http://java-programing.totalroute.net Blog About Java and Java Programing Fri, 22 Jun 2007 17:11:23 +0000 http://backend.userland.com/rss092 en 4.3.1 Primitive Types Numbers, characters, and boolean values are fundamental elements in Java. Unlike some other (perhaps more pure) object-oriented languages, they are not objects. For those situations where it's desirable to treat a primitive value as an object, Java provides " wrapper" classes (see Chapter 9). ... http://java-programing.totalroute.net/2007/06/22/431-primitive-types-numbers-characters-and-boolean-values/ * @see PotatoPeeler * @see PotatoMasher * @author John 'Spuds' Smith * @version 1.00, 19 Dec 1996 */ javadoc creates HTML format documentation of classes by reading the source code and the embedded comments. The author and version information is presented in the output, and the @see ... http://java-programing.totalroute.net/2007/06/22/see-potatopeeler-see-potatomasher-author/ The Java char type and String objects also support Unicode. But if you're concerned about having to labor with two-byte characters, you can relax. The String API makes the character encoding transparent to you. Unicode is also ASCII-friendly; the first 256 characters are defined to be identical ... http://java-programing.totalroute.net/2007/06/21/the-java-char-type-and-string-objects-also/ Aside from information for your own use, there are special values (in SDK 1.2) you can put in the manifest file that are useful. One of these, Main-Class , allows you to specify a class that contains a main( ) method: Main-Class: Game If ... http://java-programing.totalroute.net/2007/06/21/aside-from-information-for-your-own-use-there/ Manifest-Version: 1.0 Created-By: 1.2.1 (Sun Microsystems Inc.) Basically the file just describes its version number. In SDK 1.1, the manifest contains entries describing each item in the archive. In our case, the beginning of our manifest file looks like this (in SDK 1.1 only): ... http://java-programing.totalroute.net/2007/06/20/manifest-version-10-created-by-121-sun-microsystems-inc-basically/ Because we requested verbose output, jar tells us what it is doing: adding:spaceblaster/ (in=0) (out=0) (stored 0%) adding:spaceblaster/game/ (in=0) (out=0) (stored 0%) adding:spaceblaster/game/Game.class (in=8035) (out=3936) (deflated 51%) adding:spaceblaster/game/Planetoid.class (in=6254) (out=3288) (deflated 47%) adding:spaceblaster/game/SpaceShip.class (in=2295) (out=1280) (deflated 44%) adding:spaceblaster/images/ (in=0) (out=0) (stored 0%) adding:spaceblaster/images/spaceship.gif (in=6174) (out=5936) (deflated 3%) adding:spaceblaster/images/planetoid.gif ... http://java-programing.totalroute.net/2007/06/20/because-we-requested-verbose-output-jar-tells-us/ Compression makes downloading classes over a network much faster. A quick survey of the SDK distribution shows that a typical class file shrinks by about 40 percent when it is compressed. Text files such as arbitrary HTML or ASCII containing English words often compress by as much as ... http://java-programing.totalroute.net/2007/06/20/compression-makes-downloading-classes-over-a-network-much/ If you don't specify the CLASSPATH environment variable, it defaults to the current directory (.); this means that the files in your current directory are always available. If you change the class path and don't include the current directory, these files will no longer be accessible. ... http://java-programing.totalroute.net/2007/06/19/if-you-dont-specify-the-classpath-environment-variable/ .3 The Class Path The concept of a path should be familiar to anyone who has worked on a DOS or Unix platform. It's an environment variable that provides an application with a list of places to look for some resource. The most common example is ... http://java-programing.totalroute.net/2007/06/18/3-the-class-path-the-concept-of-a/ Choose SocketPermission from the first combo box. Then fill out the second text field on the right side with the network address that EvilEmpire will connect to. Finally, choose connect from the third combo box. Click on OK; you should see the new permission in the policy entry ... http://java-programing.totalroute.net/2007/06/18/choose-socketpermission-from-the-first-combo-box-then/