Recent questions tagged Java

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java - Formatting Floating Point Numbers

I have a variable of type double, I need to print it in upto 3 decimals of precision but it ... (false); 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 - How to handle special characters in url as parameter values?

Can anyone suggest how to handle below url as values of parameter of strLocation is haveing special charecters ? ... )_+&async=true&newAccID=112 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 - Slow SecureRandom initialization

Suppose you do simple thing: public class Main { public static void main(String[] args) { long started = ... and may become frustrating... 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 use annotation validation in Spring with error message gotten from properties file?

I'm a Spring newbie. I set up validation in my domain class like this: public class Worker { @NotNull( ... question someone has done 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 - Why stringbuilder stops adding elements after using the null character?

When i am using the null character 'u0000', stringbuilder will stop appending new elements. For example: StringBuilder ... 1.6.0_38 on ubuntu. 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 - Call requires API level 11(current min is 8) android.app.Activity#onCreateView

I am a newbie to android, and I am developing an android application. But my package line gives this error in MainActivity ... ); } }); } } 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 - "abort preclean due to time" in Concurrent Mark & Sweep

I'm getting "abort preclean due to time" when running Concurrent Mark & Sweep in Java 6. What does it mean? Is ... before it did any real 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 - Import one FTL file inside another FTL file

I have created one DIV inside a FTL file and that DIV contain form now say i have another FTL file and i ... use this div in another FTL file 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 - jpa 2 hibernate limit (max results) to a CriteriaQuery

maybe it's a silly question but I cannot find the answer in the docs: How can set a limit to the CriteriaQuery using JPA2? 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 - How to Get Package Name of Source Class File in Android ?

I am using only one project to port lite and full versions for that I am just updating Manifest file ... of MyClass.java file programmatically? 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: Stop/start service created in onCreate()

I currently have a service that is started within the onCreate method of an activity using: Intent intentService = new ... (View.VISIBLE); } }; 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 calculate string font width in pixels?

I want to calculate string font width in pixels in android. I am having string array and I am appending all these ... . Thanks in advance...!!! 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 assert that lists are equal with testng?

I found an answer for junit, but need a solution for testng. Any ideas more usefull as writing an own for loop? 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 a limit for the number of files in a directory on an SD card?

I have a project written for Android devices. It generates a large number of files, each day. These are all ... files in the root directory. 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 - Can you write to a sockets input and output stream at the same time?

I have a Java application which is Voip. I am using the one socket to send and receive information at the same ... Please let me know whats up. See Question&Answers more detail:os...

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

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281 views

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java - How can I make sure a method is only called once by multiple threads?

I have the following structure: public void someMethod(){ //DO SOME STUFF try{ doSomeProcessing(); } catch ( ... decorator pattern to use it. 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 specify the ciphersuite to be used in SSL session

I have created a socket on port 443 as in the following line: socket = (SSLSocket) factory.createSocket(hostName, port ... (); //handshake . . 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 8 - How to install oracle-java8-installer on docker debian:jessie

I am trying to install java 8 through oracle-java8-installer on a debian:jessie docker container. The following is ... worked for me. Any idea? See Question&Answers more detail:os...

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

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444 views

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java - Spring boot + spring batch without DataSource

I'm trying to configure spring batch inside spring boot project and I want to use it without data source. I've ... DB as I dont want 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 - Double checked locking with ConcurrentMap

I have a piece of code that can be executed by multiple threads that needs to perform an I/O-bound ... initialization" problems that may happen. See Question&Answers more detail:os...

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

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336 views

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java - Is Collectors.joining(",") thread-safe?

Are java.util.stream.Collectors::joining implementations thread-safe? Can I do something like public final class ... into concurrency issues? See Question&Answers more detail:os...

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

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223 views

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java - Simple string as JSON return value in spring rest controller

Let's take a look at the following simple test controller (Used with Spring 4.0.3): @RestController public ... feature I don't understand? See Question&Answers more detail:os...

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

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356 views

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java - Stretch a row if data overflows in jasper reports

how do i stretch a row when data overflows the band height in jasper reports, I have set the stretch with overflow ... true but it doesn't 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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453 views

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java - You need to run build with JDK or have tools.jar on the classpath

I'm using Eclipse Luna to develop java maven applications. I am, or was, but am again now, using jdk1.7 ... which makes very little sense now. 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 use Spring ClassPathResource: with classpath: or classpath*: and leading / or not?

I having file in the location --src --> main --> config --> application --> context --> ... working of ClassPathResource and right solution? See Question&Answers more detail:os...

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

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234 views

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java - Confusing "override a private method"

I have two question on this code public class Override { private void f() { System.out.println("private f()"); ... Why is output "private f()" See Question&Answers more detail:os...

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

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257 views

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java - WebApplicationContext doesn't autowire

I write this test class : @ContextConfiguration(locations = { "classpath:/test/BeanConfig.xml" }) public ... main(RemoteTestRunner.java:197) See Question&Answers more detail:os...

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

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722 views

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java - How to resolve 'Implicit super constructor classA() is not visible. Must explicitly invoke another constructor'?

I am having a class 'ClassA' which is having private constructor. public final class ClassA{ private ClassA ... specifier of ClassA constructor. See Question&Answers more detail:os...

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

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