Java clock design

(Additional file, clock design specification, is required to complete. Can send PDF file via email)For this assignment you implement a system in Java thatfaithfully realizes a set of UML class and sequence diagrams. You will beprovided a set of Java files that reflect the static structure contained in theclass diagrams. Some of the classes will be fully implemented and require onlycommenting. Some classes will be partially implemented and will require you tocomplete the implementation and provide comments. Others will require youimplement the entire class.The system design is contained in the Clock Design Specification document. Each class isdescribed by a class diagram (using the methodology discussed in previouslessons) and written descriptions of each attribute and operation. For many ofthe operations there is an associated sequence diagram that illustrates theinteractions that result from an invocation. Some of the simple operations,like gets and sets, do not have a corresponding sequence diagram as theirimplementations should be obvious.The Java source code is zip file with the necessary setof .java files. The files will be one of the following types: Fully     implemented.     These files require no editing and will indicate so at the top of the     file.Partially     implemented.     These classes will have defined methods for one or more of the operations.     Each is labeled as implemented and require no comments. Operations which     require implementation contain a comment with a ‘TODO’. These     you are required to implement and provide a description of the operation     as well as comment the method code. You will also need to comment each of     the attributes as well as complete the header for the file.Not     implemented.     These classes will contain no implemented operations and you will need to     supply all code. You need to provide a description of the operation as     well as comment the method code. You will also need to comment each of the     attributes as well as complete the header for the file.For each class you may add attributes as this may well benecessary. You are permitted to add operations but it shouldn’t be necessary.You may not create any other classes.Submission RequirementsImportant: Do not use packages. All Java files should be in the default package. Packageslead to a complex nesting of folders and files that make managing thesubmissions difficult. Each each class mustbe contained in its own file and begin with a header of the form.Typo in the Clock DocumentOn the sequence diagram for Clock.start() there are two start() calls on the SixtySecondTimer participant. There should only be one. If you implement it as is what happens is that two timers are created and both tell TimeManager toadvance the time. This results in time moving forward two minutes each timeout.

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