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This page contains a lecture on the java tool (command).

java is a program that can execute (run) programs written in Java. java actually executes classes as found in so called class files (see bytecode above). The argument to java can be the qualified name of a compiled class which contains the special "main method". The java command starts the virtual machine (JVM) which will read the corresponding class file and execute the instructions of the bytecode in the file.

Example use

If you want to execute the class Hello, as found in the file, in the package org.exampleproject:

$ java org.exampleproject.Hello

Note, that the Hello class must define a special "main" method in order to be possible for the JVM to execute.

Slides and videos

  • Presentation: TODO
  • Source code: TODO
  • Video: TODO


Other pages on this Wiki about java

Further reading

  • TODO