Java™ Application Development on Linux - Dator

7.4 Compiling Our Simple <strong>Application</strong> with gcj183TIPThe source code for FetchURL can be found in Example 3.30.Example 7.1 Compiling and running FetchURL with gcj$ gcj -o furl --main=FetchURL FetchURL.java$ ./furl http://www.multitool.net/pubkey.htmlhttp://www.multitool.net/pubkey.html:Michael Schwarz's Public GPG keyMichael Schwarz's Public GPG Key-----BEGIN PGP PUBLIC KEY BLOCK-----Version: GnuPG v1.0.7 (GNU/Linux)mQGiBDuv6IQRBACn1TIWUXiEuZtfR+0Lqx6tYBAzIRpljL42O6r5nKHmndsWV71eFUnhQpQIf+bNGGPMEt0g0vFpD6YWKP4uIEh2o+u1iyIIMs5QH3iqp8kFjbtVZa21.........etc.We already explained the -o switch which names the resulting binary. Theother switch we use here is --main which specifies the class containing themain() that should be run when the binary is invoked. Remember that everyJava class may contain a main(). In a multiclass program, the binary needs toknow which main() to run when the binary is executed.Remember that FetchURL is in the default package, 11 so you simplytype the class name as the argument to --main. However, if the class is in anondefault package, the fully qualified name must be used.11. Any class without a package declaration is in the default package.