By Lou Marco
As basic internet entry to info housed on company mainframes is speedy changing into a center company requirement, mainframe programmers have to easy methods to boost Java purposes to maintain velocity with turning out to be company wishes. targeting recommendations everyday to mainframe programmers, this ebook provides step by step counsel on the right way to use Java to entry dossier and database constructions universal to mainframe environments. After evaluating Java and mainframe languages comparable to COBOL and PL/I, Marco is going directly to disguise Java implementations for IBM's OS/390 and complicated Java programming innovations, together with Java periods and EJB.A must-read for someone who must supply clients with entry to enterprise facts through an internet interface, this publication is a logical better half to method 390 JCL (0-471-28309-6), our bestselling mainframe programming publication now in its fourth version.
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Extra resources for Developing Mainframe Java Applications
By eliminating pointer use, Java programs are not fodder for a host of memory related bugs. Tasks like dynamically allocating memory for various structures such as linked lists and trees are tedious, error-prone, and extremely dependent on the current execution environment. As you'll read in later chapters, Java handles memory management for you. Java detects when objects are no longer in use and automatically frees memory for later use in your program. As you've guessed, there's a ten-dollar phrase for this process— garbage collection.
These objects contain all their needed data and procedures. The object view of modeling software systems is based on the properties and behaviors of actual application entities. Comparatively, the old software design model of creating separate data models and structure charts seems archaic. Reusability . The object prophets make strong claims about software reusability. On the reusability issue, the prophets speak with a single voice. They say that only by using object technology can you, the programmer, create truly reusable code.
The world started to see Java applets appear in Web pages. Recall that the Web was still fairly new in 1995; those days, the corporate world did not allow Internet access on the job and only the enlightened few amongst us had an Internet connection at home. Even so, Sun realized that Java was a hit and cranked up their Java development efforts. Java had become worthy of coverage in several trade rags. Java usage began to spread over the Internet with applets appearing on Web page after Web page.