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• How to time Java program execution speed

  - by George Mic

  Sorry if this sounds like a dumb question but how do you time the execution of a java program? I'm not sure what class I should use to do this. I'm kinda looking for something like: //Some timer starts here for (int i = 0; i < length; i++) { // Do something } //End timer here System.out.println("Total execution time: " + totalExecutionTime); Thanks

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• How to find buggy class in java?

  - by I.Randanad

  I have a big program on java, that uses multithreading. In some case, the program starts loading 100% of three cores of my eigth cores system. In normal use, the program use all cores of 1-2 percent loading. How can i find a class, that overloading cores?

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• parsing JSON in java ?

  - by bukuai

  How to parsing JSON in java? { "code": 100, "message": "SUCCESS", "result": { "list": [ { "cardNumber": "ALUFZZ5SZ1Q5", "expireTime": 1270742400, "surplusThreshold": 4, "uid": 771292, "useTime": 1270214375, "wareId": 1145 }, { "cardNumber": "ALUFZZ5SZ1QD", "expireTime": 1270828800, "surplusThreshold": 7, "uid": 784289, "useTime": 1270302200, "wareId": 1145 }, { "cardNumber": "ALUFZZ5SZ1RC", "expireTime": 1270828800, "surplusThreshold": 10, "uid": 773664, "useTime": 1270300871, "wareId": 1145 }, { "cardNumber": "ALUFZZ5SZ1UM", "expireTime": 1270828800, "surplusThreshold": 10, "uid": 779560, "useTime": 1270282841, "wareId": 1145 }, { "cardNumber": "ALUFZZ5SZ1VT", "expireTime": 1270656000, "surplusThreshold": 2, "uid": 754099, "useTime": 1270106775, "wareId": 1145 } ], "pageCount": 61, "pageIndex": 2, "pageSize": 5, "recordCount": 308 } }

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• Is Java worth learning in my late fourties?

  - by bobi

  Hi guys. First I want to say is that I am 37 years old and not from programer background (actualy from biology). And my question is should I start learning java? I have coded in php and javascript for a year and a half. Every answer would be appreciated Thanks in advance Bobi.

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• couldn't start a java application as a windows service

  - by rgksugan

  I have written a java application which is a RMI server. I need to start rmiregistry to run this application and i also want my apllication to start automatically when the system starts. I have converted my application into a windows servise. When i try to start my service it shows this error Error 1067: The process terminated unexpectedly Is it because my program throws an exception when my application is started before the rmiregistry is started.

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• Properly match a Java string literal

  - by Fork

  Hi, I am looking for a Regular expression to match string literals in Java source code. Is it possible?

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• Where Java applets game portals?

  - by StudioFortress

  I have started making some small Java games that run in a browser and have found a couple of game portals where I can host then (GameJolt.com, JavaGameTomb.com and Games4j.com). Most of the other portals I find either only allow Flash or offer the games for download. Apart from those above, what other portals exist that allow hosting applets?

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• Wait For Return Key Press Using Java Scanner

  - by Gordon

  What would be the best way to wait for a return key press from the user using the Java Scanner Class? In a command line tool I would like the user to confirm before carrying out an action. Please correct me if there a more standard way of doing this in a command line tool.

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• Desktop Screen Streaming in Java

  - by Joannes

  Can anyone tell me how to stream my desktop through sockets in Java? I tried using screen captures and sending them 1 at a time but it's no good. Too slow! I think to redirect the video stream would be better.

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• Get system information using java (embedded in a page)

  - by Anant

  Is there any way I can get system info, like processor/ram etc (preferably cross platform, in browser)? I am looking to implement this in a website, so I need it in either flash or a java applet.

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• Parallel Web Service Calls in Java

  - by java_pill

  Is there anyway to make web service calls from a Java client app. (Apache Axis based) in parallel? Does async style Web Service client (Apache Axis based) help?

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• Java - get index of key in HashMap?

  - by llm

  In java if I am looping over the keySet() of a HashMap, how do I (inside the loop), get the numerical index of that key? Basically, as I loop through the map, I want to be able to get 0,1,2...I figure this would be cleaner than declaring an int and incrementing with each iteration. Thanks.

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• What is the significance of the reverse domain name for java package structure

  - by Vaishak Suresh

  Why do we use reverse domain name like com.something. or org.something. structure for java packages? I understand this brings in some sort of uniqueness, but why do we need this uniqueness?

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• how to create a auto closing messagebox in java

  - by Nubkadiya

  i want to create a messagebox which will be automatically close without users input. i tried reading couple of java tutorials. its a timer class. but i couldnt find the code examples. can someone please help me to do it. a small code example would be great

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• Java: ECC (error correcting code) library?

  - by Jason S

  Is there a well-known implementation, that has friendly open-source licensing (not GPL), of an ECC (error correcting code) library (e.g. Reed-Solomon) for Java?

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• roundoff double values in Java

  - by S.PRATHIBA

  Hi all, I have a matrix.I found the 10th power of matrix using Java.After finding the 10th power,I need to round off the double values to 3 decimal places.Please help me to round off the double values in the matrix to 3 decimal places.

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• Double to scientific notation in java

  - by Daniel G. R.

  Hi everyone, I have a double number like 223.45654543434 and I need to show it like 0.223x10E-3 for example, how can I do it in java???????? URGENT!!!!!!!!!!! thanks!

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• Elegant min/max absolute values in java

  - by Stefano Borini

  I need to get the minimum and maximum values in a collection of floating point values, after applying an absolute value conversion. In python I would do this min(map(abs, [-5, -7, 10, 2])) how can I perform the same operation in java in the most elegant way?

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• Equivalent of IllegalArgumentException of Java in C++

  - by vito

  In Java if an input argument to a method is invalid, we can throw an IllegalArgumentException (which is of type RuntimeException). In C++, there is no notion of checked and unchecked exceptions. Is there a similar exception in standard C++ which can be used to indicate a runtime exception? Or is there a common style not in the standard but everyone follows in practice for a situation like this? Or, should I just create my own custom exception and throw it?

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• Problem in java.util.Set.addAll() method

  - by Yatendra Goel

  I have a java.util.Set<City> cities and I need to add cities to this set in 2 ways: By adding individual city (with the help of cities.add(city) method call) By adding another set of cities to this set (with the help of cities.addAll(anotherCitiesSet) method call) But the problem in second approach is that i don't know whether there were any duplicate cities in the anotherCitiesSet. I want to do some processing whenever a duplicate entry is tried to be entered in thecities set.

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• Simple/Direct way of contructing a HTML string in Java

  - by das_weezul

  In python I can construct a HTML string without worrying about escaping special characters like < or " by simply enclosing the string in triple quotes like: html_string = """ <html> <body> <p>My text with "quotes" and whatnot!<p> </body> </html> """ Is there a similar way to do this in Java?

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• About using OpenCV library in Java.

  - by Chetan

  Hi i am using Ubuntu linux, I have installed OpenCV library. How to use OpenCV library in Java programming?

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• Should Java raw types be deprecated?

  - by Paul Croarkin

  Should a future release of Java deprecate the use of raw types to force the migration to generics? I could also see having raw types not allowed by default but allowing them via a compile flag for legacy code.

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• get active window of other programs using java

  - by stdnoit

  i am trying to make java application that can get the information from other active window program ...such as information bar or even screenshot of other active window is JNI the only option in this case? thanks

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• Detect use of older Java libraries

  - by Tony Morris

  Is there a third party library to detect the use of a Java 1.5 library when compiling with a 1.5 compiler with -source 1.4 and -target 1.4? I could use a 1.4 rt.jar in the bootclasspath however I hope there is a better way. To be used, for example, to fail the compile/build if a newer library is used.

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