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Comprehensive Guide to UML Class Diagrams and Java Method Implementation

This resource provides an in-depth overview of UML class diagrams, focusing on basic class structures, access modifiers, and method declarations. You'll learn the importance of JavaDoc comments for documenting methods, how to create UML diagrams, and the significance of implementing methods in Java classes. The guide emphasizes best practices for code documentation and testing, ensuring your code is clean and maintainable. Contact Kalpa Gunaratna at Knoesis for more details during office hours or by email.

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Comprehensive Guide to UML Class Diagrams and Java Method Implementation

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  1. CS 241 – Computer Programming IILab KalpaGunaratna – kalpa@knoesis.org http://knoesis.wright.edu/researchers/kalpa/

  2. Contact • Contact by e-mail • kalpa@knoesis.org • Office hours • 376 Joshi • Mondays & Wednesday 3:00 pm – 4:00 pm

  3. UML class diagram tips…. • Basic class structure. • Access modifiers • + public, - private, # protected Class name <name> Variable declarations <access modifier>< <name> : <type> Method declarations <access modifier><name> (<name> : <type>) : <type>

  4. Java class and equivalent UML Class • Example : MyClass Public Class MyClass { Private int x; Public String y; Private void setVal(int z) { x = z; } Public String getName() { return y; } } - x : int + y : String + setVal(z : int) + getName() :String

  5. Comments • // - single line comment • /* */ - multiple line comments • /** */ - javadoc comments • Example JavaDoccommnet /** Takes input value y and calculates fixed amount and returns the calculated value. Pre-condition: value should be an integer of the range 1 – 9 Post-condition: value is equal to the expected amount @param y input integer value @return returns calculated value */ Public intcalcValue(int y) { return 5; }

  6. In lab • Draw UML class diagram and explain during the lab. • Put your method signature only into java class and should compile without any error. • All methods should have JavaDoc comment and inline comments or comment blocks. • UML and class should have all the methods listed in the assignment page.

  7. Post lab • Implement your stubbed java class. • Must have javadocs and comments as in in lab. • Call your methods and test whether they are working as mentioned in javadocs.

  8. enum • You can type enum with whatever name you want to use, lets say you need days of week to be represent in constants, enum Days{MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY}; • When you want to access MONDAY, use Days.MONDAY • See example in assignment. • More information and how to use enum: http://download.oracle.com/javase/tutorial/java/javaOO/enum.html

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