java Programming Glossary: dosomething

http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception

For instance you may have a method as follows public void doSomething Integer num do something to num in which case you are not creating.. object num rather assuming that is was created before the doSomething method was called. Unfortunately it is possible to call the.. Unfortunately it is possible to call the method like this doSomething null In which case num is null. The best way to avoid this type..

Is there a performance difference between a for loop and a for-each loop?

http://stackoverflow.com/questions/256859/is-there-a-performance-difference-between-a-for-loop-and-a-for-each-loop

over collections and arrays for Element e elements doSomething e When you see the colon read it as 𦤹n. Thus the loop above..

Avoiding “!= null” statements in Java?

http://stackoverflow.com/questions/271526/avoiding-null-statements-in-java

if you have these interfaces public interface Action void doSomething public interface Parser Action findAction String userInput where.. private static Action DO_NOTHING new Action public void doSomething do nothing public Action findAction String userInput ... if.. someInput if action null do nothing else action.doSomething to ParserFactory.getParser .findAction someInput .doSomething..

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

Animal Parent Dog Cat Children So suppose I have a method doSomething List Animal animals . By all the rules of inheritance and polymorphism.. method to accept a list of any subset of Animal by saying doSomething List extends Animal animals . I understand that this is Java's..

What is reflection, and why is it useful?

http://stackoverflow.com/questions/37628/what-is-reflection-and-why-is-it-useful

of an unknown type in Java and you would like to call a 'doSomething' method on it if one exists. Java's static typing system isn't.. look at the object and find out if it has a method called 'doSomething' and then call it if you want to. So to give you a code example.. in question is foo Method method foo.getClass .getMethod doSomething null method.invoke foo null One very common use case in Java..

Best practices for exception management in Java or C#

http://stackoverflow.com/questions/409563/best-practices-for-exception-management-in-java-or-c-sharp

sample code in JAVA of a typical method public boolean doSomething Object p_somthingToDoOn boolean result false try if dirty object..

What is the Java ?: operator called and what does it do?

http://stackoverflow.com/questions/798545/what-is-the-java-operator-called-and-what-does-it-do

appear 禮14.8 . So you cannot compress this if someBool doSomething else doSomethingElse into this someBool doSomething doSomethingElse.. . So you cannot compress this if someBool doSomething else doSomethingElse into this someBool doSomething doSomethingElse share improve..

Equivalent of C# Anonymous Delegates in Java?

http://stackoverflow.com/questions/1340231/equivalent-of-c-sharp-anonymous-delegates-in-java

sugar . So or example I can do this public string DoSomething Func string string someDelegate Do something involving someDelegate.. someDelegate Do something involving someDelegate string s DoSomething delegate string s return s asd DoSomething delegate string s.. string s DoSomething delegate string s return s asd DoSomething delegate string s return s.Reverse Is it possible to pass code..

How to call a method after a delay

http://stackoverflow.com/questions/3072173/how-to-call-a-method-after-a-delay

c there was something like self performSelector @selector DoSomething withObject nil afterDelay 5 Is there an equivalent of this method.. to be able to call a method after 5 seconds. public void DoSomething do something here java android handler delay share improve..

Do some Android UI stuff in non-UI thread

http://stackoverflow.com/questions/6223389/do-some-android-ui-stuff-in-non-ui-thread

extends Observable implements Runnable public void run try DoSomething String response Doing something setChanged notifyObservers.. Doing something setChanged notifyObservers response DoSomethingElse String response Doing something else setChanged notifyObservers.. catch IOException e e.printStackTrace private void DoSomething private void DoSomethingElse public class MainActivity public..