With Java 8 it is so simple so it doesn’t even need separate method anymore: List<Integer> range = IntStream.rangeClosed(start, end) .boxed().collect(Collectors.toList()); And in Java 16 or later: List<Integer> range = IntStream.rangeClosed(start, end) .boxed().toList();
The commons/lang builders are great and I have been using them for years without noticeable performance overhead (with and without hibernate). But as Alain writes, the Guava way is even nicer: Here’s a sample Bean: public class Bean{ private String name; private int length; private List<Bean> children; } Here’s equals() and hashCode() implemented with Commons/Lang: … Read more
Have you tried this (using HttpClient version 4): String encoding = Base64.getEncoder().encodeToString((user + “:” + pwd).getBytes()); HttpPost httpPost = new HttpPost(“http://host:post/test/login”); httpPost.setHeader(HttpHeaders.AUTHORIZATION, “Basic ” + encoding); System.out.println(“executing request ” + httpPost.getRequestLine()); HttpResponse response = httpClient.execute(httpPost); HttpEntity entity = response.getEntity();
Here are two examples from my working project. Using EntityUtils and HttpEntity HttpResponse response = httpClient.execute(new HttpGet(URL)); HttpEntity entity = response.getEntity(); String responseString = EntityUtils.toString(entity, “UTF-8”); System.out.println(responseString); Using BasicResponseHandler HttpResponse response = httpClient.execute(new HttpGet(URL)); String responseString = new BasicResponseHandler().handleResponse(response); System.out.println(responseString);
In my opinion the better choice is Guava (formerly known as Google collections): it’s more modern (has generics) it absolutely follows the Collections API requirements it’s actively maintained CacheBuilder and it’s predecessor MapMaker are just plain awesome Apache Commons Collections is a good library as well, but it has long failed to provide a generics-enabled … Read more
Using the official java email package is the easiest: public static boolean isValidEmailAddress(String email) { boolean result = true; try { InternetAddress emailAddr = new InternetAddress(email); emailAddr.validate(); } catch (AddressException ex) { result = false; } return result; }
Fun fact: The original snippet posted here was the most copied Java snippet of all time on Stack Overflow, and it was flawed. It was fixed, but it got messy. Full story in this article: The most copied Stack Overflow snippet of all time is flawed! Source: Formatting byte size to human readable format | … Read more