Java
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Java forced volatile access
Consider such a situation There are two threads and a shared resource (such as HashMap) A thread creates a HashMap and…… -
Java – hibernate extra query after join fetch on the same entity
I try to query a large number of entities by using this query, although Hibernate: "Select * " + " From Dossie…… -
How to use multiple streams and in Java 8 with lambda expressions Map function
I have a list County, which only contains the unique county name, and a list txcrarray, which contains the city name, …… -
Java – how do I use group mapping streams?
I have a long child // ordered by parent.id / child.id Stream<Child> childStream; Say, Child(id = 1,parent(id = …… -
Pass checkstyle to Java Hello World
So I'm a novice using checkstyle. For my simple HelloWorld Java program, I received a lot of errors that I don't under…… -
Java – specifies the specific enumeration passed to the method in the mockito doreturn method
I have a JUnit test. I have an object simulated in a class Let's call the mocker class with @ mock of mymanager named …… -
Find the maximum product of negative numbers in Java
I'm taking a semi - advanced course in Java I taught myself JavaScript as a hobby, so I'm not a real beginner, but I'm…… -
Java – getters for display
I'm studying getters / incubators. The general idea is that they are evil and should be avoided You should let the obj…… -
java. Lang.unsupported operationexception: cannot resolve property at index 13: typedvalue {t = 0x2 / D = 0x7f010046 a = – 1}
I work for Android attrs XML file adds an attribute for different color shades In styles In the XML file, I give these…… -
java – /google-play-services_ lib/AndroidManifest. XML parser exception: premature end of file
I'm trying to import Google play services into eclipse_ Lib, as they said in this tutorial（ http://developer.android.…… -
What protocol does java socket use?
I started using the socket and socketserver classes in Java As mentioned above, I want to know which protocol (or what…… -
How do I change the old for loop to intstream?
This for loop traverses the int array It changes the value of (index - 1) to the value of the current index So the res…… -
Java – converts long to “byte array ed” text without heap allocation
I want to convert the (positive) original long into byte [] For example, a simple method is: 123 = > "123" = > […… -
Binary to decimal Java converter
I'm creating a code that allows you to convert binary numbers to decimal numbers and vice versa I've created a code to…… -
Kotlin – NoClassDefFoundError when using exposed
I use exposed as my database library. When I try to run my code, I encounter these errors: Exception in thread "main" …… -
Java – janusgraph outputs the subgraph as a graphson error
I tried to use janusgraph to output a sub graph in the gremlin shell as graphson Tinkerpop documentation for reference…… -
How to handle exceptions in Java 8 stream?
I have a method. I traverse the list and create the list In doing so, I call a method (createresult) to throw a custom…… -
Java – get the POI Workbook of InputStream for OM Apache
Is there any way to get the InputStream of Apache POI workbook? I need it to pipe to another OutputStream, but I can't…… -
Bean validation message with dynamic parameters
I started using bean validation, and I'm trying to build constraints My constraint is to verify CPF (personal file in …… -
Java – how do I check that the value is equal to at least one field in the list?
I have this method: for (String fieldName : fieldArray) { Query query = new Query(); query.addCriteria…… -
Convert an existing c# synchronous method to asynchronous using async / await?
Starting with the synchronous I / O binding method (shown below), how do I use async / await to make it asynchronous? …… -
Java – how do I update the sample to use the latest versions of Jetty (9.1.0. RC2) and Jersey (2.7)?
I've been trying to follow this example, but I'm not lucky At the suggestion of the following reviewers, I decided to …… -
Java – unexpected tags in kotlin (use; separate expressions on the same line)
I use kotlin in my android project, which is developed on Java. I use kotlin data classes in the service layer Now I w…… -
RX Java – how to explicitly unsubscribe observable after oncomplete
In the following code, how and where does unsubscribe explicitly unsubscribe observable after completing oncomplete? g…… -
I should put Java stream Is the map function used with the switch statement?
I want to stream objects to different objects according to type Stream<Animal> animals = Arrays.stream(Arrays.as…… -
Traditionally, where do you store Java Class file?
I have a Java SRC folder where I store my Java file Then I use terminal to compile them and finally get them in the sa…… -
What is the reason behind dynamic method parsing in statically typed languages like Java
I'm a little confused about Java's concepts of dynamic / static types and dynamic method parsing consider: public clas…… -
Java – use objects in your own constructors
Is it possible (or wise) to use an object in its own constructor? (sorry for the noob problem of improper production) …… -
Java – kotlin native is equivalent to system exit(-1)
In the following kotlin / JVM program, system Exit (- 1) stop program execution with error exit code: fun main(args: A…… -
Java – use volatile keyword with wrapper class
In Java concurrency classes, I recommend using the following code as counters in multithreaded applications private vo…… -
Java – JUnit test cases for custom methods
I'm studying my first job interview as a junior java developer, and now I'm trying to learn JUnit test cases This is a…… -
Summation equation in Java?
I want to know how to write this summation equation in Java But the trick is, I need the sum equal to the amount x= To……