Questions tagged as 'java'

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problems in compilation jfreechart and netbeans

I have a program made by using RXTX library (or jSerialComm, I'm not sure because it seems that it takes any of the 2 same code) the data sent by arduino sensors. Then I graph them using the JFreeChart library. Everything works like a charm whil...
asked by 07.06.2018 / 17:29
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What does this JasperReport error mean?

I am creating a project in which I generate a report and I would like to print it, I am using iReport and JasperReport. The code to send it to print is as follows: try { JasperReport jasperReport=(JasperReport)JRLoader.loadObjec...
asked by 07.06.2018 / 17:31
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Drag and Drop in JAVA

I am doing some tests, drag and drop, so far I have been able to upload the files, but I want to restrict them so that they are only XML so far this is my DataTarget. DropTarget target = new DropTarget (tablaXml, new DropTargetListener...
asked by 08.06.2018 / 16:48
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Copy selected audio file to a folder on android

I am learning how to program app for android, I am a bit stuck and I can not find information about it. My intention is for the user to select an audio file through: Intent.ACTION_GET_CONTENT, MediaStore.Audio.Media.EXTERNAL_CONTENT_URI)...
asked by 08.06.2018 / 17:34
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Problem with setText () in java

Hello, I am trying to change the text of a JTextArea from another class, for that create a method that takes care of it, the problem is that when I create the object of the class where the field of type JTextArea is and I try to change it the te...
asked by 06.06.2018 / 23:56
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Insert data from a JTextField to MySQL

I would like to be able to help me with links, information, etc. that will help me to recover this: I have a jtxtField that I want to enter the information of is to the database in MYSQL and I really do not know how to do it. I have the connecti...
asked by 11.06.2018 / 21:07
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Java - How to traverse a file.txt and order it?

Good day to all and thanks for answering. I am doing a program in which a file.txt is handled, it is a phone book that stores the name surnames and the telephone number of the person, however I have no idea how to make said agenda alphabetically...
asked by 06.06.2018 / 07:46
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Practicing, making a window with a button

I'm a newbie in Java and my first code, is to make a JFrame modal window that you can modify the background and have a button, but I do not get it, I do not know why: package practica1; import javax.swing.*; import java.awt.Color; public clas...
asked by 16.06.2018 / 23:23
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How to adjust the content of a jtextarea?

As I can adjust the content of a jtextarea for example, I have this line inserted in the JTextArea: jTextArea1.append("\n----------------------------------------------------------------------------------------------"); With this method I pr...
asked by 16.06.2018 / 22:06
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error when inserting a double value in a database

I try to make an insert of a double value into a database (MySQL) and it shows me the error: java.sql.SQLException: '∞' is not valid numeric or approximate numeric value Connection conexion = AdminConexion.getInstancia().obtenerConexion();...
asked by 17.06.2018 / 01:34