Java
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        Java – date that can be empty in FreeMarkerThis is part of my freemaker template: ${order.needByDate?if_exists?date} I hope it works as follows: >If needbyda……
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        Java XPath: get all elements that match the queryI want to make an XPath query on this XML file (as shown below): <?xml version="1.0" encoding="UTF-8"?> <!-- ……
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        How to start “main” in a new Java process?The question is simple How do I start a main method in another java process? Now I do this: startOptions = new String[……
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        Java – create a custom 404 / 500 error page in the play frameworkHow to create a global custom to use play to view their 404 / 505 error page? Solution In play framework 1, you only n……
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        Java – no virtualmachineerror guaranteeI come from C In the C world, we pay attention to exception security and note that mutator can provide different guara……
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        Java – how to solve the problem that the current thread cannot find a sessionI try to do the implementation of general Dao according to article Here is my genericdaoimpl class @SuppressWarnings("……
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        Writing a Russian PDF using the Java pdfbox LibraryI'm using a named PDF@R_694_2419 @Java library, trying to write text to PDF It works for English text, but when I try ……
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        Java: convert string date to month name year (MMM yyyy)I'm new to Java I am trying to convert the date from string to MMM yyyy format (March 2016) I tried this Calendar cal=……
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        Hindley Milner algorithm in JavaI'm writing a system based on simple data flow (imagine it like a LabVIEW editor / runtime written in Java) Users can ……
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        Is it acceptable in Java to use thread #stop() to kill a running thread?Unfortunately, you cannot specify a timeout when using regular expressions for strings in Java Therefore, if you don't……
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        Java: write large files?to greet, I am currently using bufferedwriter BufferedWriter mbrWriter=new BufferedWriter(new FileWriter(memberCSV)); ……
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        Java – Subversion: errors in previous versionsI like subversion's blame action (it shows the submission of the last change to each line in the source file) Alas, we……
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        Using generic type security in JavaI encountered generic behavior in Java and I didn't understand it at all (using my. Net background) public class TestG……
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        How to use Java annotations to modify the source code before final compilation?From the apt tool page, I can create annotation processors to generate new derived files (source files, class files, d……
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        Java – how to use a jobobject array? (JNI)Actually, I call a C function: What I want to do is get the value of the original object Considering the Java code dec……
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        Java – allows equal comparison between ‘Boolean’ and ‘object’?Following code public class TestComparison { public static void main(String[] args) throws Exception { boo……
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        Is DirectX feasible for Java?Is there an easy way to use DirectX in Java? In particular, DirectX's video API I know c# may be a more natural choice……
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        Is rxjava cache () the same as replay ()?I want to know if there is a cache () operator that can cache x emissions, but it will also expire after a specified t……
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        Java – how to callback after the view is fully rendered?How to callback after the view is fully rendered? I tried to call a method to take a screenshot of the parent view If ……
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        Java se: open the web page and click the buttonI have a Java 7 program (using webstart technology, only applicable to Windows 7 / 8 computers) I need to add a functi……
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        Java’s tostring() is equal to the clojure functionSome of the Java code I use calls toString () on my clojure function object, which returns something like # < ns $s……
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        Java – use common IO to compress the directory into a zipfileI am a beginner of Java programming. I am currently writing a program that must be able to compress and decompress Zip……
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        Java – spring, @ transactional and Hibernate lazy loadingI'm using spring hibernation All my hibernatedao directly use sessionfactory I have application layer - > service l……
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        Java – Rock Paper scissors for foldable solutionsJust experienced a variant of the game: Rock Paper scissor Lizard Spock I have written java code for a traditional r-p……
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        Java – how to use firebase to query equal to (value, key)?As a novice in firebase, I try to imitate a "where clause" request to retrieve a user's wallet in this simple use case……
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        Java – upgrade spring security oauth2I'm trying to change the spring security oauth2 configuration from 2.0 Upgrade from 0.rc1 to 2.0 3.RELEASE. I copied t……
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        Java – how to convert a 24 bit PNG to a 3-bit PNG using Floyd Steinberg dithering?How to use Floyd – Steinberg dithering to convert 24 bit PNG to 3-bit PNG? You should use Java awt. image. Bufferedima……
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        Java – iText: vertical alignment of pdftable cellsI tried to vertically align my avatar cell text in the middle of the cell height This is my code: PdfPCell c1 = new Pd……
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        Java – I can’t divide two numbers correctlyint percent = (score/numberOfQuestions)*100; int percent = (score/numberOfQuestions)*100; progressText.setText(score+"……
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        The purpose of static methods in JavaI'm confused about the use of static methods in Java. For example, if the main method is static, it makes sense, but w……
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        Java – double locking mode: disconnected?Why is this pattern broken? Is it good for me? Any ideas? public static Singleton getInst() { if (instace == null)……
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        Java – find out if sqlexception is raised due to repetitionI have a java program that is not related to the database. If sqlexception is thrown due to duplicate keys, I need to ……
