Null References

Data Structures and Algorithms with Object-Oriented Design Patterns in Java

Null References

In Java, it is possible for a reference type variable to refer to nothing at all. A reference that refers to nothing at all is called a null reference . By default, an uninitialized reference is null.

We can explicitly assign the null reference to a variable like this:

f = null;

Also, we can test explicitly for the null reference like this

if (f == null)
    { /* ... */ }