By Lou Marco
As easy internet entry to facts housed on company mainframes is quickly changing into a center company requirement, mainframe programmers have to how one can boost Java purposes to maintain velocity with turning out to be company wishes. concentrating on techniques universal to mainframe programmers, this e-book offers step by step advice on tips on how to use Java to entry dossier and database constructions universal to mainframe environments. After evaluating Java and mainframe languages resembling COBOL and PL/I, Marco is going directly to hide Java implementations for IBM's OS/390 and complicated Java programming ideas, together with Java periods and EJB.A must-read for someone who must offer clients with entry to enterprise info through an online interface, this booklet is a logical better half to method 390 JCL (0-471-28309-6), our bestselling mainframe programming publication now in its fourth variation.
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Extra resources for Developing Mainframe Java Applications
1 DOS window after compiling and running the sort. Page 17 My guide explains that Sun provides a base set of tools, which includes the compiler. Other vendors committed to Java provide Java Virtual Machines, or JVM's, bytecode interpreters, and applet viewers. She tells you that the standard Java Development Kit, or JDK, includes a documentation generator (javadoc), a java debugger (jdb), other tools dealing with system security (javakey), and a way of disassembling Java classes/bytecode into Java source (javap).
The program you've examined makes sense in a macro sort of way. However, you're battle-hardened enough to realize that every programming language has its quirks and oddities and that the language syntax just have to be learned. In the middle of your reflections, something odd catches your eye. You can't help notice your humble Java guide leafing through some IBM language reference manuals. When you ask her what she needs to know, she replies that she would like to know a bit more about programming language constructs in COBOL, PL/I, and REXX.
The block construct helps to define variable visibility. Also, the block construct is required when more than one statement follows an if statement or a loop construct. Even a small Java program can contain numerous braces, she says. The visibility of these variables may be defined by curly braces; variables declared within a pair of braces are known within those braces. Some cases exist where a variable is declared within a statement. In this case, that variable is visible only in that statement.