Recent questions tagged JAVA

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java - HashSet.remove() and Iterator.remove() not working

I'm having problems with Iterator.remove() called on a HashSet. I've a Set of time stamped objects. Before ... notice the lack of immutability. 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 - Unable to get Jacoco to work with Powermockito using offline instrumentation

Given that Jacoco doesn't play nicely with PowerMockito when instrumenting "on the fly", I've been trying to ... using an ant script ):- 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 - log4j 2 adding multiple colors to console appender

Hi I just downloaded and configured log4j-2. I am stuck on applying color codes to the SlowConsole console appender. ... it to be dim and bold 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 - Installing JDK without administrator privileges

I am trying to install JDK at office laptop but it says I need administrator privileges. I have only ... Kit without administrator rights? 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 it good to close() an inputstream?

Why is it necessary to close() java.io.InputStream or its subclasses? Now with java.io.OutputStream, say ... a memory leak is 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 - How do I pass multiple parameter in URL?

I am trying to figure out how to pass multiple parameters in a URL. I want to pass latitude and longitude ... from android device to server. 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: Source Encoding in UTF-8 not working?

i am converting a project from Ant to Maven and i'm having problems with a specific unit test which deals with ... i build the project with Ant. 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 predict the maximum call depth of a recursive method?

For the purposes of estimating the maximum call depth a recursive method may achieve with a given amount of ... have -Xss1000 set somewhere 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 are all of the Maven Command Line Options?

I'm looking for the list of options for Maven 2.2 but cannot find it. If someone knows the location please ... 3.8.1/maven-embedder/cli.html 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 does Collection.parallelStream() exist when .stream().parallel() does the same thing?

In Java 8, the Collection interface was extended with two methods that return Stream<E>: stream(), which returns a ... () does the same thing? 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 - Gson to HashMap

Is there a way to convert a String containing json to a HashMap, where every key is a json-key and the value ... <"location", "NewYork"> 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 - Google Cloud Endpoints limitations... any proposed solutions?

Am I correct in thinking that the goodness of Cloud Endpoints comes with the following limitations: The REST Api cannot ... , what is the ETA? 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 - percentage of two int?

I want to get two ints, one divided by the other to get a decimal or percentage. How can I get a ... I need the percentage or decimal) 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 @InjectMocks along with @Autowired annotation in Junit

I have a class A which is using 3 differnt classes with autowiring public class A () { @Autowired private B b; ... it even possible to do so? 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 - Will OpenJDK JVM ever give heap memory back to Linux?

We have a long-lived server process, that infrequently needs a lot of RAM for a short while. We see that once ... to go through all these hoops? 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 iterate through LinkedHashMap with lists as values

I have following LinkedHashMap declaration. LinkedHashMap<String, ArrayList<String>> test1 my point is how can i iterate ... > )test1.get(key) 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 - Searchview doesn't work since app compat

Since I implented app compat my searchview doesn't work anymore: Process: com.laurenswuyts.witpa, PID: 26666 java. ... app compat 21. Regards, 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 - Eclipse Editor: How to change file format from Dos to Unix

I am using eclipse editor to work on my remote files it appears that eclipse editor is set to dos file format ... set file format in VIM 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 - Is "new String()" immutable as well?

I've been studying Java String for a while. The following questions are based on the below posts Java String ... could someone share the link? 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 - Lists.newArrayList vs new ArrayList

What is the best construction for creating a List of Strings? Is it Lists.newArrayList() (from guava) or new ... in using Lists.newArrayList()? 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 the correct way to write to temp file during unit tests with Maven?

I have written a unit test that writes a file to the file-system, given no path it writes to the working ... something that's easy to find. 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 generate the same UUID from a String

I am wondering if there is a way to generate the same UUID based on a String. I tried with UUID, it looks like it does not provide this feature. 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 - Thymeleaf: Concatenation - Could not parse as expression

I'm having an issue when trying to concat multiple values in my template. According to Thymeleaf here I should simply ... } return context; } } 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 speed up the scroll speed in a JScrollPane when using the mouse wheel?

I see the method JScrollPane.setWheelScrollingEnabled(boolean) to enable or disable the mouse wheel scrolling. Is there ... that. Any ideas? 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 - Any idea why I need to cast an integer literal to (int) here?

In the following example int i = -128; Integer i2 = (Integer) i; // compiles Integer i3 = ( ... confusion between unary and binary operators. 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 - Extract columns of text from a pdf file using iText

I need to extract text from pdf files using iText. The problem is: some pdf files contain 2 columns and when I ... please help me with the task? 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 C2DM Push Notification

I am developing one application and in that application I need to implement push notifications. Can anyone suggest ... would be great! 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 implement WebDriver PageObject methods that can return different PageObjects

I've just started using WebDriver, and I'm trying to learn the best practices, in particular using ... permutation of data/PageObjects? See Question&Answers more detail:os...

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

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