1 | 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. |
2 | 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. |