CSC 243 - Java Programming, Spring, 2009 Welcome to Java Programming! Tuesday, January 13, 2009

What are we planning to do? We will transport ourselves from C++ to Java programming in a series of graceful steps. We will use modular construction techniques, with the assistance of Java classes and interfaces. We will learn how to get leverage from the massive Java class library. We will learn to use programming tools such as Eclipse. We will enter the realm of graphical user interface (GUI) and other event-driven programming.

References http://cs.armstrong.edu/liang/intro7e/toc.html has downloads from our textbook. GNU make http://www.gnu.org/software/make/manual/ http://java.sun.com/javase/downloads/index.jsp docs. http://java.sun.com/javase/6/docs/ has on-line docs. http://java.sun.com/javase/6/docs/api/index.html class lib. /export/home/faculty/parson/JavaLang on bill.kutztown.edu Make sure that /usr/jdk/jdk1.6.0_02/bin is near the front of UNIX PATH. Follow instructions in the JavaShellSetup.pdf document (accessible via my home page at http://faculty.kutztown.edu/parson) to set up and verify your Java compilation environment

Java programs run on a Java Virtual Machine (JVM) Java source program, FILE.java javac –g FILE.java (creates FILE.class) java PACKAGE.FILE where PACKAGE is a subdirectory under ~/JavaLang This runs PACKAGE.FILE on an interpreted JVM.

Categories of Java Virtual Machines Java EE (Enterprise Edition) comes with enterprise level class libraries, for example, large database and server infrastructure Java SE (Standard Edition) is the typical configuration for non-corporate users, including single users Java ME (Micro Edition) is for embedded devices. It has a small and special-purpose class library.

Varieties of Java “programs” Stand-alone applications run like C++ programs. Applets run inside a web browser (GUI). Servlets run inside a web server (HTML). Java Frameworks can select and load Java plugins (components) at run time. Java can run on small footprint embedded devices (for example, cell phones).

First example Java program CountArgString counts distinct, non-overlapping occurrences of a string in a file /export/home/faculty/parson/JavaLang/week1/lecture1 Make sure you “cp –pr ~parson/JavaLang ~/JavaLang” to get JavaLang into your home directory Make sure CLASSPATH include your $HOME/JavaLang makefile drives execution of compile and test steps gmake build to compile Java files gmake test to run test cases gmake clean to clean up test output and compiled files