java-8

问题 I'm building an android chat app using rabbitmq and the project builds without any issue. However, I'm having an issue in creating ConnectionFactory object. It gives me the following error E/AndroidRuntime: FATAL EXCEPTION: main Process: com.zabu.kyimoecho.mosaic, PID: 9002 java.lang.NoClassDefFoundError: com.rabbitmq.client.impl.nio.-$$Lambda$NioParams$NrSUEb8m8wLfH2ztzTBNKyBN8fA at com.rabbitmq.client.impl.nio.NioParams.<clinit>(NioParams.java:37) at com.rabbitmq.client.ConnectionFactory.

问题 I has db in MS SQL Server 2005 I has java project write on java 8 . My project is on Windows 7 Professional's machine (64 bit) . I use this jar: sqljdbc4.jar to connect to MS SQL Server 2005 . But when I start my app I get error: [java] log4j: setFile ended [java] log4j: Appender [File] to be rolled at midnight. [java] log4j: Adding appender named [File] to category [root]. [java] [25.05.2019 15:11:44.979] com.myproject.common.LNFSetter.setLNF(LNFSetter.java:60) TRACE: [java] lookAndFeelName

问题 I has db in MS SQL Server 2005 I has java project write on java 8 . My project is on Windows 7 Professional's machine (64 bit) . I use this jar: sqljdbc4.jar to connect to MS SQL Server 2005 . But when I start my app I get error: [java] log4j: setFile ended [java] log4j: Appender [File] to be rolled at midnight. [java] log4j: Adding appender named [File] to category [root]. [java] [25.05.2019 15:11:44.979] com.myproject.common.LNFSetter.setLNF(LNFSetter.java:60) TRACE: [java] lookAndFeelName

问题 I am looking for a distributed semaphore implementation (with postgres / zookeeper as store) that is similar to the concept of java.util.concurrent.Semaphore which will maintain a set of permits that will be taken using acquire() and released with release() allowing me to restrict access to some resource or synchronize some execution. The only difference is that this semaphore should allow me to do all these actions across multiple jvms. Can someone point to me if there is any such

问题 I have a code which is suppose to group a list of transaction objects into 2 categories; public class Transaction { public String type; public Integer amount; } The following function divided the list into 2 categories by checking a condition. The output map of the stream operation is Map<Boolean, List<Transaction>> , but I would like to use a String as its key. So I converted them manually. public static Map<String, List<Transaction>> partitionTransactionArray(List<Transaction> t1) { Map

问题 I have a date in utc second and its time zone offset in sec. I would like to convert it to date string in format yyyy-mm-dd using java8 ZoneOffset class. Below is the time in seconds and offset long time = 1574962442, long offset = 3600 Now i want to obtain date in below format using java-8 DateTime API ? String date = 2019-11-28 // in yyyy-MM-dd 回答1: You can use Instant from java-8 DateTime API to obtains an OffsetDateTime of Instant from epoch seconds with offset seconds OffsetDateTime

问题 Closed. This question needs debugging details. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . Improve this question class DataObject { String attr1; String attr2; String attr3; // getters of three fields(getAttr1(),getAttr2() and getAttr3()) // setters of three fields(setAttr1(),setAttr2() and setAttr3()) } List<DataObject> result = null;//Output List of objects of 'DataObject' class List

问题 Closed. This question needs debugging details. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . Improve this question class DataObject { String attr1; String attr2; String attr3; // getters of three fields(getAttr1(),getAttr2() and getAttr3()) // setters of three fields(setAttr1(),setAttr2() and setAttr3()) } List<DataObject> result = null;//Output List of objects of 'DataObject' class List

问题 I am grouping and partioning a stream as follows: // Partioning Map<Boolean, List<Person>> partitioned = persons.stream(). collect(Collectors.partitioningBy(p -> p.getAge() > 20)); // Grouping Map<String, List<Person>> grouped = persons.stream() .collect(Collectors.groupingBy(p -> p.getCity())); Is there a way i can combine both of these? I tried combining both with using groupingBy inside partioningBy, but did not get the things right. Any suggestion? The expected result is the partition the

问题 I am trying to perform some transformation on the list of CompletableFuture tasks, but facing some issue because of lack of experience. I have a list of CompletableFuture but I am failing to perform further transformation on it. import java.util.*; import java.util.concurrent.CompletableFuture; import java.util.concurrent.ExecutionException; public class thenapply { public static void main(String[] args) throws InterruptedException, ExecutionException { List<Integer> list = Arrays.asList(5, 9