Intermediate Java Programming

Intermediate Java Programming What You Will Learn...................................................................................................................... 1  Understanding Object-Oriented Programming ............................................................................... 2  Working with Classes ............................................................................................................... 3  Understanding the Benefits of Object-Oriented Programming ................................................ 3  Working with Objects ..................................................................................................................... 4  Creating New Objects ............................................................................................................... 4  Using Variables to Reference Objects ...................................................................................... 5  Working with Dates ........................................................................................................................ 7  Creating Date Objects ............................................................................................................. 7  Using the GregorianCalendar Class ............................................................................... 8  Analyzing the Behavior of Reference Variables .................................................................... 15  Applying What You’ve Learned: Printing a Monthly Calendar ............................................. 17  Exercise 1 ..................................................................................................................................... 21  Using Formatters in the java.text Package .................................................................................... 23  Using the NumberFormat Class ......................................................................................... 23  Formatting Dates ..................................................................................................................... 30  Exercise 2: Formatting Numeric and Date Data ........................................................................... 33  Creating New Classes ................................................................................................................... 35  Defining a New Class ............................................................................................................. 35  Organizing the Class Body ..................................................................................................... 36  Declaring Member Variables (Fields) .................................................................................... 37  Writing Constructors ............................................................................................................... 39  Writing Methods ..................................................................................................................... 42  Creating New Objects Based on User-Defined Classes ......................................................... 46  Exercise 3: Writing Classes .......................................................................................................... 49  Expanding the Student Class ........................................................................................................ 52  Resolving Parameter Names in Constructors and Methods .................................................... 52  Declaring Static Members....................................................................................................... 53  Using Programming Logic to Implement Your Methods ....................................................... 56  Overloading Methods.............................................................................................................. 57  Streamlining Your Code ......................................................................................................... 58  Exercise 4: Expanding Your Classes ............................................................................................ 60  Working with Collections ............................................................................................................. 63  Creating a New Array List ...................................................................................................... 63  Intermediate Java Programming www.cetc.umsl.edu

Rev. B

Populating the Array List ........................................................................................................ 64  Retrieving the Number of List Elements ................................................................................ 66  Retrieving Array List Elements .............................................................................................. 66  Using Loops to Work with Collections .................................................................................. 67  Removing Array List Elements .............................................................................................. 68  Comparing Arrays and Array Lists ......................................................................................... 69  Exercise 5: Working with Collections .......................................................................................... 70  Designing Effective Applications ................................................................................................. 72  Identifying the Required Classes ............................................................................................ 72  Achieving the Goal of Encapsulation ..................................................................................... 73  Defining Fields........................................................................................................................ 73  Writing Methods ..................................................................................................................... 73  Writing Consistent Code ......................................................................................................... 74  Modifying Your Application .................................................................................................. 74  Applying What You’ve Learned: Building a Deck of Cards .................................................. 75  Exercise 6: Designing Effective Classes....................................................................................... 83  Understanding Inheritance ............................................................................................................ 84  Using Inheritance in Your Own Classes ................................................................................. 86  Using Polymorphic Variables ................................................................................................. 94  Using the Object Superclass ............................................................................................... 97  Working with Abstract Classes ............................................................................................... 97  Working with Final Classes (Optional) .................................................................................. 98  Exercise 7: Using Inheritance ....................................................................................................... 99  Organizing Your Classes into Packages ..................................................................................... 102  Documenting Your Classes......................................................................................................... 105  Documenting the Media Class ............................................................................................ 107  Using javadoc to Extract Comments ................................................................................ 108  Viewing Your Documentation .............................................................................................. 109  Documenting Subclasses ...................................................................................................... 109  Exercise 8: Using Packages and Documenting Your Classes .................................................... 111  Creating an JAVA Generic User Interface (GUI)....................................................................... 112  Appendix A: Java Programming Reference Books .................................................................... 113  Appendix B: Solutions to Exercises ........................................................................................... 114 

Intermediate Java Programming www.cetc.umsl.edu