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java Programming Glossary: let'sJSP tricks to make templating easier? http://stackoverflow.com/questions/1296235/jsp-tricks-to-make-templating-easier As skaffman suggested JSP 2.0 Tag Files are the bee knees. Let's take your simple example. Put the following in WEB INF tags..
What does the ^ operator do in Java? http://stackoverflow.com/questions/1991380/what-does-the-operator-do-in-java in Java ^ in Java is the exclusive or xor operator. Let's take 5^6 as example decimal binary 5 101 6 110 xor 3 011 This..
Recommendations for a heap analysis tool for Java? [closed] http://stackoverflow.com/questions/2064427/recommendations-for-a-heap-analysis-tool-for-java favorite heap analysis tools e.g. jprofiler jmap ... . Let's keep it one tool per answer with a short list of pros and cons..
Why JSF calls getters multiple times http://stackoverflow.com/questions/2090033/why-jsf-calls-getters-multiple-times JSF calls getters multiple times Let's say I specify an outputText component like this h outputText..
Why do I need to override the equals and hashCode methods in Java? http://stackoverflow.com/questions/2265503/why-do-i-need-to-override-the-equals-and-hashcode-methods-in-java to override one then you need to override both of them. Let's analyze what whould happen if we override one but not the other..
How to retrieve and display images from a database in a JSP page? http://stackoverflow.com/questions/2340406/how-to-retrieve-and-display-images-from-a-database-in-a-jsp-page image jsp servlets jdbc share improve this question Let's see in steps what should happen To display an image in HTML.. as well. That should be it. It almost writes code itself. Let's start with HTML in JSP img src images foo.gif img src images..
http://stackoverflow.com/questions/2707322/what-is-null-in-java may be expensive to compute . There are also other uses. Let's take a real example from java.lang.System public static Console.. no problem with empty lines because an empty line null . Let's take another example this time from java.util.Map K V V get..
http://stackoverflow.com/questions/2750216/post-increment-operator-java keyword post increment share improve this question Let's break down your own argument According to the author j j is..
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 generic methods makes Java compiler and me very confused Let's first consider a simple scenario see complete source on ideone.com.. see if we can in fact invoke probablyIllegal in any way. Let's try the easy case first and choose the same type for the two.. but rather misunderstanding what List List really means. Let's first remind ourselves what it means that Java generics is invariant..
Where do Java and .NET string literals reside? http://stackoverflow.com/questions/372547/where-do-java-and-net-string-literals-reside that we have a object as well. That's the intern table. Let's take a look. 0 000 dumparray 035d2020 Name System.Object MethodTable..
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 exactly where the exception was thrown in the application. Let's have a look at the stack trace Exception in thread main java.lang.NullPointerException..
How to parse XML using the SAX parser http://stackoverflow.com/questions/4827344/how-to-parse-xml-using-the-sax-parser posting a short hander example. android.sax Implementation Let's start with the android.sax implementation. You have first have..
Difference between <context:annotation-config> vs <context:component-scan> http://stackoverflow.com/questions/7414794/difference-between-contextannotation-config-vs-contextcomponent-scan scan which can scan a package for targets to work on. Let's change the content of the XML config into the following entry..
How to implement a Map with multiple keys? http://stackoverflow.com/questions/822322/how-to-implement-a-map-with-multiple-keys uses multiple differently typed keys to access its values. Let's don't be too general let's say two keys Keys are guaranteed..
How to change text color in the JtextArea? http://stackoverflow.com/questions/9650992/how-to-change-text-color-in-the-jtextarea text color in the JtextArea I need to know how to do this Let's say I have a code in the jtextArea like this LOAD R1 1 DEC R1..
How do I remove objects from an array in Java? http://stackoverflow.com/questions/112503/how-do-i-remove-objects-from-an-array-in-java objects from an array in Java Given an array of n Objects let's say it is an array of strings and it has the following values..
Why is using a wild card with a Java import statement bad? http://stackoverflow.com/questions/147454/why-is-using-a-wild-card-with-a-java-import-statement-bad it is that it clutters your local namespace. For example let's say that you're writing a Swing app and so need java.awt.Event..
Choosing a Java Web Framework now? [closed] http://stackoverflow.com/questions/2084169/choosing-a-java-web-framework-now Things have surely changed in the mean time Yes and no But let's enter the presentation frameworks hell there is no single answer..
Download a file with Android, and showing the progress in a ProgressDialog http://stackoverflow.com/questions/3028306/download-a-file-with-android-and-showing-the-progress-in-a-progressdialog easily and delegate the hard work to the system. First let's see a utility method @param context used to check the device..
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 a List Float list so this shouldn't compile right In fact let's go back to the simpler LOLUnknowns1 two unbounded wildcards.. compile time error occurs due to incompatible types Now let's try some nesting List List can NOT CC List List String Rule..
How can we match a^n b^n with Java regex? http://stackoverflow.com/questions/3644266/how-can-we-match-an-bn-with-java-regex in a lookahead and f r e e s p a c i n g mode Now let's say that even though we don't want the b to be part of the match.. 1. Also as we anticipate having a more complicated pattern let's use x modifier for free spacing so we can make our regex more.. always fail. There are many ways around this but for now let's just make the self reference matching optional i.e. 1 . This..
Why does this go into an infinite loop? http://stackoverflow.com/questions/3831341/why-does-this-go-into-an-infinite-loop that's the definition of the postincrement operator. Now let's see how this behavior plays out in your example code MutableInt..
Creating random numbers with no duplicates http://stackoverflow.com/questions/4040001/creating-random-numbers-with-no-duplicates iteration you'd generate any number in the range 0..9 let's say you generate a 4. On the second iteration you'd then generate..
If profiler is not the answer, what other choices do we have? http://stackoverflow.com/questions/4387895/if-profiler-is-not-the-answer-what-other-choices-do-we-have of some persistent myths about performance profiling . But let's be positive. If one wants to find opportunities for speedup..
In Java, what is the best way to determine the size of an object? http://stackoverflow.com/questions/52353/in-java-what-is-the-best-way-to-determine-the-size-of-an-object best way to determine the size of an object For example let's say I have an application that can read in a CSV file with piles..
Sessions in struts2 application http://stackoverflow.com/questions/5509606/sessions-in-struts2-application will require the user to be logged in. Therefore let's create an interface called LoginRequired . Any action that implements..
How would you code an efficient Circular Buffer in Java or C# http://stackoverflow.com/questions/590069/how-would-you-code-an-efficient-circular-buffer-in-java-or-c-sharp
Difference between <context:annotation-config> vs <context:component-scan> http://stackoverflow.com/questions/7414794/difference-between-contextannotation-config-vs-contextcomponent-scan annotations is that it's supposed to remove the XML. So let's remove the XML definitions and replace them all with annotations..
JAR Bundler using OSXAdapter causing application to lag or terminate http://stackoverflow.com/questions/7519244/jar-bundler-using-osxadapter-causing-application-to-lag-or-terminate able to associate my application with a certain file type let's say .jarbundlerproblem I have to bundle my JAR file into an..
How to implement a Map with multiple keys? http://stackoverflow.com/questions/822322/how-to-implement-a-map-with-multiple-keys keys to access its values. Let's don't be too general let's say two keys Keys are guaranteed to be unique. Something like..
http://stackoverflow.com/questions/9010734/why-do-i-need-to-nest-a-component-with-rendered-some-in-another-component-w does NOT work. But if I nest the dataTable inside another let's say panelGroup it will work. h panelGroup id resultDisplay h..
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