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• How to delete only the content of a file in java?

  - by Santhosh

  hi, May i please know how can i delete the content of the file in java? Thanks in advance.

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• Best location to put your CSS and JS files in a Mavenized Java Web app?

  - by MexicanHacker

  I have a Web application in maven that follows this structure: src `-- main |-- java |-- resources `-- webapp Is is better to put it in the main folder and then the maven plug in will try to move it or I should put it inside the webapp folder and why?

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• Which logger framework in java shall one use based on performance and consistency criterion?

  - by Vaibhav Kamble

  Which logger framework in java shall one use based on performance and consistency criterion? I need to use it in highly concurrent application and do not wish to use any log wrappers. Please suggest based on these requirements. -Vaibhav

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• How to create an Array, ArrayList, Stack and Queue in Java?

  - by theband

  I was reading a Java article, but found no differences in the declaration and was confused over. Can anyone list me out this? Added the Article http://www.theparticle.com/javadata2.html

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• Difference in System. exit(0) , System.exit(-1), System.exit(1 ) in java

  - by girinie

  Hi I like to know difference between the following in java System.exit(0); System.exit(-1); System.exit(1); When do I have to use the above code appropriately. Thanks

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• What is a best practice of writing hash function in java?

  - by den-javamaniac

  Hi. I'm wondering what is the best practice for writing #hashCode() method in java. Good description can be found here. Is it that good?

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• Java - is it possible to read a file line by line, stop, and then immediately start reading bytes wh

  - by hatorade

  I'm having an issue trying to parse the ascii part of a file, and once I hit the end tag, IMMEDIATELY start reading in the bytes from that point on. Everything I know in Java to read off a line or a whole word creates a buffer, which ruins any chance of getting the bytes immediately following my stop point. Is the only way to do this read in byte-by-byte, find new-lines, reconstruct everything prior to the new-line, see if it's my end tag, and go from there?

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• What files should be added to SVN in an eclipse Java project?

  - by Jake Petroules

  I have a Java project I'd like to commit to my SVN repository, created with eclipse. Now, what files (aside from the source code, obviously) are necessary? In the workspace root, there is a .settings folder with many files and subfolders, and inside the project folder there are two files - .classpath and .project, and another .settings folder with a single file - org.eclipse.jdt.core.prefs. Which of these files should be committed to SVN and which can be safely excluded?

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• How to modify/add code to the initComponents() method in Java on Net Beans?

  - by Ahmad Farid

  How to modify/add code to the initComponents() method in Java on Net Beans? When I try to add any line of code this area seems to be like read only and it's highlighted in gray! It's for security probably, but I suppose there is a way to disable that.

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• How can I make Swig correctly wrap a char* buffer that is modified in C as a Java Something-or-other

  - by Ukko

  I am trying to wrap some legacy code for use in Java and I was quite happy to see that Swig was able to handle the header file and it generate a great wrapper that almost works. Now I am looking for the deep magic that will make it really work. In C I have a function that looks like this DLL_IMPORT int DustyVoodoo(char *buff, int len, char *curse); This integer returned by this function is an error code in case it fails. The arguments are buff is a character buffer len is the length of the data in the buffer curse the another character buffer that contains the result of calling DustyVoodoo So, you can see where this is going, the result is actually coming back via the third argument. Also len is confusing since it may be the length of both buffers, they are always allocated as being the same size in calling code but given what DustyVoodoo does I don't think that they need be the same. To be safe both buffers should be the same size in practice, say 512 chars. The C code generated for the binding is as follows: SWIGEXPORT jint JNICALL Java_pemapiJNI_DustyVoodoo(JNIEnv *jenv, jclass jcls, jstring jarg1, jint jarg2, jstring jarg3) { jint jresult = 0 ; char *arg1 = (char *) 0 ; int arg2 ; char *arg3 = (char *) 0 ; int result; (void)jenv; (void)jcls; arg1 = 0; if (jarg1) { arg1 = (char *)(*jenv)->GetStringUTFChars(jenv, jarg1, 0); if (!arg1) return 0; } arg2 = (int)jarg2; arg3 = 0; if (jarg3) { arg3 = (char *)(*jenv)->GetStringUTFChars(jenv, jarg3, 0); if (!arg3) return 0; } result = (int)PemnEncrypt(arg1,arg2,arg3); jresult = (jint)result; if (arg1) (*jenv)->ReleaseStringUTFChars(jenv, jarg1, (const char *)arg1); if (arg3) (*jenv)->ReleaseStringUTFChars(jenv, jarg3, (const char *)arg3); return jresult; } It is correct for what it does; however, it misses the fact that cursed is not just an input, it is altered by the function and should be returned as an output. It also does not know that the java Strings are really buffers and should be backed by a suitably sized array. I think that Swig can do the right thing here, I just can't figure out from the documentation how to tell Swig what it needs to know. Any typemap masers in the house?

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• What is the most up-to-date way to write JAVA web applications and web-based front-end ?

  - by EugeneP

  What is the most up-to-date way to write JAVA web-based applications and front-end ? What is it? JSF, JSF2 or some framework like Spring MVC or Tapestry? What are pros and cons of each framework?

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• Get rid of redundant cast to javax.xml.bind.JAXBElement<java.lang.Boolean> warning from CXF-generate

  - by Binary255

  I generate some code using CXF from a WSDL-file. When compiling the code with version "1.6.0_16" with the flag -Xlint I get the following warning: warning: [cast] redundant cast to javax.xml.bind.JAXBElement<java.lang.Boolean> [javac] this.r = ((JAXBElement<Boolean> ) value); What does the warning mean, should I be worried? As I have generated and not written the code, what can I do to get rid of this specific warning?

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• I want to genrate following JSON dataobject using org.json.simple.JSONObject, how to do it in java?

  - by Abhishek

  Hi all, I want to genrate following JSON dataobject using org.json.simple.JSONObject, how to do it in java? { friends : [ { name: 'David', interests: 'Cooking', }, { name: 'Charles', interests: 'Hiking', }, { name: 'Mary', interests: 'Football', }, ] } If code snipet is provided then that will be really helpful! Regards, Abhi

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• What is the best way to use Ext JS as part of Java / Spring / Hibernate based web application?

  - by Igor Romanov

  We want to try Ext JS on new project. Is there any well-known best practice for integrating Ext JS with server side Java (Spring/Hibernate/JS) application? Is DWR a good choice for that?

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• How can JVM arguments be passed to apps started through java webstart in MacOS?

  - by siva

  We have a application which is triggered from browser. This application consumes around 800 mb of memory. This works perfectly when invoked from any browsers in windows OS. The same application when triggered from MacOS throws an out of memory exception which occurs when the application is short of memory. Is there any way to increase the memory allocated for apps running in mac os environment. Also please let me know how JVM arguments can be passed to apps started through java webstart in macOS.

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• Is this valid Java code? My teacher claims it is, but I'm really not so sure.

  - by Sergio Tapia

  Granted he didn't show us actual code here, just mentioned it, I found it extremely bizarre. For example, according to what he said this is valid Java: public class Person { String Name; int Age; { //These two braces just chilling together - VALID? :O } }

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• How do I apply the for-each loop to every character in a String in Java?

  - by oxinabox.ucc.asn.au

  So I want to iterate for each character in a string. So I thought: for (char c : "xyz") but I get a compiler error: StackCharTester.java:20: foreach not applicable to expression type How can I do this?

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• Do I need to javadoc every single method or just the 'main' method in java?

  - by Chris

  Java example method: //Stores the user input into an integer variable called 'choice' int choice = keyboard.nextInt(); Do I need to write javadoc for a simple method like this or should I only document the main method of any program, if so then what sort of things should I write for the main method? Thanks, Chris.

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• How to execute a blocking function that returns a value for a maximum amount of time in Java.

  - by gamernb

  How would I go about making a function that would do this in java. String result = null do { SendData() // Run Blocking Function: ReceiveData() Until it returns a result // or t seconds have elapsed // if something returned, result = something // else result = null } while(result == null);

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• How can I apply antialiasing to instances of Shape3D in Java?

  - by Jonathan

  How can I apply antialiasing to instances of Shape3D in Java? I have tried something along these lines: // enable antialiasing Appearance planeApp = new Appearance(); LineAttributes la = new LineAttributes(); la.setLineAntialiasingEnable(true); planeApp.setLineAttributes(la); myShape.setAppearance(planeApp);

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• Where we can I get a good study guide for java?

  - by Venkats

  Please suggests to me some good website to collect java materials for more specific. Thanks in Advance.

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• How to use Scanner to read silently from STDIN in Java?

  - by Nazgulled

  Hi, Is it possible to use the Java Scanner to read from STDIN silently? I mean, without outputting any pressed chars to the terminal?

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• Java, HashMaps and using Strings as the keys - does the string value get stored twice?

  - by MalcomTucker

  If I have a HashMap that looks like this: HashMap<String, MyObject> where the String key is a field in MyObject, does this string value get stored twice? So when I add entries: _myMap.put(myObj.getName(), myObj); Am I using double the String size in terms of memory? Or does Java do something clever behind the scenes? Thanks

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• Which SHA-256 is correct? The Java SHA-256 digest or the Linux commandline tool

  - by Peter Tillemans

  When I calculate in Java an SHA-256 of a string with the following method I get : 5e884898da2847151d0e56f8dc6292773603dd6aabbdd62a11ef721d1542d8 on the commandline I do : echo "password" | sha256sum and get 5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8 if we compare these more closely I find 2 subtle differences 5e884898da2847151d0e56f8dc6292773603dd6aabbdd62a11ef721d1542d8 5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8 or : 5e884898da28 47151d0e56f8dc6292773603d d6aabbdd62a11ef721d1542d8 5e884898da28 0 47151d0e56f8dc6292773603d 0 d6aabbdd62a11ef721d1542d8 Which of the 2 is correct here?

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• Is there something like the OllyDbg / SoftICE disassembler + debugger for java?

  - by Ran Biron

  Is there a utility similar to OllyDbg / SoftICE for java? I.e. execute class (from jar / with class path) and, without source code, show the disassembly of the intermediate code with ability to step through / step over / search for references / edit specific intermediate code in memory / apply edit to file... If not, is it even possible to write something like this (assuming we're willing to live without hotspot for the debug duration)?

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