java-8

问题 I am trying to upgrade my project from Java 1.6 to Java 1.8, While doing Gradle build am getting JIBX binding compilation Error.If I run using Java 1.6 it works fine. I am using JIBX version 1.2.5, Gradle 2.9 version.JAVA 1.8.0_71, Groovy 2.4.4. Attachning my jibx.gradle below configurations { jibx } dependencies { jibx group: 'org.jibx', name: 'jibx-tools', version: '1.2.6' jibx group: 'org.jibx', name: 'jibx-bind', version: '1.2.6' jibx group :'org.jibx', name: 'jibx-extras', version:'1.2.6

问题 Is there a way to log cypher queries that get generated when we use spring jpa inbuilt queries like findById!? I have a complex inbuilt query whose cypher I need to see 回答1: Neo4j provides the ability to log all executed queries. Per https://neo4j.com/docs/operations-manual/current/monitoring/logging/query-logging: Neo4j can be configured to log queries executed in the database. Query logging must be enabled by setting the dbms.logs.query.enabled parameter to true. The parameter dbms.logs

问题 Is there a way to log cypher queries that get generated when we use spring jpa inbuilt queries like findById!? I have a complex inbuilt query whose cypher I need to see 回答1: Neo4j provides the ability to log all executed queries. Per https://neo4j.com/docs/operations-manual/current/monitoring/logging/query-logging: Neo4j can be configured to log queries executed in the database. Query logging must be enabled by setting the dbms.logs.query.enabled parameter to true. The parameter dbms.logs

问题 I currently have a class, public class Person { private String country; private String age; private String name; } Taking a List of this Person class as a argument, List<Person> I managed to group them in the following data structure using Java 8 group by (collection) function : Map<String, Map<String, Set<String>>> Example: USA={ 21= [ John, Peter. Andrew ], 22= [ Eric, Mark ] ] }, France = { etc.... Below is my function : public static Map<String, Map<String, Set<String>>> getNestedMap(List

问题 I want to check whether target time lies between two given times without considering date using Java8 time. Let say if starting time is "21:30" , ending time is "06:30" and target time is "03:00" , so program should return true. @Test public void posteNuit() { DateTimeFormatter format = DateTimeFormatter.ofPattern("HH:mm"); String s = "21:30"; String e = "06:30"; String t = "03:00"; LocalTime startTime = LocalTime.parse(s, format); LocalTime endTime = LocalTime.parse(e, format); LocalTime

问题 I am using Groovy/Java to create a little side project to track footballers stats. I have a method that iterates over a list of Player objects and finds who has scored the most goals and kept the most clean sheets. At the moment the methods use the same code, I am trying to make one generic method but can't see how to do this as each property I want to find the maximum of will be different eg goals and clean sheets. Can anyone give me some pointers, I am new to generics, I tried to pass in a

问题 I asked a question some time back about parsing CSV files for a single matching row. In the example shown below, I use a bufferedreader to read the header row as the first step. Using this row, I parse the column names and then proceed to search for matching rows. The filter criteria I need to search for the matching row should be based on 2 column values, instead the code shown below only returns the 1 row - presumably because I use .findFirst().get(); Instead I need something along the

问题 I am confused by the following code class LambdaTest { public static void main(String[] args) { Consumer<String> lambda1 = s -> {}; Function<String, String> lambda2 = s -> s; Consumer<String> lambda3 = LambdaTest::consume; // but s -> s doesn't work! Function<String, String> lambda4 = LambdaTest::consume; } static String consume(String s) { return s;} } I would have expected the assignment of lambda3 to fail as my consume method does not match the accept method in the Consumer Interface - the

问题 I am aggregating a bunch of enum values (different from the ordinal values) in a foreach loop. int output = 0; for (TestEnum testEnum: setOfEnums) { output |= testEnum.getValue(); } Is there a way to do this in streams API? If I use a lambda like this in a Stream<TestEnum> : setOfEnums.stream().forEach(testEnum -> (output |= testEnum.getValue()); I get a compile time error that says, 'variable used in lambda should be effectively final'. 回答1: Predicate represents a boolean valued function,

问题 Given this piece of code: public List<String> findPrices(String product){ List<CompletableFuture<String>> priceFutures = shops.stream() .map(shop -> CompletableFuture.supplyAsync( () -> shop.getPrice(product), executor)) .map(future -> future.thenApply(Quote::parse)) .map(future -> future.thenCompose(quote -> CompletableFuture.supplyAsync( () -> Discount.applyDiscount(quote), executor ))) .collect(toList()); return priceFutures.stream() .map(CompletableFuture::join) .collect(toList()); } This