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• Java is a collection of packages which are used to create java applications, some are provided by the java designers and are called System classes and users can add additional classes called user defined classes.

• System classes deal with common programming tasks such as data type wrappers to deal with primitive data types, complex Mathematical formulas, and graphical interfaces.

• User defined classes are created by programmers to solve a specific problem, where a system class does not exist.

• All system classes have a method called toString() that converts the data in an object and converts it to a string and return it to the caller.