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java Programming Glossary: i.eHow to append text to an existing file in Java http://stackoverflow.com/questions/1625234/how-to-append-text-to-an-existing-file-in-java a BufferedWriter is recommended for an expensive writer i.e. a FileWriter and using a PrintWriter gives you access to println..
What is a Null Pointer Exception? http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception this question When you declare a reference variable i.e. an object you are really creating a pointer to an object. Consider..
getResourceAsStream() vs FileInputStream http://stackoverflow.com/questions/2308188/getresourceasstream-vs-fileinputstream in Java web applications. That's only portability trouble i.e. it runs in system X but not in system Y . The normal practice..
non-static variable cannot be referenced from a static context http://stackoverflow.com/questions/2559527/non-static-variable-cannot-be-referenced-from-a-static-context . For fields it's usually constants like car types i.e. something where you have a limited set which doesn't change..
JSF - get managed bean by name http://stackoverflow.com/questions/2633112/jsf-get-managed-bean-by-name of the scope when you're actually inside the FacesContext i.e. the current HTTP request has been served through the FacesServlet..
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 way to determine if a long value is a perfect square i.e. its square root is another integer . I've done it the easy.. by John D. Cook . You can observe that the last hex digit i.e. the last 4 bits of a perfect square must be 0 1 4 or 9. This..
When to use LinkedList<> over ArrayList<>? http://stackoverflow.com/questions/322715/when-to-use-linkedlist-over-arraylist but O n worst case as above remove int index is O n index i.e. removing last is O 1 Iterator.remove is O n index ListIterator.add.. an array list the remainder of the array needs to be moved i.e. copied . On the other side seeking in a LinkedList means following..
JSTL in JSF2 Facelets… makes sense? http://stackoverflow.com/questions/3342984/jstl-in-jsf2-facelets-makes-sense own f xxx and ui xxx tags which do not extend UIComponent i.e. everything except of f param and f selectItem s and all those.. see some real world examples where JSTL tags are helpful i.e. when really properly used during building the view see the..
Java Process with Input/Output Stream http://stackoverflow.com/questions/3643939/java-process-with-input-output-stream below. Whereby you can enter a command to the bash shell i.e. echo test and have the result echo'd back. However after the..
Difference between applicationContext.xml and spring-servlet.xml in Spring http://stackoverflow.com/questions/3652090/difference-between-applicationcontext-xml-and-spring-servlet-xml-in-spring defines the beans for the root webapp context i.e. the context associated with the webapp. The spring servlet.xml..
http://stackoverflow.com/questions/3655316/browser-cant-access-find-relative-resources-like-css-images-and-links-when-cal this problem is to make them relative to the domain root i.e. start with a . This way you don't need to worry about changing..
Java Timer vs ExecutorService? http://stackoverflow.com/questions/409932/java-timer-vs-executorservice TimerTask kill that one thread thus making Timer dead ... i.e. scheduled tasks will not run anymore. ScheduledThreadExecutor..
How to: generic array creation http://stackoverflow.com/questions/529085/how-to-generic-array-creation . GenSet knows explicitly what type of objects it contains i.e. its constructor was explicitly called with a Class E argument..
Calling awt Frame methods from subclass http://stackoverflow.com/questions/5665156/calling-awt-frame-methods-from-subclass a JPanel to your JApplet and do all your drawing on that i.e creating child controls etc. When feel like redrawing then call..
Java: checked vs unchecked exception explanation http://stackoverflow.com/questions/6115896/java-checked-vs-unchecked-exception-explanation this question Many people say that checked exceptions i.e. these that you should explicitly catch or rethrow should not..
How to reference components in JSF ajax? Cannot find component with identifier “foo” in view http://stackoverflow.com/questions/8634156/how-to-reference-components-in-jsf-ajax-cannot-find-component-with-identifier described but it's known that relative component IDs i.e. those not starting with are not only searched in the context..
@Inject to pass params to a CDI @Named bean via URL gives Jboss error on Netbeans http://stackoverflow.com/questions/10058852/inject-to-pass-params-to-a-cdi-named-bean-via-url-gives-jboss-error-on-netbean annotation works only in JSF @ManagedBean classes. I.e. in instances which are managed by JSF. It does not work in..
what does “/” mean in the method 'servletcontext.getRealPath' http://stackoverflow.com/questions/12160639/what-does-mean-in-the-method-servletcontext-getrealpath file system path. The represents the web content root. I.e. it represents the web folder as in the below project structure..
How to programmatically close a JFrame http://stackoverflow.com/questions/1234912/how-to-programmatically-close-a-jframe in the same way as a press of x would cause it to behave. I.e. supposing I were to extend WindowAdaptor and then add an instance..
How to round a number to n decimal places in Java http://stackoverflow.com/questions/153724/how-to-round-a-number-to-n-decimal-places-in-java double to a string which rounds using the half up method. I.e. if the decimal to be rounded is a 5 it always rounds up the..
Why JSF calls getters multiple times http://stackoverflow.com/questions/2090033/why-jsf-calls-getters-multiple-times should introduce lazy loading inside the getter method. I.e. if the property is null then load and assign it to the property..
Where can i find a list of all the reference implementations for JEE6? [closed] http://stackoverflow.com/questions/2296678/where-can-i-find-a-list-of-all-the-reference-implementations-for-jee6 reference implementation for every component of Java EE 6 I.e. GlassFish is the reference container Hibernate Validator for..
getResourceAsStream() vs FileInputStream http://stackoverflow.com/questions/2308188/getresourceasstream-vs-fileinputstream in java.io are dependent on the current working directory. I.e. the directory from which the JVM in your case the webserver..
http://stackoverflow.com/questions/2349633/servlets-doget-and-dopost the servlet's doGet is used to preprocess a request. I.e. doing some business stuff before presenting the HTML output.. The servlet's doPost is used to postprocess a request. I.e. gathering data from a submitted HTML form and doing some business..
Analogues of Java and .NET technologies/frameworks http://stackoverflow.com/questions/2526024/analogues-of-java-and-net-technologies-frameworks for MTS COM mail message queue persistence and more. I.e. only a simple web server for pure Classic ASP . share improve..
Get query from java.sql.PreparedStatement http://stackoverflow.com/questions/2683214/get-query-from-java-sql-preparedstatement complete SQL by just calling PreparedStatement#toString . I.e. System.out.println preparedStatement To my experience the ones..
Eclipse: Attach source/javadoc to a library via a local property http://stackoverflow.com/questions/300328/eclipse-attach-source-javadoc-to-a-library-via-a-local-property to associate source javadoc with it locally in Eclipse. I.e. there should be some local setting for example an entry in..
How to get backspace \b to work in Eclipse's console? http://stackoverflow.com/questions/3095986/how-to-get-backspace-b-to-work-in-eclipses-console How do I get Eclipse to display the backspace properly I.e. let it remove the previous character. This is actually no showstopper..
What are the pros and cons of the leading Java HTML parsers? http://stackoverflow.com/questions/3152138/what-are-the-pros-and-cons-of-the-leading-java-html-parsers the possibility to act like a webbrowser programmatically. I.e. enter form values click elements invoke JavaScript etcetera...
How does autowiring work in spring? http://stackoverflow.com/questions/3153546/how-does-autowiring-work-in-spring means that the context instantiates the objects not you. I.e. you never make new UserServiceImpl the container finds each..
Where do Java and .NET string literals reside? http://stackoverflow.com/questions/372547/where-do-java-and-net-string-literals-reside table holds a reference to the instance on the heap. I.e. interned strings are not collected during GC because the interned..
C# version of java's synchronized keyword? http://stackoverflow.com/questions/541194/c-sharp-version-of-javas-synchronized-keyword c# have its own version of the java synchronized keyword I.e. in java it can be specified either to a function an object..
how to change UI depending on combo box selection http://stackoverflow.com/questions/6432170/how-to-change-ui-depending-on-combo-box-selection combo is checked and another group of controls otherwise. I.e. I need 2 layers and I need to switch between them when combo..
Synchronization of non-final field http://stackoverflow.com/questions/6910807/synchronization-of-non-final-field changes the same section of code may be run in parallel . I.e. if one thread runs the code in the synchronized block and someone..
http://stackoverflow.com/questions/7196889/swingutilities-invokelater what this method is for. Swing is basically thread unsafe. I.e. all interaction with that API needs to be performed on a single..
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