Agenda. Announcements. Extreme Java G Session 2 - Main Theme Java Tools and Software Engineering Techniques

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1 Extreme Java G Session 2 - Main Theme Java Tools and Software Engineering Techniques Dr. Jean-Claude Franchitti New York University Computer Science Department Courant Institute of Mathematical Sciences 1 Agenda Summary of Previous Sessions Java Platform Architectures, and Files Traditional Java Tools Java Virtual Machine Java Project Management Approach Readings Class Project & Assignment #1b 2 Announcements Student accounts on i5.nyu.edu Extreme Java and extreme Programming (XP) Homeworks & Projects due dates TA assignments Java IDEs J2EE-Compliant Application Servers Assignment #2 3 1

2 Summary of Previous Sessions Review Java s Programming Language Features Course Logistics, Structure and Objectives Enterprise Software Foundations Application Performance Enhancements Limitations of the Java Environment Class Project & Assignment #1a & 1b 4 Key Platforms Features Resources Packaging Tools Environment 5 Java Platforms Architectures, and Files Runtime Environment Architecture Byte code verifier Class loader Runtime Execution Engine / optimizer API class files Native platform interface libraries File Types Source code files (see Class files Serialization files Archive files Manifest files 6 2

3 Java Virtual Machine (JVM) Byte Code Verifier Class Loader Runtime Execution Engine Just-in-time compiler Precompiler 7 Traditional Java Tools javac jar java javadoc jdb appletviewer 8 Java Interpreter Software that implements the JVM and runs Java applications Standalone or part of larger application (e.g., browser) Likely written in a native, compiled language Loads Java class files and interprets the compiled byte-code 9 3

4 Java Interpreter (continued) Verifies compiled classes loaded from untrusted sources Can turn Java byte-code into native machine instructions (dynamic/jit compilation) java [interpreter options] class name [program arguments] 10 Type of Java Applications Standalone Java application Runs independently Applet (embeddable program module) Part of a larger application Can use Sun s HotJava, or Netscape Navigator, or appletviewer (JDK) 11 Using java Class should be fully qualified class name (including class package if any) Shouldn t include.class file extension Searches for the class in current class path (-classpath option) 12 4

5 Using java (continued) Looks for main() method main method signature: public static void main ( String [ ] myargs ) myargs[0] is the first command line argument No need for argument count parameter (int argc = myargs.length) 13 Class Path Piece of environment information providing a list of places to look for some resources CLASSPATH: list of locations that can be searched for packages containing Java class files Used by Java interpreter and compiler 14 Class Path (continued) CLASSPATH includes directory names or the names of class archive files (.zip or.jar) Use colon separator (UNIX), or semicolon separator (DOS/Windows) Default paths:.:$jdk_home/classes:$jdk_home/lib/class es.zip (UNIX).;%JDK_HOME%\classes;$%JDK_HOME%\li b\classes.zip (Windows systems) 15 5

6 Java Compiler Turns Java source code into a compiled class containing JVM byte-code.java ->.class Allows one public class per file (file has same name as class) Storing the class files in alternate directory: use -d option 16 Applet Tag <applet attribute [attribute] > [<param parameter>] [<param parameter>] [HTML for non Java aware browsers] </applet> 17 Applet Tag (continued) attributes: width, height, code / object (serialized representation of applet) parameter: <param name=zone value=gmt> 18 6

7 Packaging: Java Archive (JAR) Files Can compress with ZLIB compression Can use pkzip to create and maintain JAR files jar is the java archive utility JAR file advantages: compression and access time 19 JAR Utility See handout on how to submit projects using zip/jar jar -cvf jarfile path [path] [ ] jar -tvf jarfile [path] [ ] jar -xvf jarfile [path] [ ] Alternative: MoaJar 20 JAR Utility (continued) jar adds META -INF/MANIFEST.MF packing list naming files along with cryptographic checksums jar -cvmf mymanifest.mf spaceblaster.jar spaceblaster Use javakey to sign a JAR file (see digital signature / certificate) 21 7

8 Java Project Management Approach Refer to the links on extreme Programming See the Sub-Topic presentation on Java Project Management 22 Assignment Readings Building Java Enterprise Systems: Part I (4) Slides and handouts posted on the course web site Assignment #1a: MetaJava VM installation/exploration Read Papers on Behavioral Reflection Project Framework Setup IBM4J/LotusXSL, Apache s Xerces/Xalan TreeViewer Sample Application 23 8

Extreme Java G Session 2 Main Theme Java Tools and Software Engineering Techniques. Dr. Jean-Claude Franchitti

Extreme Java G Session 2 Main Theme Java Tools and Software Engineering Techniques. Dr. Jean-Claude Franchitti Extreme Java G22.3033-006 Session 2 Main Theme Java Tools and Software Engineering Techniques Dr. Jean-Claude Franchitti New York University Computer Science Department Courant Institute of Mathematical