullPointerException with no detail message.

NullPointerException(String)

Constructs a NullPointerException with the specified detail message.

 public NullPointerException()

Constructs a NullPointerException with no detail message.

 public NullPointerException(String s)

Constructs a NullPointerException with the specified detail message.

Parameters:

s - the detail message.

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