java Programming Glossary: oneWhy 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 it alternates then you alternate your guesses. If it goes one way every 3 times you guess the same... In other words you try.. ... completely random hard to predict So what can be done If the compiler isn't able to optimize the branch into a conditional..
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 That is there should not be any trailing zeroes. I know one method of doing this is to use the String.format method String.format..
Why JSF calls getters multiple times http://stackoverflow.com/questions/2090033/why-jsf-calls-getters-multiple-times multiple times Let's say I specify an outputText component like this h outputText value # ManagedBean.someProperty If.. ValueExpression#getValue . This will normally be invoked one or two times per JSF request response cycle depending on whether.. JSF request response cycle depending on whether the component is an input or output component learn it here . However this..
Overriding equals and hashCode in Java http://stackoverflow.com/questions/27581/overriding-equals-and-hashcode-in-java must be same as b.hashCode . In practice If you override one then you should override the other. Use the same set of fields..
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 to distinguish if a button was pressed and if so which one . You can also cast the obtained URLConnection to HttpURLConnection.. the Servelt 3.0 approaches. Last words The Apache HttpComponents HttpClient is much more convenient in this all HttpClient..
How to call SOAP web service in Android http://stackoverflow.com/questions/297586/how-to-call-soap-web-service-in-android standard web services. The web service is just basically one created in NetBeans . I would like to have IDE support for generating.. contact a WSDL based web service from an Android based phone. java android web services soap wsdl share improve this question..
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 ResultReceiver and IntentService . ResultReceiver is the one that will allow us to update our thread from a service IntentService..
GUI not working after rewriting to MVC http://stackoverflow.com/questions/3066590/gui-not-working-after-rewriting-to-mvc I've modified the original example to show how MVC allows one to enhance the View without changing the nature of the Model.. import java.awt.Color import java.awt.Component import java.awt.EventQueue import java.awt.Graphics import.. size this.color color @Override public void paintIcon Component c Graphics g int x int y Graphics2D g2d Graphics2D g g2d.setRenderingHint..
How do servlets work? Instantiation, session variables and multithreading http://stackoverflow.com/questions/3106452/how-do-servlets-work-instantiation-session-variables-and-multithreading session anymore. The servletcontainer will create a new one. On the other hand the session cookie on the client side has..
A better Java JSON library? [closed] http://stackoverflow.com/questions/338586/a-better-java-json-library better Java JSON library closed Can anyone recommend a good Java JSON library better than the one from.. anyone recommend a good Java JSON library better than the one from http json.org I've also found JSON lib which definitely..
Design Patterns web based applications http://stackoverflow.com/questions/3541077/design-patterns-web-based-applications few entities on my home page and corresponding to each one of them we have few options like add edit and delete. Earlier.. few options like add edit and delete. Earlier I was using one Servlet per options like Servlet1 for add entity1 Servlet2 for.. you choose the responsibility of a servlet. Should we have one Servlet per entity which will process all it's options and forward..
Can a progress bar be used in a class outside main? http://stackoverflow.com/questions/4637215/can-a-progress-bar-be-used-in-a-class-outside-main to have the progress bar tied to. Here is an example of one of the called classes each class is similar but different enough.. e int iterations int MP M1Start M2Start Create all components progressFrame new JFrame Calculation Progress progressFrame.setSize.. progressBar new JProgressBar 0 iterations Add components to pane pane.add progressBar Position controls X Y width..
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 a reputable paper on JVMs and micro benchmarking. A good one is Brian Goetz 2005 . Do not expect too much from micro benchmarks..
http://stackoverflow.com/questions/5621338/how-to-add-jtable-in-jpanel JPanel whose layout is null . JPanel contains other components. I have to add JTable at proper position. java swing layout.. on using layout managers. See the Laying Out Components Within a Container lesson for further details. One aspect.. well by the tutorial is that of nested layouts putting one layout inside another to get complex effects. The following..
The Use of Multiple JFrames, Good/Bad Practice? http://stackoverflow.com/questions/9554636/the-use-of-multiple-jframes-good-bad-practice icons in their task bar when expecting to see only one. Plus the side effects of the coding problems.. A nightmare.. are any number of ways of displaying many elements in one GUI e.g. CardLayout short demo. . Good for Showing wizard like.. tree etc. selections for items that have an associated component. Flipping between no component and visible component. JInternalFrame..
How to read a single char from the console in Java (as the user types it)? http://stackoverflow.com/questions/1066318/how-to-read-a-single-char-from-the-console-in-java-as-the-user-types-it There's also an interesting discussion thread here . One of the suggestions is to use JNI. Again that's not very portable...
http://stackoverflow.com/questions/148681/unloading-classes-in-java to the classloader itself need to go the way of the dodo. One possible solution to your problem is to have a Classloader for..
PreparedStatement IN clause alternatives? http://stackoverflow.com/questions/178479/preparedstatement-in-clause-alternatives values due to SQL injection attack security issues One placeholder represents one value rather than a list of values...
Classpath including JAR within a JAR http://stackoverflow.com/questions/183292/classpath-including-jar-within-a-jar there are two ways that I know of to do that. The first is One Jar which uses a special classloader to allow the nesting of..
Why JSF calls getters multiple times http://stackoverflow.com/questions/2090033/why-jsf-calls-getters-multiple-times I googled a bit and figured this is a known issue. One workaround was to include a check and see if it had already..
Why doesn't Java allow overriding of static methods? http://stackoverflow.com/questions/2223386/why-doesnt-java-allow-overriding-of-static-methods considerations driving Java's design that impacted this. One was a concern with performance there had been a lot of criticism..
Populating child dropdownlists in JSP/Servlet http://stackoverflow.com/questions/2263996/populating-child-dropdownlists-in-jsp-servlet select name dd3 option Please select parent option select One caveat is however that this may become unnecessarily lengthy..
http://stackoverflow.com/questions/2707322/what-is-null-in-java String line while line reader.readLine null process line One can design the API so that the termination condition doesn't..
http://stackoverflow.com/questions/2883355/how-to-render-pdf-in-android share improve this question Some phones like the Nexus One come with a version of Quickoffice pre installed so it may be..
How do servlets work? Instantiation, session variables and multithreading http://stackoverflow.com/questions/3106452/how-do-servlets-work-instantiation-session-variables-and-multithreading the server able to differentiate between different users One more similar question if there are n users accessing a particular..
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 might be many gigabytes of RAM. Character encoding One thing that is missing from the sample in the original post is..
Generating random numbers in a range with Java http://stackoverflow.com/questions/363681/generating-random-numbers-in-a-range-with-java problem. java range random share improve this question One standard pattern for accomplishing this is Min int Math.random..
How to deal with “java.lang.OutOfMemoryError: Java heap space” error (64MB heap size) http://stackoverflow.com/questions/37335/how-to-deal-with-java-lang-outofmemoryerror-java-heap-space-error-64mb-heap you need or to reduce the amount of memory you are using. One common mistake with garbage collected languages such as Java.. referenced or to not allocate them in the first place. One option which I have used in the past is JMP http www.khelekore.org..
What is reflection, and why is it useful? http://stackoverflow.com/questions/37628/what-is-reflection-and-why-is-it-useful .getMethod doSomething null method.invoke foo null One very common use case in Java is the usage with annotations...
Differences between HashMap and Hashtable? http://stackoverflow.com/questions/40471/differences-between-hashmap-and-hashtable HashMap allows one null key and any number of null values. One of HashMap's subclasses is LinkedHashMap so in the event that..
Java Timer vs ExecutorService? http://stackoverflow.com/questions/409932/java-timer-vs-executorservice can use ScheduledThreadExecutor instead of Timer do so. One more thing... while ScheduledThreadExecutor isn't available..
How can an app use files inside the JAR for read and write? http://stackoverflow.com/questions/5052311/how-can-an-app-use-files-inside-the-jar-for-read-and-write If it is changed store the altered file in another place. One common place is a sub directory of user.home . When checking..
Good Java graph algorithm library? http://stackoverflow.com/questions/51574/good-java-graph-algorithm-library give a try to JGraphT which is designed for algorithms. One of its features is visualization using the JGraph library. It's..
http://stackoverflow.com/questions/5621338/how-to-add-jtable-in-jpanel Components Within a Container lesson for further details. One aspect of layouts that is not covered well by the tutorial is..
A class that behaves like @Entity and @Embeddable http://stackoverflow.com/questions/1029745/a-class-that-behaves-like-entity-and-embeddable Has someone an idea about i could save a Team and a Player ONE WAY RELATIONSHIP by using CascadeType.PERSIST with @Entity in..
Positioning of components (how to place a few buttons center screen same size) http://stackoverflow.com/questions/12835198/positioning-of-components-how-to-place-a-few-buttons-center-screen-same-size Box.createVerticalStrut 20 JButton btt1 new JButton BUTTON ONE create a new dimension object Dimension d new Dimension 200..
Is Java guaranteed to inline string constants if they can be determined at compile time http://stackoverflow.com/questions/1406616/is-java-guaranteed-to-inline-string-constants-if-they-can-be-determined-at-compi this case public Class1 public static final String ONE ABC public static final String TWO DEF public Class2 public.. Class2 public void someMethod System.out.println Class1.ONE Class1.TWO Typically you would expect the compiler to inline.. Typically you would expect the compiler to inline the ONE and TWO constants. However is this behavior guaranteed Can you..
ejb lookup failing with NamingException http://stackoverflow.com/questions/1473939/ejb-lookup-failing-with-namingexception A session bean 䏭 remote home interface MUST DEFINE ONE OR MORE create METHOD methods. A stateless session bean MUST..
Is it possible to extend Java Enums? http://stackoverflow.com/questions/2642281/is-it-possible-to-extend-java-enums Digit int getValue enum Decimal implements Digit ZERO ONE TWO THREE FOUR FIVE SIX SEVEN EIGHT NINE private final int value..
http://stackoverflow.com/questions/2780129/get-enum-by-its-inner-field package test Test enum to test enum public enum TestEnum ONE 1 TWO 2 THREE 3 private int number TestEnum int number this.number.. been made final . import java.util. public enum TestEnum ONE 1 TWO 2 SIXTY_NINE 69 private final int number TestEnum int..
Thread-safe cache of one object in java http://stackoverflow.com/questions/3636244/thread-safe-cache-of-one-object-in-java public class CountryList private static final Object ONE new Integer 1 MapMaker is from Google Collections Library private.. TO LOAD DATA public List String list return cache.get ONE public void invalidateCache cache.remove ONE What do you think.. cache.get ONE public void invalidateCache cache.remove ONE What do you think about it Do you see something bad about it..
Where do Java and .NET string literals reside? http://stackoverflow.com/questions/372547/where-do-java-and-net-string-literals-reside 002bf15c 025d2d04 System.String hello world THIS IS THE ONE 002bf224 025d2ccc System.Object System.String 002bf3d0 025d2ccc..
http://stackoverflow.com/questions/3978654/java-string-enum represent a set of strings Example enum Strings STRING_ONE ONE STRING_TWO TWO so I can use them as Strings Thanks java.. represent a set of strings Example enum Strings STRING_ONE ONE STRING_TWO TWO so I can use them as Strings Thanks java enums.. @author The Elite Gentleman public enum Strings STRING_ONE ONE STRING_TWO TWO @param text private Strings final String..
JFormattedTextField is not properly cleared http://stackoverflow.com/questions/4148336/jformattedtextfield-is-not-properly-cleared FocusEvent e setBackground background enum Digit EMPTY 0 ONE 1 1 TWO 2 2 THREE 3 3 FOUR 4 4 FIVE 5 5 SIX 6 6 SEVEN 7 7 EIGHT.. 9 9 public static EnumSet Digit digits EnumSet.range Digit.ONE Digit.NINE private int i private String s Digit int i String..
Best way to represent a fraction in Java? http://stackoverflow.com/questions/474535/best-way-to-represent-a-fraction-in-java ZERO new BigFraction BigInteger.ZERO BigInteger.ONE true public final static BigFraction ONE new BigFraction BigInteger.ONE.. BigInteger.ONE true public final static BigFraction ONE new BigFraction BigInteger.ONE BigInteger.ONE true Constructs.. final static BigFraction ONE new BigFraction BigInteger.ONE BigInteger.ONE true Constructs a BigFraction with given numerator..
http://stackoverflow.com/questions/4948152/need-sample-android-rest-client-project-which-implements-virgil-dobjanschi-rest back to the caller Activity. I also wonder if I need ONE Service which handles all REST requests with different return..
Can someone please explain mappedBy in hibernate? http://stackoverflow.com/questions/9108224/can-someone-please-explain-mappedby-in-hibernate OWNS many AirlineFlights Many AirlineFlights belong to ONE Airline Airline @Entity @Table name Airline public class Airline..
How to change text color in the JtextArea? http://stackoverflow.com/questions/9650992/how-to-change-text-color-in-the-jtextarea Too Good. n Color.RED appendToPane tPane I wish I could be ONE of THE BEST on Color.BLUE appendToPane tPane Stack Color.DARK_GRAY..
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