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java Programming Glossary: moreWhy is processing a sorted array faster than an unsorted array? http://stackoverflow.com/questions/11227809/why-is-processing-a-sorted-array-faster-than-an-unsorted-array words you try to identify a pattern and follow it. This is more or less how branch predictors work. Most applications have well..
Why JSF calls getters multiple times http://stackoverflow.com/questions/2090033/why-jsf-calls-getters-multiple-times it is trivial to notice that the getter is being called more than once per request twice or three times is what happened.. solely return the already prepared property and nothing more exactly as per the Javabeans specification . They should not..
What is the difference between JSF, Servlet and JSP? http://stackoverflow.com/questions/2095397/what-is-the-difference-between-jsf-servlet-and-jsp HTTP URL pattern which is configureable in web.xml or more recently with Java EE 6 with @WebServlet annotation. When a.. based view technology such as Facelets . Facelets is much more suited to JSF than JSP. It namely provides great templating..
How to use java.net.URLConnection to fire and handle HTTP requests? http://stackoverflow.com/questions/2793150/how-to-use-java-net-urlconnection-to-fire-and-handle-http-requests it when I would need the String concatenation operator more than twice. Firing a HTTP GET request with optionally query.. content binary and character data . The encoding is in more detail described in RFC2388 . String param value File textFile.. Last words The Apache HttpComponents HttpClient is much more convenient in this all HttpClient Tutorial HttpClient Examples..
GUI not working after rewriting to MVC http://stackoverflow.com/questions/3066590/gui-not-working-after-rewriting-to-mvc in the Model and no game logic in the View . This somewhat more complex game was designed to illustrate the same concepts. Addendum.. example below Model extends Observable for simplicity. A more common approach uses an EventListenerList as shown in the Converter..
How do servlets work? Instantiation, session variables and multithreading http://stackoverflow.com/questions/3106452/how-do-servlets-work-instantiation-session-variables-and-multithreading servlet context and setting session variables. Now if 2 or more users send request to this server then what happens to the session.. server able to differentiate between different users One more similar question if there are n users accessing a particular.. The HttpSession lives until it has not been used for more than the session timeout time a setting you can specify in web.xml..
How to avoid Java Code in JSP-Files? http://stackoverflow.com/questions/3177733/how-to-avoid-java-code-in-jsp-files are not unit testable. Maintainability per saldo more time is needed to maintain mingled cluttered duplicated code.. want to invoke the same Java code on every request less or more regardless of the requested page e.g. checking if an user is..
Design Patterns web based applications http://stackoverflow.com/questions/3541077/design-patterns-web-based-applications throws Exception You may want to make the Exception more specific with a custom exception like ActionException . It's..
How do I import the javax.servlet API in my Eclipse project? http://stackoverflow.com/questions/4076601/how-do-i-import-the-javax-servlet-api-in-my-eclipse-project Also note that for example Glassfish and JBoss AS are more than just a servletcontainer they also supports JSF EJB JPA..
http://stackoverflow.com/questions/4112686/how-to-use-servlets-and-ajax Asynchronous JavaScript and XML . However last years it's more than often Asynchronous JavaScript and JSON . Basically you.. format you can even get some steps further. It allows for more dynamics. First you'd like to have a tool to convert between..
What is an efficient way to implement a singleton pattern in Java? http://stackoverflow.com/questions/70689/what-is-an-efficient-way-to-implement-a-singleton-pattern-in-java equivalent to the public field approach except that it is more concise provides the serialization machinery for free and provides..
Unsupported major.minor version 51.0 http://stackoverflow.com/questions/10382929/unsupported-major-minor-version-51-0 to get a warning about bootstrap class path not being set. More information about this error is available at https blogs.oracle.com..
StringBuilder vs String concatenation in toString() in Java http://stackoverflow.com/questions/1532461/stringbuilder-vs-string-concatenation-in-tostring-in-java .append b .append b .append c .append c .append .toString More importantly given we have only 3 properties it might not make.. it into version 2 no performance difference whatsoever. More importantly given we have only 3 properties it might not make..
What to learn for making Java web applications in Java EE 6? [closed] http://stackoverflow.com/questions/1960280/what-to-learn-for-making-java-web-applications-in-java-ee-6 on Java EE 6 only and forget the other frameworks for now. More precisely I'd start with the Java EE 6 Web Profile and then..
What does the ^ operator do in Java? http://stackoverflow.com/questions/1991380/what-does-the-operator-do-in-java JLS 15.22.2 xor ^ 0 1 ^ F T 0 0 1 F F T 1 1 0 T T F More simply you can also think of xor as this or that but not both..
http://stackoverflow.com/questions/238036/java-html-parsing Now JTidy is maintained by a group of volunteers. More information on JTidy can be found on the JTidy SourceForge project..
http://stackoverflow.com/questions/252055/java-generics-wildcards
Fastest way to determine if an integer's square root is an integer http://stackoverflow.com/questions/295579/fastest-way-to-determine-if-an-integers-square-root-is-an-integer & 255 y 8 & 255 y 16 At this point y is between 0 and 511. More code can reduce it farther. To actually check if the residue..
Validating input using java.util.Scanner http://stackoverflow.com/questions/3059333/validating-input-using-java-util-scanner but it's not necessarily true the other way around. More often than not you'd want to do the more specific test before..
How to avoid Java Code in JSP-Files? http://stackoverflow.com/questions/3177733/how-to-avoid-java-code-in-jsp-files entirely depends on the sole purpose of the code logic. More than often this code is to be placed in a fullworthy Java class...
Multiple wildcards on a generic methods makes Java compiler (and me!) very confused http://stackoverflow.com/questions/3546745/multiple-wildcards-on-a-generic-methods-makes-java-compiler-and-me-very-confu ArrayList List String lolSome new ArrayList List Integer More snippets Here's yet another example with bounded nested wildcard..
JTable design to synchronize with back-end data-structure http://stackoverflow.com/questions/3590897/jtable-design-to-synchronize-with-back-end-data-structure user finish editing and then replace it with the old one. More over I need to validate the data for example from above Suppose..
What is a stack trace, and how can I use it to debug my application errors? http://stackoverflow.com/questions/3988788/what-is-a-stack-trace-and-how-can-i-use-it-to-debug-my-application-errors to see what might cause the NullPointerException here. More daunting example with library code Usually stack traces are..
Unicode equivalents for \w and \b in Java regular expressions? http://stackoverflow.com/questions/4304928/unicode-equivalents-for-w-and-b-in-java-regular-expressions Unicode whitespace. The Solution to All Those Problems and More To deal with this and many other related problems yesterday..
http://stackoverflow.com/questions/490091/java-generics h Hashtable v.get 2 Casting gets pretty old fast. More than that the compiler whines at you about unchecked casts...
Why spawning threads in Java EE container is discouraged? http://stackoverflow.com/questions/533783/why-spawning-threads-in-java-ee-container-is-discouraged is common for WebSphere and WebLogic as well as others More info here And here Also somewhat duplicates this one from this..
Virtual Memory Usage from Java under Linux, too much memory used http://stackoverflow.com/questions/561245/virtual-memory-usage-from-java-under-linux-too-much-memory-used and there are some steps that you can take to reduce that. More important is the amount of time that you spend in garbage collection..
What is the difference between an int and an Integer in Java and C#? http://stackoverflow.com/questions/564/what-is-the-difference-between-an-int-and-an-integer-in-java-and-c sitting at my local Borders sipping coffee and reading More Joel on Software for free when I came across Joel Spolsky saying..
java.net.SocketException: Connection reset http://stackoverflow.com/questions/62929/java-net-socketexception-connection-reset to do this but it is not unknown for commercial software. More commonly it is caused by writing to a connection that the other..
http://stackoverflow.com/questions/9864267/load-icon-image-exception ImageIO.read getClass .getResource resources icon.gif More info on as to where lies the difference between the two approaches..
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