java-8

问题 This question already has answers here : Lambda Expressions for Abstract Classes (3 answers) How to use TimerTask with lambdas? (5 answers) Closed 4 years ago . I want to perform a delayed operation on a map, so I am using Timer , to which I am passing a TimerTask and a delay in milliseconds: timer.schedule(new TimerTask() { public void run() { tournaments.remove(id); } }, delay); This is some sort of primitive cache-like functionality where I set an expiration time on a new resource that was

问题 This question already has answers here : Lambda Expressions for Abstract Classes (3 answers) How to use TimerTask with lambdas? (5 answers) Closed 4 years ago . I want to perform a delayed operation on a map, so I am using Timer , to which I am passing a TimerTask and a delay in milliseconds: timer.schedule(new TimerTask() { public void run() { tournaments.remove(id); } }, delay); This is some sort of primitive cache-like functionality where I set an expiration time on a new resource that was

问题 This question already has answers here : Lambda Expressions for Abstract Classes (3 answers) How to use TimerTask with lambdas? (5 answers) Closed 4 years ago . I want to perform a delayed operation on a map, so I am using Timer , to which I am passing a TimerTask and a delay in milliseconds: timer.schedule(new TimerTask() { public void run() { tournaments.remove(id); } }, delay); This is some sort of primitive cache-like functionality where I set an expiration time on a new resource that was

问题 I have a parent class Company which has a list of Employee objects. I need to create a stream of Parent class who has an Employee with the phone number mentioned. Company cmp1 = new Company(); cmp1.setName("oracle"); Company cmp2 = new Company(); cmp1.setName("Google"); Employee emp1 = new Employee(); emp1.setName("David"); emp1.setPhone("900"); Employee emp2 = new Employee(); emp2.setName("George"); emp2.setPhone("800"); Employee emp4 = new Employee(); emp4.setName("BOB"); emp4.setPhone("300

问题 I have a list of Items where each Item can belong to one or more category. For a limited set of categories(string) I want to create a map with category as key and list of Items as value. Assume my Item class is defined as shown below: public static class Item{ long id; List<String> belongsToCategories; public List<String> getBelongsToCategories() { return belongsToCategories; } public void setBelongsToCategories(List<String> belongsToCategories) { this.belongsToCategories =

问题 I'm learning Java 8 and more in detail the "CompletableFuture". Following this interesting tutorial: https://www.callicoder.com/java-8-completablefuture-tutorial/ I wrote the following Java class : package parallels; import java.util.ArrayList; import java.util.List; import java.util.concurrent.CompletableFuture; import java.util.concurrent.Executor; import java.util.concurrent.Executors; import java.util.stream.Collectors; import javax.ws.rs.client.ClientRequestFilter; import javax.ws.rs

问题 Java 8 environment. run tasks using CompletableFuture.allOf() concurrently and then get each result from each thread and then combine all results into one combinedResult and return it. In the below code, to get the result ( = List<Student> ) it doesn't have to be the code between I. and II. They say I need to use join() but didn't work I also got some allOf() from Java 8 CompletableFuture.allOf(...) with Collection or List and other links, but nothing works for me. I think I miss some very

问题 This question already has an answer here : Force 4-digit-year in localized strings generated from `DateTimeFormatter.ofLocalized…` in java.time (1 answer) Closed 2 years ago . I've been looking at the Date and Time library in Java 8 and was wondering if there is a way to format the date to the local format regardless of where the program is being run (as in, using the local format of the region the computer is set to). The Date and Time library uses the LocalDate class for getting a date.

问题 someone could help me, i'm starting from follow docker file FROM python:3.6-slim RUN apt-get update RUN apt-get install -y apt-utils build-essential gcc And i would add an openjdk 8 thanks 回答1: You can download java tar.gz, unpack it and set environment variable. Below a sample of implementation in Dockerfile: FROM python:3.6-slim RUN apt-get update RUN apt-get install -y apt-utils build-essential gcc ENV JAVA_FOLDER java-se-8u41-ri ENV JVM_ROOT /usr/lib/jvm ENV JAVA_PKG_NAME openjdk-8u41-b04

问题 I have one field and multiple values for it and I am trying to build a simple query which should look like this field:(value1 value2 value3) I have a map with fields and values and I am doing something like this fieldsMap "field1" -> "[data1]" "field2" -> "[value1,value2,value3]" Code to build lucene query: fieldsMap .entrySet() .forEach(field -> { try { QueryParser queryParser = new ComplexPhraseQueryParser(field.getKey(), new StandardAnalyzer()); booleanQueryBuilder.add(queryParser.parse