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Java module J708
Packages
Exercises, examples and other material relating to training module J708. This topic is presented on public courses Learning to Program in Java, Java Bootcamp, Java Programming for the Web

Java applications often comprise a very large number of classes. In order to provide for management of all these classes, they are arranged into groupings known as packages, with each package containing a logical group of related classes.


Articles and tips on this subjectupdated
2865Relationships between Java classes - inheritance, packaging and others
When you're designing classes in Java, you need to consider their relationship with one another in various ways. • You need to consider class INHERITANCE - which classes are based on which other classes. For example, a Pet could be based on (i.e. extended from) an Animal. • You need to consider ...
2010-07-11
 
2419Where is my Java class?
Exception in thread "main" java.lang.NoClassDefFoundError: Gerald OK - so where did Java look, and where should it have looked? Java looks for classes in each of the locations in the CLASSPATH environment variable in turn - each of those locations being either a directory or a .jar file which contains ...
2009-09-24
 
2114Which Version of Java am I running?
Write a test program to use the getProperty method on System: public class Sample {   public static void main (String [] args) {   System.out.println("*** Hello Melksham ***");   System.out.println(System.getProperty("java.vm.vendor").toString());   System.out.println(System.getProperty("java.version").toString());   } } Compile ...
2009-04-02
 
754tar, jar, war, ear, sar files
Have you ever wondered why that are so many file extensions ending in "a r"? It's because the "ar" stands for archive, and it's such a reasonable way of naming file that the original tar which stands for tape archive was picked up by Sun and the Java community and transmuted into other file formats. tar ...
2006-06-13
 
Examples from our training material
Geraldine.java   Class and calling code - all in same file
Hattie.java   Calling a class in another package
Hilda.java   Calling a class - using import to save repeated package names
Isobel.java   packaged class for Geraldine / Hilda / Hattie demo
axford.java   Calling a class in current package
pack.java   Package class example
sherston.java   Importing a class from a package
sopworth.java   Calling a class in a subpackage
Background information
Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from [here].
Topics covered in this module
Overview.
Package directory structure.
Importing classes from a package.
Introduction to standard packages.
Complete learning
If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

Well House Consultants specialise in training courses in Java,Ruby, Lua, Python, Perl, PHP, and MySQL. We run Private Courses throughout the UK (and beyond for longer courses), and Public Courses at our training centre in Melksham, Wiltshire, England. It's surprisingly cost effective to come on our public courses - even if you live in a different country or continent to us.

We have a technical library of over 700 books on the subjects on which we teach. These books are available for reference at our training centre.


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