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  • Exception is swallowed by finally

    - by fiction
    static int retIntExc() throws Exception{ int result = 1; try { result = 2; throw new IOException("Exception rised."); } catch (ArrayIndexOutOfBoundsException e) { System.out.println(e.getMessage()); result = 3; } finally { return result; } } A friend of mine is a .NET developer and currently migrating to Java and he ask me the following question about this source. In theory this must throw IOException("Exception rised.") and the whole method retIntExc() must throws Exception. But nothing happens, the method returns 2. I've not tested his example, but I think that this isn't the expected behavior. EDIT: Thanks for all answers. Some of you have ignored the fact that method is called retIntExc, which means that this is only some test/experimental example, showing problem in throwing/catching mechanics. I didn't need 'fix', I needed explanation why this happens.

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  • Interface name as a Type

    - by user1889148
    I am trying to understand interfaces in Java and have this task to do which I am a stack with. It must be something easy, but I don't seem to see the solution. Interface contains a few methods, one of them should return true if all elements of this set are also in the set. I.e. public interface ISet{ //some methods boolean isSubsetOf(ISet x); } Then the class: public class myClass implements ISet{ ArrayList<Integer> mySet; public myClass{ mySet = new ArrayList<Integer>(); } //some methods public boolean isSubsetOf(ISet x){ //method body } } What do I need to write in method body? How do I check that the instance of myClass is a subset of ISet collection? I was trying to cast, but it gives an error: ArrayList<Integer> param = (ArrayList<Integer>)x; return param.containsAll(mySet);

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  • How does one search/poll all modal info in a frame automatically?

    - by user310631
    As you'll no-doubt be able to tell momentarily, I have little knowledge of the programming world. That being said, here goes.... In this scenario, there's a Java-based game that has a map of the game world oriented in an X, Y coordinate tile system. Some of the grid tiles are player cities, some are non-player locations. The game runs inside a frame in the browser, the X, Y coordinate map feature is one optional view, and the entire map is not available to view at any one time. Each grid tile has an "Onclick" event and an "Onmouseover" event. The mouseover event is a tooltip, the click event is something called a "modal" that has information specific to that tile. What I'd like to find out is: How can I poll all the grid tiles' "modal" information using some kind of script or other auto-running polling feature?

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  • Warning vs. error

    - by Samuel
    I had an annoying issue, getting a "Possible loss of precision" error when compiling my Java program on BlueJ (But from what i read this isn't connected to a specific IDE). I was surprised by the fact that the compiler told me there is a possible loss of precision and wouldnt let me compile/run the program. Why is this an error and not a warning saying you might loose precision here, if you don't want that change your code? The program runs just fine when i drop the float values, it wouldn't matter since there is no point (e.g [143.08, 475.015]) on my screen. On the other hand when i loop through an ArrayList and in this loop i have an if clause removing elements from the ArrayList it runs fine, just throws an error and doesn't display the ArrayList [used for drawing circles] for a fraction of a second. This appears to me as a severe error but doesn't cause (hardly) any troubles, while i wouldn't want to have such a thing in my code at all. What's the boundary?

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  • insert a date in mysql database

    - by kawtousse
    I use a jquery datepicker then i read it in my servlet like that: String dateimput=request.getParameter("datepicker");//1 then parse it like that: System.out.println("datepicker:" +dateimput); DateFormat df = new SimpleDateFormat("MM/dd/yyyy"); java.util.Date dt = null; try { dt = df.parse(dateimput); System.out.println("date imput parssé1 est:" +dt); System.out.println("date imput parsée2 est:" +df.format(dt)); } catch (ParseException e) { e.printStackTrace(); } and insert query like that: String query = "Insert into dailytimesheet(trackingDate,activity,projectCode) values ("+df.format(dt)+", \""+activity+"\" ,\""+projet+"\")"; it pass successfully untill now but if i check the record inserted i found the date: 01/01/0001 00:00:00 l've tried to fix it but it still a mess for me.

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  • Is there an easy way to concatenate several lines of text into a string without constantly appending

    - by Marshmellow1328
    So I essentially need to do this: String text = "line1\n"; text += "line2\n"; text += "line3\n"; useString( text ); There is more involved, but that's the basic idea. Is there anything out there that might let me do something more along the lines of this though? DesiredStringThinger text = new DesiredStringThinger(); text.append( "line1" ); text.append( "line2" ); text.append( "line3" ); useString( text.toString() ); Obviously, it does not need to work exactly like that, but I think I get the basic point across. There is always the option of writing a loop which processes the text myself, but it would be nice if there is a standard Java class out there that already does something like this rather than me needing to carry a class around between applications just so I can do something so trivial. Thanks!

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  • Is it possible to shrink rt.jar with ProGuard?

    - by PatlaDJ
    Is there a procedure by which you can optimize/shrink/select/obfuscate only 'used by your app' classes/methods/fields from rt.jar provided by Sun by using some optimization software like ProGuard (or maybe other?). Then you would actually be able to minimize the download size of your application considerably and make it much more secure ? Right? Related questions: Do you know if Sun's "jigsaw project" which is waited to come out, is intended to automatically handle this particular issue? Did somebody manage yet to form an opinion about Avian java alternative? Please share it here. Thank you.

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  • generating class from hibernate mapping file

    - by Mrityunjay
    hi, i have one mapping file viz. student.hbm.xml.. i need to generate Student.java from the same. the file is below :- <?xml version="1.0" encoding="UTF-8"?> <hibernate-mapping> <class name="org.hibernate.entity.ClassRoom" table="class_room"> <id name="roomId" column="room_id" type="int"/> <property name="roomClass" column="room_class" type="string"/> <property name="floor" column="floor" type="int"/> <property name="roomMaster" column="room_mast" type="string"/> </class> </hibernate-mapping> is there any way i can create the class file from the above file.please help...

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  • Randomize numbers within a subset

    - by Samuel
    I have a array of integer numbers (say 1,2,3,4,5 or 1,2,3, ... 10 or 1,2,3, ... 50) from which I would like to get a random set of numbers ordered differently every time. Is there a utility method to do this? e.g. for 1,2,3,4,5 post randomization it might be either [1,5,4,2,3 or 2,1,3,5,4 or 3,1,2,4,5 or ...] I would like to know if there is a java utility method / class which already provides this capability?

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  • ready to use design pattern APIs for PHP?

    - by ajsie
    i know that in Java you can use their built-in APIs for design pattern. eg. if you want to use the observer pattern, you just have to extend your Subject class with the Observable class. is this possible for PHP? are there any libraries for the design patterns ready to use. in this way you don't have to reinvent the wheel and you also let many developers follow a standard. does Zend library have these API:s?

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  • ChoiceFormat.setChoices confusion about format parameter type and documentation

    - by polygenelubricants
    From the java.text.ChoiceFormat API: setChoices(double[] limits, String[] formats): Set the choices to be used in formatting. Parameters: limits - contains [...] formats - are the formats you want to use for each limit. They can be either Format objects or Strings. When formatting with object Y, if the object is a NumberFormat, then ((NumberFormat) Y).format(X) is called. Otherwise Y.toString() is called. I'm having difficulties understanding the documentation for the formats parameter: how can you possibly pass a Format/NumberFormat object to setChoices if it's declared String[] formats? Note that interestingly, the getters counterpart of setChoices are declared as follows: double[] getLimits() Object[] getFormats() -- not String[]!!! Is this a bug in the API? Should the setter have been declared setChoices(double[], Object[]) instead, or am I not understanding how to use setChoices correctly?

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  • Custom ArrayList serialization

    - by rayman
    Hi, i was trying to serialize an ArrayList which contacins custom objects. I`am serializing it in a servlet(server side), and deserialize at the client side. (using ObjectOutputStream,ObjectInputStream) it worked fine, when I work with ArrayList< String but when i tried it with ArrayList< MyObject i couldnt get any results in the client side, this is the exception: java.lang.ClassNotFoundException: web.MyObject *ofcourse that i have done this: MyObject implements Serializable ... MyObject contains only String fields in it. what have I done worng? Thanks, ray.

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  • Switch to BigInteger if necessary

    - by fahdshariff
    I am reading a text file which contains numbers in the range [1, 10^100]. I am then performing a sequence of arithmetic operations on each number. I would like to use a BigInteger only if the number is out of the int/long range. One approach would be to count how many digits there are in the string and switch to BigInteger if there are too many. Otherwise I'd just use primitive arithmetic as it is faster. Is there a better way? Is there any reason why Java could not do this automatically i.e. switch to BigInteger if an int was too small? This way we would not have to worry about overflows.

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  • the characters except 0x00-0x7F are not been shown when converted to "UTF-8" from "ISO-8859-1"

    - by Mike.Huang
    I need to get a string from URL request of brower, and then create a text image by requested text. I know the default encoding of the Java net transmission is "ISO-8859-1", it can works normally with all characters what defined in "ISO-8859-1". But when I request a multi-byte Unicode character (e.g. chinese or something like ¤?), then I need to decode it by "UTF-8" from "ISO-8859-1". My codes like: String reslut = new String(requestString.getBytes("ISO-8859-1"), "UTF-8"); Everything is fine, but I found some characters in ISO-8859-1 are not been shown now, which characters are 0x80 - 0xFF(defined in" ISO-8859-1"), i.e. the characters except 0x00-0x7F are not been shown when converted to "UTF-8" from "ISO-8859-1" Any other method can solve this query?

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  • Mocking my custom dependencies with Spring

    - by Brabster
    Is is possible to declare mocks using some mocking framework for my own classes declaratively with Spring? I know there are some standard mocks available in Spring, but I'd like to be able to mock out my own classes declaratively too. Just to check I'm not going about this the wrong way: the idea is to have a pair of JUnit test and Spring config for each integration test I want to do, mocking everything except the specific integration aspect I'm testing (say I had a dependency on two different data services, test one at a time) and minimising the amount of repeated Java code specifying the mocks.

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  • Have parameters in Dao methods to get entities the most efficient way for read-only access

    - by Blankman
    Allot of my use of hibernate, at least for that data that is presented on many parts of the web application, is for read-only purposes. I want to add some parameters to my Dao methods so I can modify the way hibernate pulls the data and how it handles transactions etc. Example usage: Data on the front page of my website is displayed to the users, it is read-only, so I want to avoid any session/entity tracking that hibernate usually does. This is data that is read-only, will not be changed in this transaction, etc. What would be the most performant way to pull the data? (the code below is c#/nhibernate, I'm implementing this in java as I learn it) public IList<Article> GetArticles() { return Session.CreateCriteria(typeof(Article)) // some where cluase }

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  • frame by frame animation not running

    - by abc
    well,i am a newbie to android..and i dont know whats wrong in my code.. this is my xml file <?xml version="1.0" encoding="utf-8"?> <animation-list xmlns:android="http://schemas.android.com/apk/res/android" id="selected" android:oneshot="false"> <item android:drawable="@drawable/w1" android:duration="50" /> <item android:drawable="@drawable/w2" android:duration="50" /> </animation-list> my java file ImageView img = (ImageView)findViewById(R.id.s); img.setBackgroundResource(R.anim.shape_animation); // Get the background, which has been compiled to an AnimationDrawable object. AnimationDrawable frameAnimation = (AnimationDrawable) img.getBackground(); // Start the animation (looped playback by default). frameAnimation.start();

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  • how to get a specific class object

    - by user1275129
    I am still quite new to class concept. I have a problem here. for example, i have a class called class p{ int id; p(id){ //constructor } } now, i want to make instances of class p. After i have all the instances. i want to build a function get_p(pid) to return the specific class p which id=pid, how can i write this part? I have read c++ and java class tutorials, but i cant sort this out. please help me.

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  • Delegation, is this just opinionated or is there a common pattern?

    - by user1446714
    If I have a java class containing substantial code and I wish to add extra features, am I right in thinking the delegate class would have the additional features added as methods. Then my original class would create the delegate object and just call the extra functionality via the delegate instance? I am being told by somebody else that my original class should become the delegate and that the class containing the new functionality should contain an instance of the original class, to use as a delegate? This seemed a little backward to me, because there would be far more delegate calls because most of the code is now in the delegate.... I was always under the impression the delegate object would contain the additional new behaviour and an instance of it would be in the original class to inboke the new behaviour from?

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  • getTextContent from Node with whitespace character normalization

    - by Nayn
    Hi, I am working with XPATH, Java and want to extract some text out of one html page. The text is located under some div with some whitespace characters in between, like &nbsp; <br> etc. I want these to be converted into 'space' and 'newline' respectively while extracting. The method I am using to extract text is Element.getTextContent() which does not respect whitespace characters. Could somebody tell me if there is a way to extract text with whitespace normalization OR Extract whole html markup under the 'Node' so that i could replace it by myself. Thanks Nayn

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  • how to get an instance of an XMLEventAllocator?

    - by kostja
    I am trying to follow the recommended way of parsing XML with StAX using sun's Cursor-to-Event Example for Java EE 5. You are supposed to traverse the XML via the Cursor API and allocate an XMLEventusing an XMLEventAllocator when necessary. Awkwardly, sun's own example does not compile (at least not with JDK 1.6, even with 1.5 code compliance). The example tries to instantiate an allocator via new, but the according implementation classes in the JDK are not accessible externally. After reading the JavaDocs and searching the web I have found literally nothing. One could implement the XMLEventAllocator interface from scratch, but it seems really wrong, when there are perfectly good implementations in the JDK, besides not being an expert in StAX makes it difficult to get it right.

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  • Android XML file doesn't save

    - by Shane
    I'm writing a game with LibGDX, and I'm trying to save an XML file, but there's always an exception (java.io.FileNotFoundException: /data/Slugfest/teams/Team1.xml: open failed: ENOENT (No such file or directory)) when saving the file. This code saves the file. public void save() { try { TransformerFactory transformerFactory = TransformerFactory.newInstance(); Transformer transformer = transformerFactory.newTransformer(); DOMSource source = new DOMSource(doc); StreamResult result; if (Gdx.app.getType() == ApplicationType.Android) { result = new StreamResult(new File("/data/Slugfest/teams/" + name + ".xml")); } else { result = new StreamResult(new File(name + ".xml")); } transformer.transform(source, result); Gdx.app.log("Slugfest", "File saved."); } catch (TransformerException tfe) { Gdx.app.log("Slugfest", tfe.getLocalizedMessage()); } } My manifest file includes the WRITE/READ_EXTERNAL_STORAGE permissions, by the way.

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  • Checking JRE version inside browser

    - by Brian Lewis
    Basically, I'm wanting to figure out the best way to check the user's JRE version on a web page. I have a link to a JNLP file that I only want to display if the user's JRE version is 1.6 or greater. I've been playing around with the deployJava JavaScript code (http://java.sun.com/javase/6/docs/technotes/guides/jweb/deployment_advice.html) and have gotten it to work in every browser but Safari (by using deployJava.versionCheck). For whatever reason, Safari doesn't give the most updated JRE version number - I found this out by displaying the value of the getJREs() function. I have 1.6.0_20 installed, which is displayed in every other browser, but Safari keeps saying that only 1.5.0 is currently installed. I've also tried using the createWebStartLaunchButtonEx() function and specifying '1.6.0' as the minimum version, but when I click the button nothing happens (in any browser). Any suggestions?

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  • How can I create or assign a method to temp (WindowAdapter)?

    - by Doug Hauf
    I want to create an instance of the WindowAdapter and put my method for windowClosing in it and then sent the temp into the f.addWindowListener(temp) can this be done. Java will not let me create an instance of WindowAdapter like below. WindowAdapter temp = new WindowAdapter(); <-- Does not compile How could this be done? Code: public static void main(String args[]) { setLookFeel(); JFrame f = new JFrame("Hello World Printer..."); WindowAdapter temp; f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); JButton printButton = new JButton("Print Hello World"); printButton.addActionListener(new HelloWorldPrinter()); f.add("Center", printButton); f.pack(); f.setVisible(true); }

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  • Designing a peer to peer network

    - by Varun
    I am designing a simple peer to peer network. The basic architecture will be as follows: A central server- that keeps track of all the peers. The job of this server is to keep track of all the peers that join the network. Every peer could do things: a. Download a file from it's peer b. Push a file (send a file) to it's peer. Could anybody please tell me what would be the best design for such a system? What would be the problems that i might run into and so on. I am planning to use Java as the programming language to implement. Would it be a good choice? Also, is it necessary that i would need a Linux box to develop the system? or is it fine if i use a Windows machine? Your help will be much appreciated! Thanks!

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