Java built in classes

There are 5,000 or so classes built-in to Java, and programmers have written hundreds of thousands if not millions of their own.

There are 5,000 or so classes built-in to Java, and programmers have written hundreds of thousands if not millions of their own.

A built-in class is a class whose instances have restricted capabilities or special representations . Attempting to use defclass to define subclasses of a built-in class signals an error of type error. Calling make-instance to create an instance of a built-in class signals an error of type error.