Recent questions tagged Java

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java - Checking for write access in a directory before creating files inside it

My small utility application asks the user for an output directory via a GUI file selector. Then it creates a lot of ... ? I am using Java 5. 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 Method.isBridge used for?

During navigation of the java.lang.reflect.Method class I came across the method isBridge. Its Javadoc says that it ... as a bridge if required? 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 enum in switch case

I am trying to check what values are set in my VO. Below are my clasess. I am getting "The qualified case ... constant DOCTORS" break; } } } 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 - @After ,@before not working in testcase

I have started testing and now i want to use @After, @Before and @Test but my application only runs ... and @before working simultaneously? 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 - Comparing two Calendar objects

I want to compare two Calendar objects to see if they both contain the same date. I don't care about any value ... c1 and c2 field by field? 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 - Create spring repository without entity

I want to use spring data repository interface to execute native queries - I think this way is the ... spring repository without entity? 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 - exception.getMessage() output with class name

I'm trying to fix an issue, in my application I have this code try { object1.method1(); } catch(Exception ex) { ... : "+ex.getMessage()); } } 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 get a first element from a sorted list?

I used Collections.sort(playersList); to sort a List. So, I think playersList is sorted now. But how can I ... ? playersList[0] does not 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 - Failing to run jar file from command line: “no main manifest attribute”

I am trying to run a jar file from the console: java -jar ScrumTimeCaptureMaintenence.jar And am getting the ... file from the command line? 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 make my class iterable so I can use foreach syntax?

I have Book and BookList classes. BookList is something like this: public class BookList { private final List<Book> ... can I get this working? 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 find main class :bootRepackage

I got a problem with my gradle build. I use the standard proposed by the Spring Website (https://spring.io/ ... at school) it work perfectly. 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 add an int (minutes) to LocalDateTime.now()?

I want to modify LocalDateTime.now() by adding a certain amount of minutes to it. How do 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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555 views

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java - How can you make a created_at column generate the creation date-time automatically like an ID automatically gets created?

I currently have an Entity as below: @Entity public class Product { @Id @GeneratedValue(strategy = GenerationType.AUTO) ... Product created"); } 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 - Add a new file in Intellij doesn't add to subversion

I'm not sure what I did to cause this, but adding a new file or package in IntelliJ now doesn't add ... a setting that controls this behaviour? 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 compare Boolean?

Take this for example (excerpt from Java regex checker not working): while(!checker) { matcher = pattern. ... be dealt differently than boolean? See Question&Answers more detail:os...

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

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312 views

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java - Formatting using printf and format

In the following program class ZiggyTest2 { public static void main(String[] args){ double x = 123.456; char c = ... ) { //do something } 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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331 views

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java - Why does EnumSet have many overloaded "of" methods?

While going through the EnumSet<E> of method, I have seen multiple overloaded implementations of of method: ... find any convincing explanation. See Question&Answers more detail:os...

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

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242 views

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java - RestTemplate uriVariables not expanded

I try to access a rest endpoint by using springs RestTemplate.getForObject() but my uri variables are not expanded, ... 3.1.4.RELEASE 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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358 views

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java - Jackson: Deserialize to a Map<String, Object> with correct type for each value

I have a class that looks like the following public class MyClass { private String val1; private String val2; private Map ... ) .build(); } } 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 it possible to tell the compiler that a method always throws an Exception

Generally speaking, the Java compiler does not propagate the information that a method "always" throw an Exception, ... a method always throws. See Question&Answers more detail:os...

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

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379 views

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java - Kotlin - generate toString() for a non-data class

Situation: I have a class with lateinit fields, so they are not present in the constructor: class ConfirmRequest( ... to implement it in Kotlin? 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 - "where exists" in Hibernate HQL

How can I write a "not exists" query in HQL? I am trying to get an HQL not exists query which returns the ... what I'm doing wrong? 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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592 views

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java - Android Studio Logcat not showing logs

There is very awkward thing I am facing. Logcat is shown in debugging application, but while running (not ... it but nothing is happening. See Question&Answers more detail:os...

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

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784 views

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java - Why do I get "object is not an instance of declaring class" when invoking a method using reflection?

public class Shared { public static void main(String arg[]) throws SecurityException, NoSuchMethodException, ... Shared.java:20) 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 Math.round return a long but Math.floor return a double?

Why the inconsistency? 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 a classpath resource to an array of byte?

I know how to get the inputstream for a given classpath resource, read from the inputstream until i ... (myInputStream) for example! See Question&Answers more detail:os...

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

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269 views

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java - Calling default method in interface when having conflict with private method

Consider below class hierarchy. class ClassA { private void hello() { System.out.println("Hello from A"); } } ... at compile time. Any clues ? 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 - Mockito cannot mock this class

I am attempting to mock a public class, however when doing so, Mockito throws an Mockito cannot mock this class ... finished with exit code 255 See Question&Answers more detail:os...

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

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