Questions tagged as 'java'

Tagged questions
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Does anyone know of a library that calculates integral and derived in java

I would like to know if anyone knows a library that calculates integral and derived in java.     
asked by 16.03.2015 / 13:23
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Modification of variables passed by parameters

Is it possible to change a button passed by a parameter? I have a main class and a secondary ... In the main class I instantiate one of the secondary one by passing a string and a button. Secundaria s = new Secundaria (String s, Botao B)...
asked by 18.03.2015 / 18:26
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Code in java causes persistence problem

After adding the following lines to my class MetaDicas.java, a persistence problem appeared that there was not before: Added lines: @OneToMany(cascade=CascadeType.ALL) @JoinColumn private List<Integer> notas; Error: >javax.per...
asked by 16.03.2015 / 17:24
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Problems loading dataTable PrimeFaces

I am using in the Java Web application CDI, JPA and Maven, my application is already inserting records into the database without any problem, now what I have left is to list the records in the PrimeFaces dataTable. Since I am a programmer wit...
asked by 30.03.2015 / 15:22
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How to get current month with getDisplayName

I want to get the current month and for this I am using the following code: Calendar calendar = Calendar.getInstance(); String mes = calendar.getDisplayName(Calendar.MONTH, Calendar.LONG, Locale.ENGLISH); The problem is that for example now...
asked by 04.04.2015 / 23:47
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What is the best way for an Activity to call itself?

The app displays random questions following as a template with QuestionsActivity , ie the user chooses true or false and will only change the question ( textView ) and the screen design will remain the same. My questions are in As...
asked by 04.04.2015 / 03:26
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Web service does not access my classes

I'm setting up a web service, previously it was already working normally but the scripts were all in one package, so I decided to organize my scripts in different packages Butnowmywebservicedoesnotaccessclassesthatareinadifferentpackagethanth...
asked by 03.07.2015 / 01:14
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How to get data from a Fragment and play in an Activity?

I have a class in java that takes all the information and builds the entire structure of my program. Well, how do I get an EditText that is in my fragment and throw its contents into the other activity. Example: My fragment calls a layout...
asked by 03.07.2015 / 22:12
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Change List View item color if it is disabled - Android

I have a normal listview that lists the names of my users. And I would like the disabled users to have the gray bottom of the list item. How to do this? public class Usuario { private String nome; private String endereco; private Boolean a...
asked by 04.07.2015 / 01:42
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Error connecting to MySQL database in Java

Connection code: package br.bent.jdbc; import java.sql.DriverManager; import java.sql.SQLException; import java.sql.Connection; public class Conexao { private static Conexao conexao; public static Conexao getInstance(){ if...
asked by 06.07.2015 / 05:13