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Java Compiler - needs all classes, compiles them all too

Remember that when you compile a java source file ...

a) You must have the classes it will use when it runs available to the compiler so that it can check (a bit frustrating at times if you're compiling on one machine but going to be running on another)

b) If you supply only java course code for some of the classes used within the class you're compiling, or have updated the sources of those used classes, Java will automatically recompile them. (this can be a bit confusing when you see an error message referring to "line 65" and don't even have a line 65 in the file you've asked to be compiled - the error being in one of the other files)

Here's an example where I compiled a "Sales" application on last week's Java Course:

Dorothy:c2 grahamellis$ ls
Period.java Product.java Sales.java Single.java
Dorothy:c2 grahamellis$ javac Sales.java
Dorothy:c2 grahamellis$ ls
Period.class Product.class Sales.class Single.class
Period.java Product.java Sales.java Single.java
Dorothy:c2 grahamellis$


See that running here

(written 2008-03-03)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
A502 - Web Application Deployment - Java - Basic Tools
  [4412] Java -making sure you have the right versions - (2015-02-02)
  [3819] Packing a tar, jar or war file - best practise - (2012-07-26)
  [3151] Disassembling Python and Java - previously compiled code - (2011-01-29)
  [2859] Using java, javac, jar, and CLASSPATH - a simple example - (2010-07-07)
  [2422] Looking inside Java classes - javap and javadoc - (2009-09-25)
  [2153] Class Loading and Variable Conversion in Java - (2009-05-02)
  [1909] javax.servlet cannot be resolved - how to solve - (2008-11-26)
  [1771] More HowTo diagrams - MySQL, Tomcat and Java - (2008-08-24)
  [1192] What are WEB-INF and META-INF directories? - (2007-05-18)
  [1082] Straight from the .jar - (2007-02-16)
  [754] tar, jar, war, ear, sar files - (2006-06-10)

J606 - Java Roadmap - Beyond the Fundamentals
  [4305] Learning to program in Java - yes, we can help. - (2014-09-26)
  [3043] Gathering information - logging - with log4j. First steps. - (2010-11-12)
  [2036] Java Tag Libraries / how they work / Tomcat Deployment - (2009-02-11)
  [1910] Java - Generics - (2008-11-27)
  [1049] Java 6, Apache Tomcat 6. - (2007-01-21)


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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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