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java Programming Glossary: alwaysJComponents not showing up with picture background? http://stackoverflow.com/questions/11369171/jcomponents-not-showing-up-with-picture-background 5 try Since Images are Application Resources it's always best to access them in the form of a URL instead of File as..
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 up method. I.e. if the decimal to be rounded is a 5 it always rounds up the previous number. This is the standard method of.. .5g n 0.912385 returns 0.91239 which is great however it always displays numbers with 5 decimal places even if they are not..
What is a Null Pointer Exception? http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception null. The best way to avoid this type of exception is to always check for null when you did not create the object yourself...
Efficient equivalent for removing elements while iterating the Collection http://stackoverflow.com/questions/223918/efficient-equivalent-for-removing-elements-while-iterating-the-collection etc... this apparently works sometimes but not always. Here's some specific code public static void main String args.. means most time and space efficient I realize you can't always have both I'm also using an arbitrary Collection here not necessarily..
How to discover memory usage of my application in Android http://stackoverflow.com/questions/2298208/how-to-discover-memory-usage-of-my-application-in-android look at memory usage numbers with other engineers there is always a long discussion about what they actually mean that only results..
http://stackoverflow.com/questions/2723397/java-generics-what-is-pecs unlike Collection extends Thing Collection super Thing can always hold a Thing no matter what the actual parameterized type is...
Overriding equals and hashCode in Java http://stackoverflow.com/questions/27581/overriding-equals-and-hashcode-in-java returning the same value . Furthermore o.equals null must always return false. hashCode javadoc must also be consistent if the..
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 raw types should NEVER be used in new code. You should always use parameterized types . Are there no exceptions Unfortunately..
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 URL url .openConnection ... Note that this is known to not always work properly in all circumstances. If it fails for you then..
What is the reason behind “non-static method cannot be referenced from a static context”? http://stackoverflow.com/questions/290884/what-is-the-reason-behind-non-static-method-cannot-be-referenced-from-a-static
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 return null The method above doInBackground runs always on a background thread. You shouldn't do any UI tasks there...
When to use LinkedList<> over ArrayList<>? http://stackoverflow.com/questions/322715/when-to-use-linkedlist-over-arraylist to use LinkedList over ArrayList I've always been one to simply use List String names new ArrayList String..
Switch Statement with Strings in Java http://stackoverflow.com/questions/338206/switch-statement-with-strings-in-java The resulting code uses JVM instructions that have always existed. A switch with String cases is translated into two switches..
Why not use Double or Float to represent currency? http://stackoverflow.com/questions/3730019/why-not-use-double-or-float-to-represent-currency not use Double or Float to represent currency So I've always been told NEVER to do this and this time I pose the question..
http://stackoverflow.com/questions/40480/is-java-pass-by-reference Java &ldquo pass by reference&rdquo I always thought Java was pass by reference however I've seen a couple.. pass by value share improve this question Java is always pass by value. The difficult thing can be to understand that..
Draw a line in a JPanel with button click in Java http://stackoverflow.com/questions/5797862/draw-a-line-in-a-jpanel-with-button-click-in-java but the problem is the how to use it. In many exmples always they draw in a JFrame that extends from a JPanel. I want to..
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 I have been told this With layouts the answer is always the same use a suitable LayoutManager I have searched the web..
How to maintain JTable cell rendering after cell edit http://stackoverflow.com/questions/10067060/how-to-maintain-jtable-cell-rendering-after-cell-edit Double.valueOf i JTable table new JTable model @Override Always selectAll public boolean editCellAt int row int column EventObject..
What is SuppressWarnings (“unchecked”) in Java? http://stackoverflow.com/questions/1129795/what-is-suppresswarnings-unchecked-in-java of shape so much that suppressing the warning is neater. Always add an explanatory comment in that case The same generics FAQ..
Drawing a rectangle that won't disappear in next paint http://stackoverflow.com/questions/12683533/drawing-a-rectangle-that-wont-disappear-in-next-paint WITHOUT VERY VERY good reason...use paintComponent instead Always call super.paintXxx these methods do a lot in the background..
Appearance of Java Security dialog http://stackoverflow.com/questions/12986333/appearance-of-java-security-dialog cannot be verified' as in that message in the dialog then Always trust will default to false. It will be ignored even if selected...
Jboss Seam: Enabling Debug page on WebLogic 10.3.2 (11g) http://stackoverflow.com/questions/2453746/jboss-seam-enabling-debug-page-on-weblogic-10-3-2-11g . My advice is And if you want to avoid a lot of headache Always generate your project by using Seam gem See here why A nice..
Round a double to 2 decimal places http://stackoverflow.com/questions/2808535/round-a-double-to-2-decimal-places return bd.doubleValue And in every case Always remember that floating point representations using float and..
“Always on Top” Windows with Java http://stackoverflow.com/questions/297938/always-on-top-windows-with-java Always on Top&rdquo Windows with Java In Java is there a way to have.. with Java In Java is there a way to have a window that is Always on top regardless if the user switches focus to another application.. question Try this method of the Window class Window.setAlwaysOnTop boolean It works the same way as the default in the Windows..
Why does Java's hashCode() in String use 31 as a multiplier? http://stackoverflow.com/questions/299304/why-does-javas-hashcode-in-string-use-31-as-a-multiplier sort of optimization automatically. from Chapter 3 Item 9 Always override hashcode when you override equals page 48 share improve..
Validating input using java.util.Scanner http://stackoverflow.com/questions/3059333/validating-input-using-java-util-scanner throw an InputMismatchException NoSuchElementException . Always remember that hasNextXXX does not advance the Scanner past any..
JPA: How to have one-to-many relation of the same Entity type http://stackoverflow.com/questions/3393515/jpa-how-to-have-one-to-many-relation-of-the-same-entity-type of a bidirectional relationship is an error under JPA. Always update both sides of the relationship. This is written unambiguously..
How to rotate an image gradually in Swing? http://stackoverflow.com/questions/3405799/how-to-rotate-an-image-gradually-in-swing to @tulskiy's helpful observations I would add two points Always construct your GUI on the event dispatch thread as shown below...
Why are local variables not initialized in Java? http://stackoverflow.com/questions/415687/why-are-local-variables-not-initialized-in-java and so it will be an error to attempt to call so.CleanUp . Always enter the try section after you have acquired the resource that..
Sandbox against malicious code in a Java application http://stackoverflow.com/questions/502218/sandbox-against-malicious-code-in-a-java-application secret secret null ... override checkXXX method s here. Always allow them to succeed when secret null Thread class MyIsolatedThread..
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 limited range of JVM performance characteristics. Rule 1 Always include a warmup phase which runs your test kernel all the way.. several tens of thousands of inner loop iterations. Rule 2 Always run with XX PrintCompilation verbose gc etc. so you can verify..
Synchronizing on an Integer value [duplicate] http://stackoverflow.com/questions/659915/synchronizing-on-an-integer-value
http://stackoverflow.com/questions/7520432/java-vs-equals-confusion the same object if their references are one and the same. Always remember to override hashCode if you override equals so as not..
Best practice for setting JFrame locations http://stackoverflow.com/questions/7777640/best-practice-for-setting-jframe-locations Where should the first and main frame be located Always at the center setLocationRelativeTo null Where should a child..
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