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java Programming Glossary: saysWhy doesn't System.out.println work? (in Android) http://stackoverflow.com/questions/2220547/why-doesnt-system-out-println-work-in-android Warning i Information d Debug v Verbose The documentation says the following about the levels Verbose should never be compiled..
Why is it a bad practice to call System.gc? http://stackoverflow.com/questions/2414105/why-is-it-a-bad-practice-to-call-system-gc share improve this question The reason everyone always says to avoid System.gc is that it is a pretty good indicator of..
non-static variable cannot be referenced from a static context http://stackoverflow.com/questions/2559527/non-static-variable-cannot-be-referenced-from-a-static-context someone driving it it has an engine wheels. So the class says all cars have a color and the instance says this specific car.. So the class says all cars have a color and the instance says this specific car is red . In the OO world you define the class..
http://stackoverflow.com/questions/2707322/what-is-null-in-java of any reference type. What is null As the JLS quote above says in practice you can simply pretend that it's merely a special.. how using null can complicate things. The first statement says that if the key isn't mapped null is returned. The second statement.. key isn't mapped null is returned. The second statement says that even if the key is mapped null can also be returned. In..
http://stackoverflow.com/questions/299068/how-slow-are-java-exceptions Conventional wisdom as well as a lot of Google results says that exceptional logic shouldn't be used for normal program.. not fast. The article Effective Exception Handling in Java says that the reason for this is due to the object creation aspect.. or any other JVM version possibly of any other vendor who says they also use the fast implementation The fast one is more complicated..
Java Strings: “String s = new String(”silly“);” http://stackoverflow.com/questions/334518/java-strings-string-s-new-stringsilly I'm reading Effective Java and something confused me. It says never to write code like this String s new String silly Because..
Design Patterns web based applications http://stackoverflow.com/questions/3541077/design-patterns-web-based-applications you. Here's an example of a LoginAction which as its name says logs in the user. The User itself is in turn a Data Model ...
How do I import the javax.servlet API in my Eclipse project? http://stackoverflow.com/questions/4076601/how-do-i-import-the-javax-servlet-api-in-my-eclipse-project project I want to develop with Servlets in Eclipse but it says that the package javax.servlet cannot be resolved. How can I..
Bringing JFileChooser on top of all windows http://stackoverflow.com/questions/5129294/bringing-jfilechooser-on-top-of-all-windows The API for showOpenDialog refers to showDialog which says If the parent is null then the dialog depends on no visible..
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 object references are for a VM Right now I have code that says read up to 32 000 rows but I'd also like to have code that says.. read up to 32 000 rows but I'd also like to have code that says read as many rows as possible until I've used 32MB of memory...
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 favoriteSongs Edit An online portion of Effective Java says This approach is functionally equivalent to the public field..
HTTP URL Address Encoding in Java http://stackoverflow.com/questions/724043/http-url-address-encoding-in-java is not designed to encode HTTP URLs... The JavaDoc says Utility class for HTML form encoding ... Is there any other..
http://stackoverflow.com/questions/7911776/what-is-x-after-x-x is still 7 even after the entire statement . In my book it says that x is incremented java operators post increment share..
What are the reasons why Map.get(Object key) is not (fully) generic http://stackoverflow.com/questions/857420/what-are-the-reasons-why-map-getobject-key-is-not-fully-generic the case. For example the specification for List.equals says that two List objects are equal if they are both Lists and have..
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