KyaPoocha.com

Huge Collection of Interview Questions

Search our list of 6557 Interview Questions


What is a Null object? 

Posted in C/C++ Interview Questions

It is an object of some class whose purpose is to indicate that a real object of that class does not exist. One common use for a null object is a return value from a member function that is supposed to return an object with some specified properties but cannot find such an object.

Post Your Answer!
Send This to a Friend

← Shadow went to an Isle where the natives lie and the visitors speak truth.
What are the conditions that have to be met for a condition to be an invariant of the class? →

If you liked this question/asnwer, make sure you
Subscribe to KyaPoocha.com RSS feed!


BOOKMARK THIS : BlinkList | del.icio.us | Digg it | Furl | reddit | StumbleUpon | Yahoo MyWeb |

Related Interview Questions

  • Explain about null?  17.11.08

    Null represents a variable with no value inside. There doesn’t exist any value for type Null. Null is defined to be null if and only if it is assigned a const...

  • Explain about converting an object?  17.11.08

    When an object is converted into an object the stance of the object is not modified. A new instance of the class is created if a value of different type if conv...

  • What is a null pointer?  07.11.08

    There are times when it’s necessary to have a pointer that doesn’t point to anything. The macro NULL, defined in , has a value that’s guaranteed to be dif...

  • What is a Null object?  07.11.08

    It is an object of some class whose purpose is to indicate that a real object of that class does not exist. One common use for a null object is a return valuefr...

  • What is the difference between undefined value and null value?  11.10.08

    (i)Undefined value cannot be explicitly stated that is there is no keyword called undefined whereas null value has keyword called null (ii)typeof undefined var...

  • What does javascript null mean?  07.10.08

    The null value is a unique value representing no value or no object. It implies no object,or null string,no valid boolean value,no number and no array object....

  • What is the difference between undefined value and null value?  06.07.06

    (i)Undefined value cannot be explicitly stated that is there is no keyword called undefined whereas null value has keyword called null. (ii)typeof undefined va...

  • What does javascript null mean?  06.07.06

    The null value is a unique value representing no value or no object. It implies no object,or null string,no valid boolean value,no number and no array object....

  • What is a null pointer?  22.03.06

    There are times when it’s necessary to have a pointer that doesn’t point to anything. The macro NULL, defined in , has a value that’s guaranteed to be d...

  • What’s the difference between a null pointer, a NULL macro, the ASCII NUL character and a null string?  12.03.06

    A null pointer is a pointer which doesn't point anywhere. A NULL macro is used to represent the null pointer in source code. It has a value 0 associated with it...