Write a java class encapsulating the concept of a telephone number, assuming a telephone number has only a single attribute: a string representing a telephone number. include a constructor, accessor and mutator, and method toString and equals. Also include methods returning the area code and area code description as specified below. Requirements: Class name: Phone Number

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answer: internal fragmentation is the difference between the (fixed) size of a memory hole and the data within in that memory. for example, if a 1,024 byte block of memory holds 800 bytes of data, then the 224 bytes difference is considered lost to internal fragmentation.

external fragmentation occurs when the sum of memory fragments is large enough to satisfy a request, but the holes are non-contiguous and the request cannot be satisfied. this can occur when memory is dynamically allocated and freed.

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