Questions tagged as 'java'

Tagged questions
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Error: can not cast

I am implementing the Navigation Drawer in my application. Only I get an error when I click on any of my items. Here the code: public class MainActivityMenu extends AppCompatActivity { private String[] mNavigationDrawerItemTitles; private D...
asked by 25.07.2017 / 18:14
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Calling a JComboBox from a JFrame from a class

I am working on a desktop application. The functional is realized in a class of a specific package. My code is as follows public void cargarComboCurso() { String url = "jdbc:sqlserver://localhost:1433;databaseName=Escuela";...
asked by 05.09.2017 / 23:36
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Generation of column in Excel with java without losing format (poi)

I've been looking for a way to generate an excel from java with the correct format for a couple of days. I have to make a table with their column names and above the name of the columns should put a title. The problem is that if a title is added...
asked by 06.09.2017 / 07:31
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How to open the file browser in an Android app?

Greetings I have an android application to download files, the problem is that I need to download the file there will be the system's default file browser in the folder where my file is downloaded so that the user can view your file. Th...
asked by 20.07.2017 / 15:14
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Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException in Java program

I am developing an application in Java Netbeans with phpMyAdmin database. I have already elaborated some more, but now this problem has occurred to me: This application is used to capture data from a warehouse that controls the entry and...
asked by 21.07.2017 / 01:19
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select count (*) from java executeQuery

How can I store the number that returns the select count (*) in a variable? public int contar_num_personajes() throws SQLException{ Connection dbConnection = null ; Statement stm = null; int n= 0; String co...
asked by 16.07.2017 / 21:22
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How to connect to MySQL from another PC?

I am new programming in java and I am learning how to use mySQL as well. I can already connect a database recorded on my PC, but I have a question as to how to connect to a database recorded on another computer. I am using Netbeans ..... as I...
asked by 15.07.2017 / 22:15
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Question Game Find Java Objects

I'm doing a hidden object game in java, where I have an interface with enough label (30 or more) that have an image, and the interface also has 5 buttons which have the names of 5 images of the interface, and with those names look for the image...
asked by 16.07.2017 / 02:21
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Create new logger in Wildfly 10 using log4j

I need to log certain modules in an app in a log different from server.log , initially I try to do it with a java project and its log4j2.xml file which works very well on another application server other than wildfly as weblogic. R...
asked by 01.08.2017 / 14:16
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Passing data from one JTable to the fields of another JFrame

How can I do to pass data from one JTable to another JFrame? For example: I have 3 JTextField and 2 JCombobox in a JFrame which are what I should fill in from JTable when pressing in a JFrame different. I...
asked by 23.07.2017 / 03:08