NullPointerException is a kind of unchecked exception
that occurs when an application attempts to use
null in a
case where an object is required. It is also known as runtime time exception,
which occurs while running a program. This type of exception is internal to
the application and extends the java.lang.RuntimeException that is
NullPointerException must bethrown when an application attempts to use
in a case where an object is required. These include:
nullas if it were an array.
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