Recent questions tagged Java

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java - Keep specific Annotation with proguard

I have two types of annotation in my project: Annotation1 and Annotation2. Both are runtime annotations. So, my ... possible? If not, why? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - When would a compiler choose StringBuffer over StringBuilder for String concatenation

I was looking at the String Javadoc when I noticed this bit about String concatenation: The Java ... any AbstractStringBuilder implementation? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Determining Appropriate Buffer Size

I am using ByteBuffer.allocateDirect() to allocate some buffer memory for reading a file into memory and then ... Thanks for any insight. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - TextField not updating dynamically

this is a really simple code in which text on a button is copied to a TextField. The code works fine but the ... (data); a.show(); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Change button background on touch

i want to change the green background of a button when this is touched without using OnTouchListener. i have ... k the background is changing) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - loop through JPanel

In order to initialize all JTextfFields on a JPanel when users click a "clear button", I need to loop ... JPanel in search of JTextFields? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Maven Jar Builder: Could not find or load main class

I have been trying for several days now to create an executable jar file for my muli-module maven project. ... find the main class? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - executing .jar file with an argument by mouse right-click on Windows?

I find the ChkBugReport to be very interesting: http://developer.sonymobile.com/knowledge-base/tools/analyse-your- ... way to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How can I commit a Play! JPA transaction manually?

Usually, Play! commits the transaction after a request completes successfully. What is the correct way to commit ... (p.id); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - JAXB mapping elements with "unknown" name

I have an XML which is out of my control on how it is generated. I want to create an object out of ... course the element count of is variable. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Method calls in EL

When I write Java webapps, I usually use JSTL tags. I think that these tags are great, except for one thing that ... the JCP doing this to us? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Running a JavaScript command from MATLAB to fetch a PDF file

I'm currently writing some MATLAB code to interact with my company's internal reports database. So far I can ... Java solution would work...) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How do I put graphics on a JPanel?

I am having a problem adding graphics to a JPanel. If I change the line from panel.add(new graphics()); to frame. ... (); GUI.createGUI(); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Is there any way to know that the CellStyle is already present in Workbook(to reuse) using POI or to Copy only Celstyle obj not reference

I want to write some records into excel but I got to know that the maximum cell styles in XSSFWorkbook ... 't implement cloneable interface. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - how to load same class from different jars

I have a class Client.java in two different jars jar1 & jar2 Now at run time i want to decide which Client.class ... jar2 } can i do that... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Ternary operator

Why the output of following code is 9.0 and not 9 ? If ternary operator is nothing but short form of if-else branch then ... ? 9.9 : 9)); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Which run first? default values for instance variables or Super Constructors?

According to the SCJP6 (Page 507) i found that instance variables are assigned default values before the superclass ... Init(7); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Android Studio E/dalvikvm: Could not find class... referenced from method

I encountered a problem that seems to have something to do with the libraries in android studio. I am having compiling ... 2.10 min sdk 4.0 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to change locale in a Struts action class?

I have an Action class, and I want to get the locale of my app and change it here, but I don't know how ... Action class. How can I do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Mapping a FunctionalJava Option<Type> with Hibernate

I have a hibernate-mapped Java object, JKL, which is full of a bunch of normal hibernate-mappable fields (like ... have to do? Thank you. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Junit SuiteClasses with a static list of classes

SuiteClasses will work just fine with a list of classes like {Test1.class,Test2.class}, but when I try to generate a ... 0] = MyTest.class; } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What is better? if..else or multiple simple if

talking about java performance .. what is better? if..else or multiple simple if if( condition ) { some_code ... in your thoughts Thnx ! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Convert int[] to comma-separated string

How can I convert int[] to comma-separated String in Java? int[] intArray = {234, 808, 342}; Result I ... intArray.toString(); // garbage result See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Configure Hibernate to use Oracle's SYS_GUID() for Primary Key

I am looking for a way to get hibernate to use oracle's SYS_GUID() function when inserting new rows. Currently ... and a database round trip. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Twitter4j authentication credentials are missing

I would like to make a tweet with Twitter4j in my Android app. Here is my code: //TWITTER SHARE. @Click (R.id ... me to fix it please? thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - JSP/JSTL using or not using <c:out> tags

i'm helping develop a java jsp jstl based web service and all dynamic objects are being inserted using ${object.foo ... that may be an issue. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Why is myString.equals("aString"); different from "aString".equals(myString);?

I heard several times that in using boolean equals(Object o) to compare Strings, it's better to put the constant ... (myString); Why is this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Class members in Fragment become null after Home button press and wait

Problem Description Application which I'm writing has 3 Fragments. Main Fragment Activity has a Search Box with ... gone"/> </RelativeLayout> See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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