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java Programming Glossary: instanceWhy is Java Vector class considered obsolete or deprecated? http://stackoverflow.com/questions/1386275/why-is-java-vector-class-considered-obsolete-or-deprecated is both less safe if you iterate over a Vector for instance you still need to take out a lock to avoid anyone else changing..
What is the difference between JSF, Servlet and JSP? http://stackoverflow.com/questions/2095397/what-is-the-difference-between-jsf-servlet-and-jsp the webapp starts up the servlet container will create an instance of it and keep it in memory during webapp's lifetime. The same.. and keep it in memory during webapp's lifetime. The same instance will be reused for every incoming request whose URL matches..
What is a Null Pointer Exception? http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception write code that does not directly create the object. For instance you may have a method as follows public void doSomething Integer..
Trusting all certificates using HttpClient over HTTPS http://stackoverflow.com/questions/2642777/trusting-all-certificates-using-httpclient-over-https .createSocket and use this class while creating instance of HttpClient. public HttpClient getNewHttpClient try KeyStore..
How do servlets work? Instantiation, session variables and multithreading http://stackoverflow.com/questions/3106452/how-do-servlets-work-instantiation-session-variables-and-multithreading and the ServletContext and all Servlet Filter and Listener instances will be trashed. HttpServletRequest and HttpServletResponse.. the methods of the already created Filter and Servlet instances whose url pattern matches the request URL all in the same thread... has a default lifetime which is as long as the browser instance is running. So when the client closes the browser instance all..
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 buffer and a copy of the character data in the new String instance all reside in memory at once. It is safest to apply to files..
Why not use Double or Float to represent currency? http://stackoverflow.com/questions/3730019/why-not-use-double-or-float-to-represent-currency be seen in fact as exact fractions of a power of ten. For instance 10.45 really is 1045 10^2 . And just as some fractions can't..
Migrating from JSF 1.2 to JSF 2.0 http://stackoverflow.com/questions/4441713/migrating-from-jsf-1-2-to-jsf-2-0 xml ns javaee xmlns xsi http www.w3.org 2001 XMLSchema instance xsi schemaLocation http java.sun.com xml ns javaee http java.sun.com.. web app_2_5.xsd xmlns xsi http www.w3.org 2001 XMLSchema instance xsi schemaLocation http java.sun.com xml ns javaee http java.sun.com.. xml ns javaee xmlns xsi http www.w3.org 2001 XMLSchema instance xsi schemaLocation http java.sun.com xml ns javaee http java.sun.com..
Calling awt Frame methods from subclass http://stackoverflow.com/questions/5665156/calling-awt-frame-methods-from-subclass this is because I was told that you should only have on instance of a Papplet at a time. PApplet is the Applet class in Processing.. PARENT FRAME while p null printParentTree p if p instanceof ExampleFrame ExampleFrame myframe ExampleFrame p myframe.sampleMethod.. SECOND WAY OF ACCESSING PARENT FRAME if frame null frame instanceof ExampleFrame ExampleFrame myframe ExampleFrame p myframe.sampleMethod..
Java inner class and static nested class http://stackoverflow.com/questions/70324/java-inner-class-and-static-nested-class new OuterClass.StaticNestedClass Objects that are instances of an inner class exist within an instance of the outer class... that are instances of an inner class exist within an instance of the outer class. Consider the following classes class OuterClass.. classes class OuterClass ... class InnerClass ... An instance of InnerClass can exist only within an instance of OuterClass..
Singleton with Arguments in Java http://stackoverflow.com/questions/1050991/singleton-with-arguments-in-java or the first access to SingletonHolder.INSTANCE not before. private static class SingletonHolder private static.. class SingletonHolder private static final Singleton INSTANCE new Singleton public static Singleton getInstance return SingletonHolder.INSTANCE.. public static Singleton getInstance return SingletonHolder.INSTANCE While I really like the way this Singleton behaves I can't..
Is there a recommended way to use the Observer pattern in MVP using GWT? http://stackoverflow.com/questions/2832779/is-there-a-recommended-way-to-use-the-observer-pattern-in-mvp-using-gwt implements EventHandler private final static EventBus INSTANCE new EventBus private HashMap Module ArrayList Subscriber subscribers.. ArrayList Subscriber public static EventBus get return INSTANCE public void fire ScEvent event if subscribers.containsKey event.getKey..
create java console inside the panel http://stackoverflow.com/questions/342990/create-java-console-inside-the-panel class TextAreaOutputStream extends OutputStream INSTANCE PROPERTIES private JTextArea textArea target text area.. line private byte oneByte array for write int val INSTANCE CONSTRUCTORS INIT CLOSE FINALIZE public TextAreaOutputStream.. new LinkedList curLength 0 oneByte new byte 1 INSTANCE METHODS ACCESSORS public synchronized void clear lineLengths..
What is the best approach for using an Enum as a singleton in Java? http://stackoverflow.com/questions/427902/what-is-the-best-approach-for-using-an-enum-as-a-singleton-in-java pros cons between constructor omitted public enum Elvis INSTANCE private int age public int getAge return age and then calling.. age public int getAge return age and then calling Elvis.INSTANCE.getAge and public enum Elvis INSTANCE private int age public.. then calling Elvis.INSTANCE.getAge and public enum Elvis INSTANCE private int age public static int getAge return INSTANCE.age..
Can I change my Windows desktop wallpaper programmatically in Java/Groovy? http://stackoverflow.com/questions/4750372/can-i-change-my-windows-desktop-wallpaper-programmatically-in-java-groovy Public Pictures Sample Pictures Chrysanthemum.jpg SPI.INSTANCE.SystemParametersInfo new UINT_PTR SPI.SPI_SETDESKWALLPAPER new.. 0x01 long SPIF_SENDWININICHANGE 0x02 SPI INSTANCE SPI Native.loadLibrary user32 SPI.class new HashMap Object Object..
Determine if a String is an Integer in Java [duplicate] http://stackoverflow.com/questions/5439529/determine-if-a-string-is-an-integer-in-java
Polymorphism with gson [closed] http://stackoverflow.com/questions/5800433/polymorphism-with-gson String CLASSNAME CLASSNAME private static final String INSTANCE INSTANCE @Override public JsonElement serialize IAnimal src.. CLASSNAME CLASSNAME private static final String INSTANCE INSTANCE @Override public JsonElement serialize IAnimal src Type typeOfSrc.. JsonElement elem context.serialize src retValue.add INSTANCE elem return retValue @Override public IAnimal deserialize JsonElement..
How can I set the System Time in Java? http://stackoverflow.com/questions/6203857/how-can-i-set-the-system-time-in-java you can replace public class SysTime public static SysTime INSTANCE new SysTime public long now return System.currentTimeMillis.. System.currentTimeMillis For tests you can overwrite INSTANCE with something that returns other times. Add more methods to..
What is an efficient way to implement a singleton pattern in Java? http://stackoverflow.com/questions/70689/what-is-an-efficient-way-to-implement-a-singleton-pattern-in-java share improve this question Use an enum public enum Foo INSTANCE Joshua Bloch explained this approach in his Effective Java Reloaded.. to Implement a Serializable Singleton public enum Elvis INSTANCE private final String favoriteSongs Hound Dog Heartbreak Hotel..
Overriding vs Hiding Java - Confused http://stackoverflow.com/questions/10594052/overriding-vs-hiding-java-confused System.out.println Class method in Animal. public void testInstanceMethod System.out.println Instance method in Animal. Then we.. Animal. public void testInstanceMethod System.out.println Instance method in Animal. Then we have a subclass cat public class.. The class method in Cat. public void testInstanceMethod System.out.println The instance method in Cat. public..
Difference between Static methods and Instance methods http://stackoverflow.com/questions/11993077/difference-between-static-methods-and-instance-methods between Static methods and Instance methods I was just reading over the text given to me in my.. Methods are Also could I get a simple explanation on what Instance methods are This is what they give me in the textbook There..
How is an instance initializer different from a constructor? http://stackoverflow.com/questions/1355810/how-is-an-instance-initializer-different-from-a-constructor improve this question This seems to explain it well Instance initializers are a useful alternative to instance variable initializers.. no matter what constructor is used to create the object. Instance initializers are also useful in anonymous inner classes which..
Instance variable initialization in java http://stackoverflow.com/questions/1994218/instance-variable-initialization-in-java variable initialization in java I have doubt in instance variable..
In what order do static initializer blocks in Java run? http://stackoverflow.com/questions/2007666/in-what-order-do-static-initializer-blocks-in-java-run System.out.println END class Parent extends Grandparent Instance init block System.out.println instance parent Constructor.. init block static System.out.println static grandparent Instance init block System.out.println instance grandparent Constructor.. Static init block static System.out.println static child Instance init block System.out.println instance child and got this..
http://stackoverflow.com/questions/335311/static-initializer-in-java actually when it's resolved but that's a technicality . Instance initializers are executed in the order defined when the class..
Should I initialize variable within constructor or outside constructor [duplicate] http://stackoverflow.com/questions/3918578/should-i-initialize-variable-within-constructor-or-outside-constructor duplicate This question already has an answer here Instance variable initialization in java 8 answers When I use..
Cannot Make Static Reference to Non-Static Method http://stackoverflow.com/questions/4969171/cannot-make-static-reference-to-non-static-method why you have to understand the difference in the two. Instance non static methods work on objects that are of a particular..
How to create a modular JSF 2.0 application? http://stackoverflow.com/questions/6199458/how-to-create-a-modular-jsf-2-0-application CDI for resolution of the modules Specifically it uses Instance injection points on API interfaces to resolve modules and passes..
Why java Instance initializers? http://stackoverflow.com/questions/6763550/why-java-instance-initializers java Instance initializers I'm studying Java now I passed by Instance initializers.. Instance initializers I'm studying Java now I passed by Instance initializers I'm wondering what is the sense of it if we can.. the constructor instead isn't that do the purpose then why Instance initializers java share improve this question I use them..
Java: how to call non static method from main method? http://stackoverflow.com/questions/7379915/java-how-to-call-non-static-method-from-main-method context . It's really important that you understand that Instance methods and fields etc relate to a particular instance Static..
Use of Initializers vs Constructors in Java http://stackoverflow.com/questions/804589/use-of-initializers-vs-constructors-in-java that I didn't know about previously. Static and Instance Initializers are two such techniques. My question is when would..
Efficiency of Java “Double Brace Initialization”? http://stackoverflow.com/questions/924285/efficiency-of-java-double-brace-initialization is just a rewrite of List String list new ArrayList String Instance initialization block add Hello add World So it's basically..
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