CONTENTS. INTRODUCTION xvii

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1 INTRODUCTION xvii SECTION I: AN INTRODUCTION TO JAVA FOR RPG PROGRAMMERS 1 CHAPTER 1: JAVA FOR RPG PROGRAMMERS 3 AS/400 LIBRARIES AND JAVA PACKAGES 3 IMPORT 6 A PROGRAM WITH CLASS 7 LET S START HERE 7 SUBROUTINES AND FUNCTIONS 8 DENONCOURT S RPG 9 IBM S RPG 10 GLOBAL VARIABLES 12 PROGRAM ENTRY 13 *INZSR AND CONSTRUCTORS 15 JAVA VIRTUAL MACHINE 16 JOB CONTROL 17 SUMMARY 18 vii

2 CHAPTER 2: OBJECT-ORIENTED RPG 19 RPG++ 20 PROCESSING SETS 23 BUSINESS OBJECTS 24 CHAPTER 3: AN INTRODUCTION TO BASIC JAVA SYNTAX 27 LOOPS 27 CASE 30 CONSTANTS 31 ARRAYS 32 COMPILE-TIME ARRAYS 33 STATIC 34 BASIC DATA TYPES 36 NUMERICAL JAVA CLASSES 37 FIXED DECIMAL ARITHMETIC 39 STRING HANDLING 41 DEFAULT OUTPUT 44 DYNAMIC ARRAYS 46 JAVA SYNTAX SUMMARY 48 CHAPTER 4: JAVA PROGRAMMING MODELS: APPLETS, APPLICATIONS, AND SERVLETS 49 APPLETS 49 INVOKING AN APPLET 54 AS/400 APPLET SERVING 54 JAVA APPLICATIONS 55 SERVLETS 58 DISTRIBUTED OBJECTS 60 APPLETS, APPLICATIONS, OR SERVLETS? 62 SECTION II: OBJECT-ORIENTED DESIGN 65 CHAPTER 5: OBJECT-ORIENTED PROGRAMMING WITH JAVA 67 OBJECT-ORIENTED ANALYSIS USE CASES 67 OBJECT DISCOVERY 68 THE PURCHASING PROBLEM DOMAIN 70 DESIGN WITH CLASS 70 viii

3 BEHAVIORAL RELATIONSHIPS 73 ABSTRACT DATA TYPES 74 CONSTRUCTION 74 CLASS VERSUS OBJECT 75 NO OBJECT IS AN ISLAND 76 CLASS ASSOCIATION 77 TIME SEQUENCE DIAGRAMS 79 THREE LEVELS OF OBJECT-ORIENTED PROGRAMMING 80 THINK OBJECTS 80 CHAPTER 6: STANDARD ENCAPSULATION STRATEGIES 81 THE ALARM CLOCK INTERFACE 83 PLAUSIBLE DENIABILITY 85 IRISH SETTERS 86 INFORMATION HIDING 89 THE THREADS OF TIME 89 TO SERVE AND TO PROTECT 90 FRIENDLY FUNCTIONS 92 CLASS SPECIFIERS 93 JAVA ENCAPSULATION ENCAPSULATED 94 CHAPTER 7: INHERITANCE 95 THE ROLES OF INHERITANCE 96 THE BASICS OF INHERITANCE 98 OVERRIDING 101 HIDE AND SEEK 102 OVERLOADED FUNCTIONS 104 IF YOU DO NOT HAVE A CONSTRUCTOR, ONE WILL BE APPOINTED FOR YOU 105 IMPLICIT CLASS CONSTRUCTION 106 EXPLICIT CLASS CONSTRUCTION 107 THE SHOULDERS OF GIANTS 108 CHAPTER 8: JAVA INTERFACES 109 INHERITANCE VERSUS INTERFACES 115 WHAT S THE BIG DEAL? 115 ix

4 EXTENSIBILITY 116 PLUGABILITY 116 THE MANY FACES OF AN INTERFACE 117 THE POWER OF INTERFACES 121 CHAPTER 9: ABSTRACT CLASSES 125 IMPLEMENTATIONS OF ABSTRACT CLASSES 126 POLYMORPHISM 131 DON T DO TODAY WHAT YOU CAN PUT OFF UNTIL TOMORROW 133 CHAPTER 10: JAVA POLYMORPHISM 135 USES OF POLYMORPHISM 137 THE OLD WAY 139 A REAL-WORLD EXAMPLE 142 DYNAMIC METHOD LOOKUP VERSUS BINDING 143 I WISH C++ HAD THAT MANUAL CONTROL 144 SUMMARY 145 CHAPTER 11: JAVA ERROR HANDLING FOR CL PROGRAMMERS 147 DESCRIBING ERRORS 148 MESSAGE GENERATION 151 ERROR HANDLING 152 ENFORCED ERROR HANDLING 153 THROWING ERRORS AROUND 155 FINALLY {JAVA ERROR HANDLING SUMMARIZED} 157 Section III: ACCESSING YOUR AS/ CHAPTER 12: INTRODUCTION TO IBM sjava TOOLBOX FOR THE AS/ PRODUCT INSTALLATION 162 ENHANCING PERFORMANCE 164 SUMMARY 164 CHAPTER 13: DB2/400 RECORD-LEVEL ACCESS FOR JAVA 167 SIX STEPS TO JAVA RECORD-LEVEL ACCESS 169 STEP 1: CONNECT TO AN AS/ x

5 STEP 2: SPECIFY THE FILE LOCATION 170 STEP 3: GET AND SET THE RECORD FORMAT 171 STEP 4: OPEN THE FILE 172 STEP 5: READ A RECORD 173 STEP 6: RETRIEVE FIELD VALUES 178 A COMPLETE EXAMPLE 180 ADD, UPDATE, AND DELETE 182 SUMMARY 184 CHAPTER 14: SQL ACCESS TO DB2/400 WITH JAVA DATABASE CONNECTIVITY 185 THE FOUR COMPONENTS OF JDBC 186 AN EXAMPLE JDBC APPLICATION 187 BE PREPARED AND CALL ME 193 PREPARED STATEMENTS 193 CALLABLE STATEMENTS 195 DATA ABOUT DATA 196 JDBC BATCH PROCESSING OF SQL STATEMENTS 202 READING BACKWARD 203 THE DYNAMIC CURSOR 205 RDB UPDATE FUNCTIONS VERSUS SQL STATEMENTS 206 SELECT SUM(JDBC) FROM CHAPTER 209 CHAPTER 15: INTEGRATING JAVA WITH AS/400 APPLICATIONS 211 SIX STEPS TO REMOTE PROGRAM CALL 211 STEP ONE: ESTABLISH AN AS/400 CONNECTION 212 STEP TWO: *ENTRY PLIST 212 STEP THREE: WHERE S THE PROGRAM? 217 STEP FOUR: THE PROGRAM CALL OBJECT 217 STEP FIVE: GO 218 STEP SIX: HOW D IT GO? 218 A STRATEGY FOR ENCAPSULATING AS/400 PROGRAM CALLS 222 OS/400 COMMAND INVOCATION 224 JAVA NATIVE INTERFACE 225 DATA QUEUES 227 xi

6 RPG PROGRAM CALL WITH PCML 229 PCML COMPLETE 231 USING PCML IN JAVA 233 JAR REQUIREMENTS 235 HONEY, CAN WE TALK? 235 SUMMARY 235 SECTION IV: OBJECT-ORIENTED STRATEGIES FOR MAPPING DB2/400 TO JAVA 237 CHAPTER 16: ENCAPSULATING DB2/400 DATA ACCESS INTO JAVA CLASSES 239 ENTITY ENCAPSULATION 240 CLASS ATTRIBUTES 241 DESIGN THE CLASS API 245 PROCESSING SETS 247 IMPLEMENTATION OF CRUD 250 WRITE, UPDATE, AND DELETE 252 UNIT TESTING 253 JAVADOC 254 MORE COMMENTS 258 DESIGN FLAWS 258 CHAPTER 17: AN ADVANCED STRATEGY FOR ENCAPSULATING DB2/400 ACCESS 267 SPECIFIC CODE 269 DESIGNING TO AN INTERFACE 270 RDBOBJECT IMPLEMENTATION 273 CONSTRUCTION 274 SINGLETON PROFILE 275 SET PROCESSING 277 CRUD: CREATE, READ, UPDATE, DELETE 280 THE DERIVED CLASS 283 ENFORCED FUNCTION IMPLEMENTATION 288 ADDITIONAL INTERFACES 291 USE OF THE CUSTOMER CLASS 291 POTENTIAL ENHANCEMENTS 292 xii

7 CHAPTER 18: USING JAVA ITERATORS 295 THE SQLITERATOR IMPLEMENTATION 297 SQLITERATOR USE 301 LOGICAL FILE SUPPORT 302 DDMITERATOR USE 308 SUMMARY 313 SECTION V: GRAPHICAL USER INTERFACE 315 CHAPTER 19: LEARN JAVA GUI PROGRAMMING IN 21 MINUTES 317 AWT CLASSES AS FOUNDATION CLASSES 318 THE AWT COMPONENT CLASSES 318 THE FOUR STEPS TO A JAVA GUI 319 TETRIS 325 EVENT HANDLING 326 INSIDER INFORMATION 329 LISTENER INTERFACES 330 THREE WAYS TO SKIN A CAT 333 HANDLING THE GUI SUMMARY EVENT 336 NOTHING WORTHWHILE IS EVER EASY 337 CHAPTER 20: USINGENCAPSULATED BUSINESS OBJECTS TO DEVELOP A GUI 339 DISPLAYCUSTOMER OVERVIEW 340 UPCOMING EVENTS 342 THE LABELS 346 THE LISTCUSTOMERS APPLICATION 349 SUMMARY 354 CHAPTER 21: DESIGNING PROFESSIONAL GUIs 355 GRIDS VERSUS SUBFILES 356 GRID CHOICES 357 MICROSOFT S AFC VERSUS SUNSOFT S JFC 358 THE JTABLE GRID 358 THE VIEW 361 THE DOCUMENT 361 POPULATE THE GRID 363 xiii

8 HEADERS 365 MINIMUM REQUIREMENTS 365 COLUMN ATTRIBUTES 366 READ ONLY 367 DB2/400 UPDATE 370 THE GRID VIEW 372 THE BOTTOM PANEL 373 IBM S JT400 TABLES 375 TABBED DIALOGS 376 TREES 378 EXPANDING SUBFILES 381 JFC AVAILABILITY 385 SWING VERSUS AWT 386 APPENDIX: SOFTWARE LOADING INSTRUCTIONS 395 JAVA DEVELOPMENT KIT 395 SWING/JFC 396 AS/400 TOOLBOX FOR JAVA 396 COMPILATION INSTRUCTIONS 397 EXECUTION 399 DEPRECATION ERRORS 399 GLOSSARY 401 OBJECT 402 CLASS/ABSTRACT DATA TYPE 402 CLASS METHOD/FUNCTION/ FUNCTION MEMBER/OPERATION/BEHAVIOR/MESSAGE 403 DATA MEMBER/ATTRIBUTE/CLASS FIELD 404 PARENT CLASS/SUPERCLASS 405 SUBCLASS/DERIVED CLASS/Iz 405 INTERFACE/JAVA INTERFACE/SIGNATURE 405 IMPLEMENTS 407 VISIBILITY/ACCESS SPECIFIER 408 INSTANTIATE/CREATE/CONSTRUCT 408 ASSOCIATE 409 CONTAINMENT/COMPOSITION 410 PERSISTENCE 410 xiv

9 REFERENCE LIST 411 Index 413 xv

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