source codę description of class X
The source filename (withoul the . j ava exten$ion) must be ihe same as the class name.
X. java corrpilalion
X.class
The conrpiled class is put into a lile with the same name, but with the .class extension.
FIGURĘ 3.4 The relationshgt between source codę flenanies, class nanieś, and bytecode Senanies