Summary

Summary

Let’s summarize this chapter:

• null is the value indicating that a variable does not provide access to any value.

• References that have the null value can only be used in two operations: assigning a value to them and determining whether they are null or not.

• Since the == operator may have to access an actual object, determining whether a variable is null must be performed by the is operator.

• !is is the opposite of is.

• Assigning null to a variable makes that variable provide access to nothing.

• Objects that are not referenced by any variable are finalized by the garbage collector.