包含标签：Java 的文章
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Java – if it is not null, put the value into the map
Does java have anything similar? map.putIfValueNotNull(key,value) Therefore, I can put the value in the map only if it…… -
Java – a simpler way to reverse the comparator created inline by static methods (functional interfaces)?
Since the comparator < T > is a functional interface, I can do this Comparator<Instant> instantComparator …… -
Java – which EJB 3 persistent provider should I use?
I use EJB 3 on a fairly large J2EE project. By default, NetBeans sets the persistence provider of entity beans to TopL…… -
Java – logback roll only for file size
I'm using logback 1.0 13. I want my log files to scroll completely based on file size If it takes two hours or two yea…… -
Java – interpretation of V – > V > 5
I have a given function call, and Java gives me an error because the object cannot be compared with int (of course...)…… -
Java – JUnit asserts double arrays
How do I assert that two double arrays contain the same elements There are some ways to assert that integer arrays and…… -
java – Log. D log is not displayed in logcat Android studio d
Android studio does not display any logs I wrote in the code I have tried to set the log to verbose and debug I'm usin…… -
Java – override methods and then face problems
When the overlay method then faces a problem: public interface IProduct { public void sendMessage(Object object); …… -
Java – null check using Date object [copy]
See English answers > java object null check for method 8 Solution Check if it is empty: if (date == null) {...} Ch…… -
Java – spring H2 embedded database
See the English answer > does spring embedded database support different SQL conversations? 3 MODE=MysqL DB_CLOSE_O…… -
Java – activator 1.3 0 error on SBT project?
I'm happily working on some SBT projects. After I download and use the new version of typesafe activator, I can't open…… -
Java generics: return bounded generic types
I follow this Code: public <T extends ParentException> T managedException(Exception cause) { if(Exce…… -
Java – understanding TreeSet returns 0 during comparison
I created a student class like this: public class Student implements Comparable<Student> { private String f…… -
Leiningen: create an executable jar to run without Java – jar
I tried to understand how to package a command - line application written in clojure for distribution I don't want use…… -
How to copy files in Java through bufferedinputstream and bufferedoutputstream?
I want to use bufferedinputstream and bufferedoutputstream to copy large binaries from the source file to the target f…… -
Java date difference days
See English answers > Android / Java – date difference in days 18 Date nextCollectionDate = dispenseNormal.getDispe…… -
JavaFX button with multiple text lines
I need to create a toolbar on the screen. It has multiple buttons. Each button must have multiple lines of text For ex…… -
Is there any way to use the onresourcerequested callback of phantomjs in the Java driver?
I want to avoid loading CSS files in phantom JS I'm using a Java driver page.onResourceRequested = function(requestDat…… -
Java – why does the dropwizard configuration not work?
Recently, I changed the dropwizard version of HVDF project from 0.6 2 to 0.8 2. Once I try to run the application, I g…… -
Can generic types be extended to multiple classes in Java?
I'm trying to write a method using generic parameters in Java. I want to limit it to one of three possible classes (fi…… -
Java – update multiple volatile and j.u.c.atomic variables atomically
In order to update two or more volatile variables atomically, do you need to protect them through lock with synchroniz…… -
java. security. Invalidalgorithmparameterexception: the parameter object is not ecparameterspec
We use WL 11g and jdk1.0 on Linux machines 7 update 121 We see the following error to another Weblogic machine during …… -
Does Java – PostgreSQL support rest API?
I wonder if PostgreSQL supports rest, or are there other ways to implement it? Solution Postgres does not support out …… -
Java – when do I create a getter method without “get” in its name?
The following questions have bothered me for a long time. I can't find any information about naming conventions There …… -
Java – how to use custom validation in Jersey
I want to implement verification in Jersey, so if I send a duplicate value of username or email that already exists in…… -
Update specific object items in array list Java
I want to ask a question, how do I update the records in the array list object: For example: List<User> userList…… -
Java – is there a functional difference between initializing singletons in the getInstance () method or instance variable definition
Are there any functional differences between the two methods of implementing singleton? public class MySingleton { …… -
Read stream from S3 using clojure / Java
I have a large file on S3. I hope to decode and parse it when downloading I happen to use clojure Amazon library, but …… -
Java – cannot convert an empty string value to an enumeration
I am looking for a convenient solution to filter out fields pointing to empty string values before / during deserializ…… -
Java – inheritance and ‘instanceof’ test results
I'm studying 'instanceof' Java, but I can't clearly understand 'instanceof'. I think the following answers are true an…… -
Java – Android textview text is truncated at the bottom
So I have two text views, one above the other, but when the second text view is filled, the cut is truncated at the bo…… -
Java – how to restrict method calls to specific methods
I have a special requirement. I need to ensure that only specific methods in one class are allowed to call public (non……