COP 2551 – Introduction to OOP Program #4Due: 4 April 2011, Wstart of classDrop dead: 6 April 2011, start of class. Using NetBeans 6.9.1, you are to write a Java program using OOP principles to accommodate the following functionality Assignment #4Objectives:Provide student with experience building arrays of objects Provide student with opportunity in doing file input and output.Provide student with exercises in learning UMLProvide student with exercises in Javadoc and its various formatsProvide student with exercises in searching and traversing the array of objects. Specifications: 1. Build an array of State objects. You are to develop a class named States from an external file, MyStates.Spring2011 , and create as many objects of this type – one object for each record (line) from the input file. Allocate your array size to 40. You will have to keep track of the actual number of objects in this array as you build it. Call this integer attribute numStates. This should be a staticprivate integer in the State class.You are not to alter the data, however, in any way.) Each state object will have properties as shown and defined individually as Strings, ints, or whathaveyou, as appropriate for each state object. Hint: you may use substring method in class String to parse as expected. Please note that the first several lines provide the layout of the data below. When you Save Target As to download this state file, you may eliminate those first lines. But you need the layout of information in your program in order to parse. Thus, only save into your project area a downloadof the data lines.2. Display Array. From main() you are to write code to display the array of objects to the screen – you must use toString(). This is to include a nice looking master header spanning the display line followed by nicely single-spaced columnsof state attributes aligned under the single column header. Text data is to be left justified; numeric data, always right justified with commas as appropriate.3. Copy Array of Objects to External File. Copy your array of objects to an external file. See slides for example. You will need FileWriter and appropriate methods as found in the slides.For the file output, only write the records. No header line. So the individual linesshould look like what you display in #2 above – nicely spaced out; no header. Note: this is not a print file you are creating.4. Scan and Total Populations. Using the array of State objects, you are to examine each state object and accumulate data. You are to total up the state populations per region. At the end of this array scan, you are to print out a header that says (see below) State Population By Region (centered) and underneath this you are to print out a column header. Then, you are to print the region name, the number of states in the region, and the average population of states in that region. Your format for these detail lines should appear as:State Population By Region <skip line>State Region Average Population per State <skip line>New England 6 321,123 (or whatever average population is)Middle Atlantic 5 x,xxx,xxxetc.(note the spacing; use the student examples and my formatting links provided on my web page)5. Print overall total. At the end of displaying these lines, you are to skip a couple of lines and display:Total State Population of the Indicated Regions is: (this will be a single line)<skip line>State Count nn 331,222,333 (or whatever you add up to)Note: State Count is the total number of states (or objects) and the population is merely the total of all populations.Note also: figure out an algorithm on how to center the header above. Hint: Start with the fact that you have 80 characters of print. Use the size of the text you want to print (string length??); etc…. 6. Search Requirement. You are to search through the entire array of State objects that are in regions 1 and 3. If any of those state populations exceed 5,000,000, you are to display: (for example)State Populations Exceeding 5,000,000 for Regions 1 and 3. (left justified)<skip a line>Region: New EnglandState: MassachusettsState population: x,xxx,xxx (include the commas!)<blank line>Region: SouthState: FloridaState capital: TallahasseeState population: 14,345,444<blank line>Region: WestState: CaliforniaState capital: SacramentoState population: 32,444,555Etc.Process the regions in ascending numerical order, that is, process region 1 before processing region 3. At the end of searching, you are to display the number of successful searches according to the format:<blank line>Summary Statistics:Number of State Populations Exceeding 5,000,000: <an integer>UMLYou are to include a UML class diagram. You may use Word or Power Point onlyNo other technology may be used!Use the examples in your 2551 text. Each class listed in your UML diagram must have attributes listed (name, type). Methods must be shown with visibility indicator, and number /type of arguments plus the return type.Connect all classes (label the associations). Use UML format not Java. See previous lectures and your text for examples. Remember: static methods / variables are underlined. Use proper connectors (associatins).‘Drag’ your UML design file into your P4 subfolder within your COP2551 desktop folder. It will be included in the zip file to me. All other files should also be included in this folder which also must include the initial States file too.Please note that this file MUST be included within your folder – not separately submitted.JavadocAll programming is to be accompanied by appropriate Javadoc. ALL methods are to have Javadoc comments preceding them (in your source code). Appropriate documentation for methods consists of a short description (single sentence or two) plus any parameters and any return types specified such as @params and @returns. Appropriate documentation for classes includes several sentences describing the purpose of the class. Include @author and any other documentation that assists indocumenting that particular class. (Of course, objects related to this class should be described via accompanying UML diagrams.)Javadoc generation: Use the link that says: Generation of Javadoc on my web page. From the Project window pane, right click on the projectname at the top of the pane. Select Properties (last choice in the drop down).
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