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java Programming Glossary: averageIs a Java hashmap really O(1)? http://stackoverflow.com/questions/1055243/is-a-java-hashmap-really-o1 on the answers it appears O 1 is actually wrong even for average case. The wikipedia article also states that the complexity.. The wikipedia article also states that the complexity for average case is O 1 n k which equates to O n after removal of lower.. to the growth rate within respect either to best worst or average case. Best case is basically worthless as it's rarely if ever..
How to “scan” a website (or page) for info, and bring it into my program? http://stackoverflow.com/questions/2835505/how-to-scan-a-website-or-page-for-info-and-bring-it-into-my-program hassle with verbose Node and NodeList like classes in the average Java DOM parser . Here's a basic kickoff example just put the..
Fastest way to determine if an integer's square root is an integer http://stackoverflow.com/questions/295579/fastest-way-to-determine-if-an-integers-square-root-is-an-integer slower. This makes sense because the binary chop will on average require 16 passes to find the square root of a 64 bit number...
When to use LinkedList<> over ArrayList<>? http://stackoverflow.com/questions/322715/when-to-use-linkedlist-over-arraylist to an ArrayList is O n in the worst case but constant on average. So depending on the operations you intend to do you should..
http://stackoverflow.com/questions/325443/generate-uuid-in-java UUID contains 58 bits of randomness which means you on average need to generate 2^29 UUIDs to get a collision compared to 2^61..
If profiler is not the answer, what other choices do we have? http://stackoverflow.com/questions/4387895/if-profiler-is-not-the-answer-what-other-choices-do-we-have get is governed by another distribution BetaPrime and its average is 4. So if you take 3 samples see a problem on 2 of them and.. see a problem on 2 of them and eliminate that problem on average you will make the program four times faster. It's high time..
how can I convert String to SecretKey http://stackoverflow.com/questions/4551263/how-can-i-convert-string-to-secretkey oracle attacks they require 128 tries per byte or lower on average independent of algorithm or key size . You will need to use..
How to monitor the computer's cpu, memory, and disk usage in Java? http://stackoverflow.com/questions/47177/how-to-monitor-the-computers-cpu-memory-and-disk-usage-in-java OperatingSystemMXBean.getAvailableProcessors load average per cpu for memory OperatingSystemMXBean.getTotalPhysicalMemorySize..
How to lock compiled Java classes to prevent decompilation? http://stackoverflow.com/questions/49379/how-to-lock-compiled-java-classes-to-prevent-decompilation password based encryption technique. Now in this case any average Java person can use JAD to decompile the class file and easily..
Why does JSF need to save the state of UI components on the server side? http://stackoverflow.com/questions/5474316/why-does-jsf-need-to-save-the-state-of-ui-components-on-the-server-side all the way to the end . Mojarra for example does that. An average form with 10 input fields each with a label and message and..
http://stackoverflow.com/questions/5800649/detect-silence-when-recording sum else for int ii 0 ii raw.length ii sum raw ii double average sum raw.length double sumMeanSquare 0d for int ii 0 ii raw.length.. int ii 0 ii raw.length ii sumMeanSquare Math.pow raw ii average 2d double averageMeanSquare sumMeanSquare raw.length double.. ii sumMeanSquare Math.pow raw ii average 2d double averageMeanSquare sumMeanSquare raw.length double rootMeanSquare Math.sqrt..
Math.random() versus Random.nextInt(int) http://stackoverflow.com/questions/738629/math-random-versus-random-nextintint 53 . Random.nextInt n uses Random.next less than twice on average it uses it once and if the value obtained is above the highest..
advanced formatted text field input manipulation? http://stackoverflow.com/questions/8703464/advanced-formatted-text-field-input-manipulation it to handle multiple fields as shown below. Finding the average is now a simple change to update . import java.awt.EventQueue..
Is it safe to use a static java.sql.Connection instance in a multithreaded system? http://stackoverflow.com/questions/9428573/is-it-safe-to-use-a-static-java-sql-connection-instance-in-a-multithreaded-syste open during the entire application's lifetime. The average database will reclaim the connection whenever it's been open..
How do I get this code to stop input when the sum exceeds 100 and still preform the sum and average? http://stackoverflow.com/questions/18797170/how-do-i-get-this-code-to-stop-input-when-the-sum-exceeds-100-and-still-preform JOptionPane.showMessageDialog null Count counter 1 Sum sum Average average Test to see if sum is greater than 100 and if so display.. JOptionPane.showMessageDialog null Count counter Sum sum Average average if sum 100 JOptionPane.showMessageDialog null Count.. JOptionPane.showMessageDialog null Count counter 1 Sum sum Average average java loops for loop while loop share improve this..
Size of a byte in memory - Java http://stackoverflow.com/questions/229886/size-of-a-byte-in-memory-java Size for LotsOfBytes endMem startMem System.out.println Average size endMem startMem double SIZE System.gc startMem getMemory.. Size for LotsOfInts endMem startMem System.out.println Average size endMem startMem double SIZE Make sure nothing gets collected.. Output on my box Size for LotsOfBytes 88811688 Average size 88.811688 Size for LotsOfInts 327076360 Average size 327.07636..
http://stackoverflow.com/questions/3918189/fast-compression-in-java for a large CSV file. The latency is for a 5KB block. Average latency 48532 ns. Bandwidth 91.0 MB s. Average latency 52560.. 5KB block. Average latency 48532 ns. Bandwidth 91.0 MB s. Average latency 52560 ns. Bandwidth 83.0 MB s. Average latency 47602.. 91.0 MB s. Average latency 52560 ns. Bandwidth 83.0 MB s. Average latency 47602 ns. Bandwidth 93.0 MB s. Average latency 51099..
How to monitor the computer's cpu, memory, and disk usage in Java? http://stackoverflow.com/questions/47177/how-to-monitor-the-computers-cpu-memory-and-disk-usage-in-java following for cpu usage OperatingSystemMXBean.getSystemLoadAverage OperatingSystemMXBean.getAvailableProcessors load average per.. and File.getUsableSpace Limitations The getSystemLoadAverage and disk space querying methods are only available under Java.. to all platforms i.e. it's been reported that getSystemLoadAverage returns 1 on Windows . EDIT 2011 08 18 Although originally licensed..
http://stackoverflow.com/questions/5846183/arraylist-vs-linkedlist for int i 0 i TEST i sum buildArrayList System.out.println Average time to build array list sum TEST public long buildArrayList..
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