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java Programming Glossary: becauseWhy 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 data into cache but my next thought was how silly that is because the array was just generated. What is going on Why is a sorted.. completely random the branch predictor is rendered useless because it can't predict random data. Thus there will probably be around..
Why JSF calls getters multiple times http://stackoverflow.com/questions/2090033/why-jsf-calls-getters-multiple-times use bean's constructor or initialization block for the job because it may be invoked multiple times if you're using a bean management..
What is a Null Pointer Exception? http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception contain a primitive value. Instead it contains a pointer because the type is Integer which is a reference type . Since you did..
How to upload files to server using JSP/Servlet? http://stackoverflow.com/questions/2422468/how-to-upload-files-to-server-using-jsp-servlet commons io.jar Your initial attempt failed most likely because you forgot the commons IO. Here's a kickoff example how the..
Is List<Dog> a subclass of List<Animal>? Why aren't Java's generics implicitly polymorphic? http://stackoverflow.com/questions/2745265/is-listdog-a-subclass-of-listanimal-why-arent-javas-generics-implicitly-p a cat to a litter of puppies Absolutely not. Illegal code because otherwise life would be Bad List Dog dogs new List Dog List.. cat. Now you can't add a Cat to a List extends Animal because you don't know it's a List Cat . You can retrieve a value and..
What is a raw type and why shouldn't we use it? http://stackoverflow.com/questions/2770321/what-is-a-raw-type-and-why-shouldnt-we-use-it though it's a member type of a parameterized type MyType E because it's static . mt1 and mt2 are both declared with actual type.. to java.lang.String Now we run into trouble at run time because names contains something that isn't an instanceof String . Presumably.. types . Are there no exceptions Unfortunately because Java generics are non reified there are two exceptions where..
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 submit element which you'd like to press programmatically because that's usually been used in the server side to distinguish if..
How to create a Java String from the contents of a file? http://stackoverflow.com/questions/326390/how-to-create-a-java-string-from-the-contents-of-a-file require memory several times the size of the file because for a short time the raw file contents a byte array the decoded..
JSTL in JSF2 Facelets… makes sense? http://stackoverflow.com/questions/3342984/jstl-in-jsf2-facelets-makes-sense recreated instead of retrieved from the view tree simply because the complete view tree isn't available yet at the point JSTL..
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 compatibility classpath and maintainability troubles because your webapp would not work when it's deployed to a servletcontainer..
How do I write a correct micro-benchmark in Java? http://stackoverflow.com/questions/504103/how-do-i-write-a-correct-micro-benchmark-in-java take any code path for the first time in the timing phase because the compiler may junk and recompile the code based on an earlier..
Java GUI listeners without AWT http://stackoverflow.com/questions/6255106/java-gui-listeners-without-awt was told yesterday that I shouldn't use AWT in my programs because it is outdated. I already know about light and heavyweight components..
Should I avoid the use of set(Preferred|Maximum|Minimum)Size methods in Java Swing? http://stackoverflow.com/questions/7229226/should-i-avoid-the-use-of-setpreferredmaximumminimumsize-methods-in-java-swi having special ideas about child sizes. Slightly because they should have implemented their needs with a custom LayoutManager..
Java String.equals versus == [duplicate] http://stackoverflow.com/questions/767372/java-string-equals-versus datos 0 ... NB the compare is done on 'usuario' because that's guaranteed non null in your code although you should..
http://stackoverflow.com/questions/13022754/java-bouncing-ball getSize g2d.fillOval p.x p.y size.width size.height Because this is driven by a single thread it is much more scalable...
How to get UTF-8 working in java webapps? http://stackoverflow.com/questions/138948/how-to-get-utf-8-working-in-java-webapps Petteri https localhost 8443 ID Users action search name ΠΆ Because ASCII characters are encoded in the same way both with latin1.. Cyrillic character ΠΆ is not understood at all in latin1. Because Tomcat is instructed to handle request parameters as UTF 8 it..
Convert a JSON string to object in Java? http://stackoverflow.com/questions/1395551/convert-a-json-string-to-object-in-java Object representation of the same in one line of code Because the current method is too tedious Object n create new setString..
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 the Books Headfirst Java and Headfirst Servlets and JSP . Because this topic web applications is so big and complicated I would..
Eclipse - no Java (JRE) / (JDK) … no virtual machine http://stackoverflow.com/questions/2030434/eclipse-no-java-jre-jdk-no-virtual-machine I downloaded Eclipse 64bit which looks for a 64bit JRE. Because I didn't have the 64bit JRE it threw the error which makes sense...
http://stackoverflow.com/questions/2707322/what-is-null-in-java type the type of the expression null which has no name. Because the null type has no name it is impossible to declare a variable..
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 return true Next check if it's a square modulo 255 3 5 17. Because that's a product of three distinct primes only about 1 8 of.. than 2 square roots notably this includes powers of 2. Because our actual square root is less than 2^32 at that point we can..
When to use LinkedList<> over ArrayList<>? http://stackoverflow.com/questions/322715/when-to-use-linkedlist-over-arraylist is that Vector is synchronized so it is thread safe. Because of this it is also slightly slower than ArrayList. So as far..
Java Strings: “String s = new String(”silly“);” http://stackoverflow.com/questions/334518/java-strings-string-s-new-stringsilly never to write code like this String s new String silly Because it creates unnecessary String objects. But instead it should.. which you should avoid saying String s new String Polish Because the literal Polish is already of type String and you're creating..
Why not use Double or Float to represent currency? http://stackoverflow.com/questions/3730019/why-not-use-double-or-float-to-represent-currency floating point currency share improve this question Because floats and doubles cannot accurately represent most base 10..
Integer wrapper objects share the same instances only within the value 127? http://stackoverflow.com/questions/5117132/integer-wrapper-objects-share-the-same-instances-only-within-the-value-127 127 java caching integer share improve this question Because it's specified by Java Language Specification. JLS 5.1.7 Boxing..
Why does JSF need to save the state of UI components on the server side? http://stackoverflow.com/questions/5474316/why-does-jsf-need-to-save-the-state-of-ui-components-on-the-server-side need to save the state of UI components on the server side Because HTTP is stateless and JSF is stateful. The JSF component tree..
How to find a button source in AWT (calculator homework) http://stackoverflow.com/questions/7441625/how-to-find-a-button-source-in-awt-calculator-homework text.equals Enter return button return null START Because I hate mice. public void keyPressed KeyEvent ke public void.. b.doClick public void keyTyped KeyEvent ke END Because I hate mice. public static void main String args SwingUtilities.invokeLater..
Something seems wrong with the layout, JButton showing unexpected behaviour at resize of the window http://stackoverflow.com/questions/9849950/something-seems-wrong-with-the-layout-jbutton-showing-unexpected-behaviour-at-r or removing components so you don't need revalidate . Because the background color is a bound property of the buttons you..
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