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mpiler Warnings ====== ===== Unchecked Cast using Class.forName ===== I have a codebase that uses the the... xy Pattern]] to allow dynamic lookups of delegate classnames at runtime. Typically, I use a utility method to retrieve the delegate class name from my database using a key, and then use the ''Class.forName'' method to retrieve the class object. Here's a very simple example, without the utility function

====== Java Class Loaders ====== Most java programs don't need to manipulate the JVM class loader. But t... re are circumstances when a program needs to load classes in a non-standard way. For example: classes c... e encrypted on disk. In either case, the default class loader must be replaced with a special-purpose on... esired behavior. So, how do we implement our own classloader? ===== Implementing a Class Loader =====

Songs. Here are the simplified versions of those classes: <code java 1> /*..package and import statements here..*/ public class Artist { private transient Nodeid neoid; @neo(index=true) private ... /*..package and import statements here..*/ public class Album { private transient Nodeid neoid; @... /*..package and import statements here..*/ public class Song { private transient Nodeid neoid; @n

So we enrolled in [[http://training.petsmart.com/classes_beginner.shtml|Beginner Education]] classes at ... on Banfield Plans]]. We started taking obedience classes (they call them "puppy classes") at PetSmart. ... got a treat instead. This seemed fairly easy in class. Obedience topic #6: "Drop it". Similar to the... o learn, so they merit more time. A few of our classmates have dropped out by now. Sad situation, but

/nowiki>''. <code java> /** * The HelloWorldApp class implements an application that * simply displays "Hello World!" to the standard output. */ class HelloWorldApp { public static void main(String... enerated inline HTML)'; </php> <PHP> echo '<table class="inline"><tr><td>The same, but inside a block lev... ; echo '(inline HTML)'; </php> <PHP> echo '<table class="inline"><tr><td>The same, but inside a block lev

l need to add a package statement and located the class in the appropriate directory in your classpath. ... t java.text.SimpleDateFormat; import java.util.*; class threads { public static String[] names = { "... new T1(i, names[i]); t.start(); } } } class T1 extends Thread { public int threadID =

let]] * [[assert_example|Assert Example]] * [[class_loaders|Class Loaders]] ====== Java Resources =

couldn't find anything, so I wrote my own. This class parses an XML file and validates it against its D... and that the document matches its DTD. It uses classes from the [[http://xerces.apache.org/|Apache Xer... mport org.xml.sax.*; import javax.xml.parsers.*; class XMLValidator implements ErrorHandler { private b... ing filename) { try { // setup SAX parser Class.forName("org.apache.xerces.parsers.SAXParser");

====== Assert example ====== Assertions are a debated topic in Java. They were implemented in such a way that they throw JVM Errors rather than Exceptions. This means they halt your program at the point of the assertion failure. Here is an example: <code java> package com.freyer.test; public class AssertionTest { /** * @param args * No args for this example */ public static void main(String[] args) { String s = null; // test the proper behavior of the method say("hello"); // test the improper behavior of the method say(s); } private static void say(String s) { assert s != null : "string is null"; System.out.println(s); } } </code> In this code, the line containing ''say("hello");'' will cause the assertion in the ''say'' method to be true and allow the program to function normally. But the line containing ''say(s);'' will cause the assertion to fail because variable ''s'' is null. So how can you use assertions in a production application without possibly halting it when something goes wrong? With a JVM flag. The JVM provides a means to enable and disable assertions, as follows: java -disableassertions com.freyer.test.AssertionTest --> disable all assertions java -da com.freyer.test.AssertionTest --> short-hand java -da:com.freyer.test... com.freyer.test.AssertionTest --> disable assertions by package name java -da:AssertionTest com.freyer.test.AssertionTest --> disable assertions by class name or java -enableassertions com.freyer.test.AssertionTest --> enable all assertions java -ea com.freyer.test.AssertionTest --> short-hand java -ea:com.freyer.test... com.freyer.test.AssertionTest --> enable assertions by package name java -ea:AssertionTest com.freyer.test.AssertionTest --> enable assertions by class name This syntax allows you to active and deactivate assertions globally, by package, or by classname. For greater details, see the JVM docs.

javafxc, javafx, javafxdoc * "Time" is a first-class function, so KeyFrame animation isi provided to m... s to the JVM * scripting languages become first-class citizens in the JVM * annotations become more p

l calendar building tools. Written in 2001, this class provides mathematical information to calendar sys... ava.util.Date; import java.util.Calendar; public class DateTools { public static String days[] =

t org.neo4j.kernel.EmbeddedGraphDatabase; public class Neo4JPerformanceExercise { //static constant... ivate static final String ZIP_KEY = "zip"; //class variables private static GraphDatabaseService

is servlet depends on my [[technology:datetools]] class. <code java> /** * Insert the type's descriptio... o.*; import java.util.*; import DateTools; public class CFWebCalendar extends javax.servlet.http.HttpServ

with a user-defined format: ps -eo pid,tid,class,rtprio,ni,pri,psr,pcpu,stat,wchan:14,comm The im