java
Question: How to find out the JVM manufacturer? As I understand it, there are several JVM vendors: Oracle (Oracle Hotspot), Free Software Community (OpenJDK), IBM (IBM J9), Azul Systems (Zing) and others. How (from the jdk package) can you find out which version of the JVM is being used? Answer: …
Question: I'm fairly new to Java and even more recent to Android development. Confused for one moment How to set arguments with a default value in a method? It is not very pleasant to produce a ton of overloads for all occasions. Answer: There is no such possibility. To achieve …
Question: I'm learning Java and doing a simple introductory OOP exercise. It gives me an error but I am not able to understand where I am failing, I use Netbeans as IDE. Here the class code: public class Empleado { // Decimos qué atributos tendrá nuestra clase private String nombre; …
I don't understand what I failed in this introductory exercise to OOP in Java Read More »
Question: It is necessary to implement a pattern builder for a tree-like data structure. Everything I've tried shows that this is very difficult to do and extremely inconvenient and much easier to do after a few new. I would be very happy if someone solved similar problems and showed an …
Question: I'm a little lost here, I would like to put a parameter in the view to inform the user that their password is wrong, expired etc. the problem that spring-security identifies. WebSecurityConfigurerAdapter @Configuration @EnableWebSecurity @EnableGlobalMethodSecurity(prePostEnabled = true) public class SecurityConfiguration extends WebSecurityConfigurerAdapter { @Autowired private UserDetailsRepository userDetailsRepository; @Override protected …
Question: Problem: When I create a JAR through eclipse it works fine, but I'm trying to take advantage of the JAR that Maven is creating and I realized that it doesn't run, because my main class is not in Manifest . Use this configuration in POM.XML to tell my Main …
Question: Let's say I receive the following content that is stored in a String: { “client_id”: 1580, “videos”: 4, “remote_urls”: [{ “url”: “rtsp://aniceurl.com” }, { “url”: “rtsp://aniceurl.com” }, { “url”: “rtsp://aniceurl.com” }, { “url”: “rtsp://aniceurl.com” } ], “action”: “start” } I recognize the JSON and all, but it's saved in …
Question: How to wrap the whole class in throws ? I just have a lot of methods in the class and in each I do try catch , the code becomes healthy and not readable. Is there any way to make the try catch only be where I create the …
Question: In my example I have two classes that are SetorInteresse and Vaga , below is the structure of the two: Class SectorInterest: public class SetorInteresse { private List<String> setores; public SetorInteresse(List<String> setores) { this.setores = setores; } public SetorInteresse() { } public void addPalavra(String palavra) { setores.add(palavra); } public …
Question: We have an internal project in the company where we study in our free time from the main projects. The project is a messenger with a video calling function. We take video communication and messaging (the ability to create and communicate in common channels) from a third-party SDK. The …
java – Online/offline status of users in real time Read More »
