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 subject		updated
2865	Relationships 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
2419	Where 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
2114	Which 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
754	tar, 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

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