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java Programming Glossary: oftenHow to sort a Map<Key, Value> on the values in Java? http://stackoverflow.com/questions/109383/how-to-sort-a-mapkey-value-on-the-values-in-java on the values in Java I am relatively new to Java and often find that I need to sort a Map on the values. Since the values..
Why is processing a sorted array faster than an unsorted array? http://stackoverflow.com/questions/11227809/why-is-processing-a-sorted-array-faster-than-an-unsorted-array the train will never have to stop. If you guess wrong too often the train will spend a lot of time stopping backing up and restarting... execution will never have to stop. If you guess wrong too often you spend a lot of time stalling rolling back and restarting...
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 point take any memory info you get with a grain of salt often a very large grain. Finally there is the command adb shell cat.. few people and my questions of those few people about them often resulting in conflicting explanations MemTotal 395144 kB MemFree.. amount of memory available to the kernel and user space often less than the actual physical RAM of the device since some 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 where you have a limited set which doesn't change often . To solve your problem you need to instantiate an instance..
Avoiding “!= null” statements in Java? http://stackoverflow.com/questions/271526/avoiding-null-statements-in-java it. If it's code that you do control however and this is often the case then it's a different story. Avoid using nulls as a..
How do I “decompile” Java class files? http://stackoverflow.com/questions/272535/how-do-i-decompile-java-class-files assembly code On Java performance questions on this site I often see responses from people who have decompiled the Java class..
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 use it Questions What are raw types in Java and why do I often hear that they shouldn't be used in new code What is the alternative..
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 to fire and handle HTTP requests URLConnection is pretty often asked here and the Oracle tutorial is too concise about it...
What are the pros and cons of the leading Java HTML parsers? http://stackoverflow.com/questions/3152138/what-are-the-pros-and-cons-of-the-leading-java-html-parsers specific cleaners and the robustness of the library how often is it updated maintained fixed . If you like to unit test the.. to extract specific data from the HTML which is more than often the real world requirement then Jsoup is the way to go. share..
How to avoid Java Code in JSP-Files? http://stackoverflow.com/questions/3177733/how-to-avoid-java-code-in-jsp-files depends on the sole purpose of the code logic. More than often this code is to be placed in a fullworthy Java class. If you..
Design Patterns web based applications http://stackoverflow.com/questions/3541077/design-patterns-web-based-applications Model is to be represented by Javabean classes. This is often further dividable in Business Model which contains the actions..
What is a stack trace, and how can I use it to debug my application errors? http://stackoverflow.com/questions/3988788/what-is-a-stack-trace-and-how-can-i-use-it-to-debug-my-application-errors that's happening in my program About this question quite often I see a question come through where a novice programmer is getting..
http://stackoverflow.com/questions/4112686/how-to-use-servlets-and-ajax JavaScript and XML . However last years it's more than often Asynchronous JavaScript and JSON . Basically you let JS execute..
Unicode equivalents for \w and \b in Java regular expressions? http://stackoverflow.com/questions/4304928/unicode-equivalents-for-w-and-b-in-java-regular-expressions BMP portion of Unicode the astral planes However people often want a different sort of boundary. They want something that..
Java: checked vs unchecked exception explanation http://stackoverflow.com/questions/6115896/java-checked-vs-unchecked-exception-explanation you from catching the unchecked exception as well Most often because people are lazy to consider what to catch and what to..
Why is subtracting these two times (in 1927) giving a strange result? http://stackoverflow.com/questions/6841333/why-is-subtracting-these-two-times-in-1927-giving-a-strange-result time hence the difference. Just another episode in the often weird and wonderful world of time zones. EDIT Stop press History..
Experience migrating legacy Cobol/PL1 to Java http://stackoverflow.com/questions/1029974/experience-migrating-legacy-cobol-pl1-to-java decades of stored knowledge represented by the code base. Often there are many subtleties that your new code may miss. On the..
Which loop has better performance? Why? http://stackoverflow.com/questions/110083/which-loop-has-better-performance-why bad practice and has another side effect discussed below. Often a bogus value like null is assigned to a variable simply to..
Is shifting bits faster than multiplying and dividing in Java? .NET? http://stackoverflow.com/questions/1168451/is-shifting-bits-faster-than-multiplying-and-dividing-in-java-net a compile time constant even if it's not a power of 2. Often a multiply or divide can be decomposed to a series of shifts..
What does the <TYPE> in java mean? http://stackoverflow.com/questions/12649572/what-does-the-type-in-java-mean inherit from Number include Integer Long Double Float ... Often in method and class decelerations you will see something similar..
Difficulties understanding the renderers mechanism of swing's JTable and JTree http://stackoverflow.com/questions/13672980/difficulties-understanding-the-renderers-mechanism-of-swings-jtable-and-jtree the renderers mechanism of swing's JTable and JTree Often when using JTable or JTree user writes and assign it is own..
How to reference a generic return type with multiple bounds http://stackoverflow.com/questions/14464226/how-to-reference-a-generic-return-type-with-multiple-bounds the call site already knows what T is being resolved to. Often these type parameters will be inferred by the compiler which..
http://stackoverflow.com/questions/1611862/how-to-stop-threads-in-java have each of the other threads periodically check a flag. Often background threads loop waiting for work they just have to check..
Is there a performance difference between Javac debug on and off? http://stackoverflow.com/questions/218033/is-there-a-performance-difference-between-javac-debug-on-and-off class file. If you want to be sure though try it out . Ps. Often for debugging there is value in turning off optimization. That..
How difficult is it to turn a “Java School” programmer into a C or C++ programmer? http://stackoverflow.com/questions/251007/how-difficult-is-it-to-turn-a-java-school-programmer-into-a-c-or-c-programme Java programmers with maybe a minute smattering of C . Often the C classes don't really prepare students for working in C.. management really everything Joel Spolsky says here . Often as far as I can tell a student will have some of those fundamental..
Java Arrays.equals() returns false for two dimensional arrays http://stackoverflow.com/questions/2721033/java-arrays-equals-returns-false-for-two-dimensional-arrays inherit their equals from their common superclass Object . Often we really want value equality for arrays of course which is..
Why does the (Sun) JVM have a fixed upper limit for memory usage (-Xmx)? http://stackoverflow.com/questions/3358328/why-does-the-sun-jvm-have-a-fixed-upper-limit-for-memory-usage-xmx system refuses their legitimate requests for more memory. Often the only option is to reboot. If the JVM ran with an unbounded..
static allocation in java - heap, stack and permanent generation http://stackoverflow.com/questions/3849634/static-allocation-in-java-heap-stack-and-permanent-generation based on other sources which may or may not be definitive. Often it is simplified inaccurate or just plain wrong. If you want..
Weird behaviour with Scanner#nextFloat http://stackoverflow.com/questions/4708219/weird-behaviour-with-scannernextfloat if you're not handling an end of line token appropriately. Often if you use Scanner#next### except for nextLine and you reach..
http://stackoverflow.com/questions/7121213/singleton-instantiation the need for synchronization 2. Double checked locking DCL Often people are scared about the cost of lock acquisition. I've read..
Hibernate, iBatis, Java EE or other Java ORM tool http://stackoverflow.com/questions/716532/hibernate-ibatis-java-ee-or-other-java-orm-tool problem. That comes at the cost of rigidity however. Often in an application you will need bits and pieces of data from..
Selenium checkbox attribute “checked” http://stackoverflow.com/questions/8187772/selenium-checkbox-attribute-checked Webdriver then the item you are looking for is Selected. Often times in the render of the checkbox doesn't actually apply the..
Whats the best way to recursively reverse a string in Java? http://stackoverflow.com/questions/859562/whats-the-best-way-to-recursively-reverse-a-string-in-java in Java I have been messing around with recursion today. Often a programming technique that is not used enough. I set out to..
How to find the cpu utilization(%) of a java class [closed] http://stackoverflow.com/questions/9412618/how-to-find-the-cpu-utilization-of-a-java-class profiler and it can be the real cause of your problem. Often performance problems are due to the speed of you disk network..
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