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java Programming Glossary: objectWhy JSF calls getters multiple times http://stackoverflow.com/questions/2090033/why-jsf-calls-getters-multiple-times not immediately evaluated but created as a ValueExpression object and the getter method behind the expression is executed everytime..
What is a Null Pointer Exception? http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception question When you declare a reference variable i.e. an object you are really creating a pointer to an object. Consider the.. i.e. an object you are really creating a pointer to an object. Consider the following code where you declare a variable of.. line the new keyword is used to instantiate or create an object of type Integer and the pointer variable num is assigned this..
Overriding equals and hashCode in Java http://stackoverflow.com/questions/27581/overriding-equals-and-hashcode-in-java and transitive . In addition it must be consistent if the objects are not modified then it must keep returning the same value.. false. hashCode javadoc must also be consistent if the object is not modified in terms of equals it must keep returning the.. or WeakHashMap make sure that the hashCode of the key objects that you put into the collection never changes while the object..
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 explicitly told the compiler that it is capable of holding objects of any type. While you can pass a List String to a parameter.. List E defines only add E you can't add just any arbitrary object to a List . On the other hand since the raw type List does not..
What is a serialVersionUID and why should I use it? http://stackoverflow.com/questions/285793/what-is-a-serialversionuid-and-why-should-i-use-it to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with.. of a serialized object have loaded classes for that object that are compatible with respect to serialization. If the receiver.. serialization. If the receiver has loaded a class for the object that has a different serialVersionUID than that of the corresponding..
How do servlets work? Instantiation, session variables and multithreading http://stackoverflow.com/questions/3106452/how-do-servlets-work-instantiation-session-variables-and-multithreading will create new HttpServletRequest and HttpServletResponse objects and pass it through the methods of the already created Filter.. the request URL all in the same thread. The request object provides access to all information of the HTTP request such.. as the request headers and the request body. The response object provides facility to control and send the HTTP response the..
A better Java JSON library? [closed] http://stackoverflow.com/questions/338586/a-better-java-json-library be used to convert a JSON string to an equivalent Java object. Gson can work with arbitrary Java objects including pre existing.. equivalent Java object. Gson can work with arbitrary Java objects including pre existing objects that you do not have source.. work with arbitrary Java objects including pre existing objects that you do not have source code of. There are a few open source..
Design Patterns web based applications http://stackoverflow.com/questions/3541077/design-patterns-web-based-applications it to corresponding service layer.Also should the request object forwarded to service layer or not. Please you guide us in choosing.. directly with HttpServletRequest and HttpServletResponse objects. You have to gather convert and validate the request parameters.. Context class which in turn wraps the request and response objects and offers several convenience methods delegating to the request..
http://stackoverflow.com/questions/40480/is-java-pass-by-reference The difficult thing can be to understand that Java passes objects as references and those references are passed by value. It.. return Max . d is not overwritten in the function as the object reference is passed by value. Likewise public void foo Dog d..
http://stackoverflow.com/questions/4112686/how-to-use-servlets-and-ajax First you'd like to have a tool to convert between Java objects and JSON strings. There are plenty of them as well see the.. responseJson function key value Iterate over the JSON object. ' option ' .val key .text value .appendTo select Create HTML..
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 Java what is the best way to determine the size of an object For example let's say I have an application that can read in.. cause OutOfMemory Exceptions. Each row translates into an object. Is there an easy way to find out the size of that object programmatically.. object. Is there an easy way to find out the size of that object programmatically Is there a reference that defines how large..
http://stackoverflow.com/questions/5853879/swing-obtain-image-of-jframe call the Component's paint method using the Graphics object of the image. component.paint image.getGraphics return image..
Overriding equals and hashCode in Java http://stackoverflow.com/questions/27581/overriding-equals-and-hashcode-in-java name . append age . toHashCode public boolean equals Object obj if obj null return false if obj this return true if obj..
What is a serialVersionUID and why should I use it? http://stackoverflow.com/questions/285793/what-is-a-serialversionuid-and-why-should-i-use-it various aspects of the class as described in the Java TM Object Serialization Specification. However it is strongly recommended..
GUI not working after rewriting to MVC http://stackoverflow.com/questions/3066590/gui-not-working-after-rewriting-to-mvc Observer @Override public void update Observable o Object arg if arg null label.setText s icon.color Color.gray else..
How do servlets work? Instantiation, session variables and multithreading http://stackoverflow.com/questions/3106452/how-do-servlets-work-instantiation-session-variables-and-multithreading that public class MyServlet extends HttpServlet private Object thisIsNOTThreadSafe protected void doGet HttpServletRequest.. response throws ServletException IOException Object thisIsThreadSafe thisIsNOTThreadSafe request.getParameter foo..
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 import java.lang.instrument.Instrumentation public class ObjectSizeFetcher private static Instrumentation instrumentation public.. inst instrumentation inst public static long getObjectSize Object o return instrumentation.getObjectSize o Add the.. inst instrumentation inst public static long getObjectSize Object o return instrumentation.getObjectSize o Add the following..
How to: generic array creation http://stackoverflow.com/questions/529085/how-to-generic-array-creation that case you should write public class GenSet E private Object a public GenSet int s a new Object s E get int i @SuppressWarnings.. class GenSet E private Object a public GenSet int s a new Object s E get int i @SuppressWarnings unchecked final E e E a i return..
read/write to Windows Registry using Java http://stackoverflow.com/questions/62289/read-write-to-windows-registry-using-java systemRoot hkey key regCloseKey.invoke systemRoot new Object new Integer ret 0 else if hkey HKEY_CURRENT_USER ret createKey.. userRoot hkey key regCloseKey.invoke userRoot new Object new Integer ret 0 else throw new IllegalArgumentException hkey.. int handles int regOpenKey.invoke root new Object new Integer hkey toCstr key new Integer KEY_ALL_ACCESS if handles..
how to push data from BlazeDS without recieve message from Flex client? http://stackoverflow.com/questions/1872742/how-to-push-data-from-blazeds-without-recieve-message-from-flex-client adapter. Great for testing when you want to JUST SEND AN OBJECT and nothing else. This class has to stay in the main codebase..
JAXB marshalling problem - probably namespace related http://stackoverflow.com/questions/3394644/jaxb-marshalling-problem-probably-namespace-related unMarsh null Object obj new Object try XML TO JAVA OBJECT jaxbContext JAXBContext.newInstance org.example unMarsh jaxbContext.createUnmarshaller..
How to call oracle stored procedure which include user-defined type in java? http://stackoverflow.com/questions/3626061/how-to-call-oracle-stored-procedure-which-include-user-defined-type-in-java a setup similar to yours SQL CREATE OR REPLACE TYPE IDS AS OBJECT id1 NUMBER id2 NUMBER id3 NUMBER 2 Type created SQL CREATE OR..
Is there any reason that Java uses late/static binding for overloaded methods in the same class? http://stackoverflow.com/questions/3883414/is-there-any-reason-that-java-uses-late-static-binding-for-overloaded-methods-in public void doSomething Object o System.out.println OBJECT public static void main String args Object i new Integer 2 Object.. sc new SomeClass sc.doSomething i sc.doSomething o Prints OBJECT OBJECT I would rather expect INTEGER OBJECT java polymorphism.. SomeClass sc.doSomething i sc.doSomething o Prints OBJECT OBJECT I would rather expect INTEGER OBJECT java polymorphism share..
Does subclasses inherit private fields? http://stackoverflow.com/questions/4716040/does-subclasses-inherit-private-fields of Inheritance. Obviously as @DigitalRoss explains an OBJECT of a subclass must contain its superclass's private fields... . emphasis added by me The answer is No. They do not. OBJECTS of subclasses contain private fields of their superclasses...
A Java collection of value pairs? (tuples?) http://stackoverflow.com/questions/521171/a-java-collection-of-value-pairs-tuples types I need to use I'd have to make them arrays of OBJECT and then I'd have to cast all the time. I only need to store..
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