java

问题 I'm just refactoring some of my old projects to use features of Java 8. int counter = 1; for (Checker checker : checkers) { if (counter < checkers.size()) { checker.setNextChecker(checkers.get(counter++)); } } Here's kinda Chain of Resp pattern. And I need to set next checker for every checker in the list, excluding the last one. Still can't find the way to use Stream API here :) 回答1: Using IntStream.range : IntStream.range(1, checkers.size()) .forEach(i -> checkers.get(i-1).setNextChecker

问题 I am trying to extract the ids from each company_id from the following Json String String test = ["{\"company_id\":4100,\"data\":{\"drm_user_id\":572901936637129135,\"direct_status_id\":0,\"direct_optin_date\":0,\"direct_first_optin_date\":0,\"direct_last_optin_date\":0,\"direct_optout_date\":0,\"direct_last_form_date\":0,\"direct_last_form_id\":0,\"direct_last_promo_id\":0,\"anon_status_id\":600,\"anon_optin_date\":1446132360498,\"anon_first_optin_date\":1446132360498,\"anon_last_optin_date\

问题 From within Java unit tests, I want to use Selenium to test my web page with Firefox. My tests require that I set an environment variable for Firefox. (Specifically, I want to set the DISPLAY variable.) The FirefoxBinary class has a method setEnvironmentProperty, which sounds like it should set environment variables for the environment the Firefox process runs in, but in practice it does not have that effect. (I have confirmed that with cat /proc/<firefox_pid>/environ .) Back with selenium

问题 How to use optimistic locking with batch updates? I am using SimpleJdbcTemplate and for a single row I can build update sql that increments version column value and includes version in WHERE clause. Unfortunately the result int[] updated = simpleJdbcTemplate.batchUpdate does not contain rowcounts when using oracle driver. All elements are -2 indicating unknown rowcount. Is there some other, more performant way of doing this than executing all updates individually? These batches contain an

问题 Web Service - Tomcat deployed in LINUX Below is my code that sends HTTP request i read that TOO MANY OPEN FILES causes because of client does not close the stream and leave it open then I tried close my stream in below codes And increased ulimit -n number to 4096, still got this error if ("GET".equals(methodType)) { //req System.setProperty("http.keepAlive", "false"); logger.info("<--------CALLING TAX-CLIENT REQUEST------------>"); URL url = new URL(api_url + "?" + queryParams); // URLEncoder

问题 This question already has answers here : Calculating the difference between two Java date instances (44 answers) How to find the duration of difference between two dates in java? (16 answers) Java method to find difference between 2 date objects in years, months and days (7 answers) Closed 1 year ago . Suppose I have : Employee model which has startDate as its property variable and Promotion model has promotionDate . I want to find out for how long employee has worked until his promotion for

问题 This question already has answers here : Calculating the difference between two Java date instances (44 answers) How to find the duration of difference between two dates in java? (16 answers) Java method to find difference between 2 date objects in years, months and days (7 answers) Closed 1 year ago . Suppose I have : Employee model which has startDate as its property variable and Promotion model has promotionDate . I want to find out for how long employee has worked until his promotion for

问题 let's say, i have a class public class A{ private UUID typeId; private B data; } public abstract class B{ private String a; } public class BChildOne extends B{ ... some variables } public class BChildTwo extends B{ ... some variables } type of class B is changing, according to A's typeId , so if typeId of A is "XXX", type of data field is BChildOne, and if typeId of A is "YYY", type of data field is BChildTwo. how can i achive that? so for i tried that; @JsonAutoDetect(fieldVisibility =

问题 I was instructed not to use a storage array to complete this task. Basically, we have to create a function that rotates the contents of a 2d array 90 degrees. So if I start off with this array: int[][] array = {{1,2,3}, {4,5,6}, {7,8,9}}; The function should return an array like this: {{7,4,1}, {8,5,2}, {9,6,3}} Again we are not allowed to use a created array within the function for storage. Is it even possible to accomplish this without a storage array? 回答1: You can rotate/transpose the

问题 i am using netbeans to use vlcj jar my jdk is jdk-7u45-windows-x64 and my vlc is 64b i installed the library by going to libraries then right Click on the libraries file then add jar/folder and i added the file i download it from here file link the file name vlcj-3.0.0-dist.zip i unzip it then add it by select them all the code for test is this package translater; import uk.co.caprica.vlcj.binding.LibVlc; import uk.co.caprica.vlcj.runtime.RuntimeUtil; import com.sun.jna.Native; /** * *