HELP! * GREY=local LOCAL HTML version of Foils prepared July 10 1996

Foil 37 Java Language -- Program Structure

From Basic Lectures on Java Language Applets Graphics Networking Trip to China and Icase Tutorial -- July 12-28 and June 10-13 96. by Geoffrey C. Fox * See also color IMAGE

Source code of a Java program consists of one or more compilation units, implemented as files with .java extension.
Each compilation unit can contain:
  • a package statement
  • import statements
  • class declarations
  • interface declarations
Java compiler (called javac) reads java source and produces a set of binary bytecode files with .class extensions, one for each class declared in the source file. For example, if Foo.java implements Foo and Fred classes, then "javac Foo.java" will generate Foo.class and Fred.class files.
Suppose that Foo implements an applet and Fred is an auxiliary class used by Foo. If HotJava/Netscape encounters a tag <APPLET code="Foo.class">, it will download Foo.class and Fred.class files and it will start interpreting bytecodes in Foo.class.



Northeast Parallel Architectures Center, Syracuse University, npac@npac.syr.edu

If you have any comments about this server, send e-mail to webmaster@npac.syr.edu.

Page produced by wwwfoil on Tue Feb 18 1997