Questions tagged as 'java'

Tagged questions
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How to get data from a list only when there are two equal codes

Currently I can only get the different data from two lists, for example: Lista X Código 1 Código 2 Lista z: Código 1 Código 3 I can only get the code 2 and 3 . Now the need arises to get the same data, following the above exam...
asked by 23.06.2015 / 21:24
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Why is this ResultSet returning null?

If I run a query in the database returns result, however, when I run the code in java, assigning the result to a ResultSet, it appears to be empty. Can you help me? PreparedStatement ps = conectar.con.prepareStatement("select colaborador.codig...
asked by 12.07.2015 / 19:17
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Java: Understand wait () function notify () notifyAll ()

I am studying Threads Java and its features and I came across a question. I have the following classes in my program: public class Main { public static void main(String[] args) { ThreadB b = new ThreadB(); b.start();...
asked by 29.12.2015 / 19:28
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How to format date in full?

Is there any class in java that works with long date formatting? For example: Entry: [dd / mm / yyyy] 2/27/2016 Check out: Twenty-seven of February 2016 I tried: import java.util.Calendar; import java.util.GregorianCalendar; impo...
asked by 27.02.2016 / 12:09
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GenericDAO - Is that correct?

I'm implementing a simple GenericDAO as below, but I feel like I'm doing something wrong, it works but I feel like there's something wrong anyway, could you help me? I created an interface like this: public interface GenericDAO<T,...
asked by 05.01.2015 / 15:57
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Tomcat 7 configuration in Eclipse results in HTTP Status 404

I downloaded the tar-gz version of TomCat 7 and in linux manually set the variable CATALINA_HOME I typed the command $CATALINA_HOME/bin/startup.sh and hit http://localhost:8080/ , it worked normally ( appeared home I've bee...
asked by 05.01.2015 / 00:02
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How does authentication work in a RESTFul stateless environment?

My question is: Imagine 3 tomcat servers (s1, s2, s3) and all 3 servers connect to a single sgbd server (s_bd1). The three tomcat servers run an application that is RESTFul and stateless in nature, so they do not load the user session. her...
asked by 19.09.2014 / 03:45
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Difference between null and clear in an ArrayList

What's the difference between: arrayList.clear(); and arrayList = null; Do not both destroy all elements of the ArrayList?     
asked by 29.08.2014 / 05:39
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Problems with thread

public class ThreadTest implements Runnable { private String word; private long time; public ThreadTest(String word,long time){ this.word = word; this.time = time; } public void run() { try { for(int x = 1; x <= 15; x++)...
asked by 31.05.2014 / 19:44
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Differences between Log4J and SLF4J

What are the vantagens and desvantagens of each? Can they be usados simultaneamente in the same project?     
asked by 23.04.2014 / 17:50