Questions tagged as 'java'

Tagged questions
1
answer

generate excel in java and download it from jsp

What I'm grabbing is generating an Excel file in java from a query in sql the file is generated by clicking on a generate report button that I made in jsp and the idea is that when the Excel is generated I get the option of downloading that file...
asked by 09.02.2017 / 19:41
1
answer

Save a database on the sd card

How can I save my database in the sd of my cell phone? Here I have it created: public class DB extends SQLiteOpenHelper{ String tabla ="CREATE TABLE Datos (Id INTEGER PRIMARY KEY AUTOINCREMENT, N text, C text, R1 INTEGER, R2 INTEGER, R3 INTEG...
asked by 10.03.2017 / 04:26
1
answer

How can I convert .doc or .docx files to .txt in Java? [closed]

Hello, I need to convert doc or doxc files to txt but I have no idea how it is done I searched how to convert them but I have not found anything.     
asked by 14.03.2018 / 05:58
2
answers

Problem does not take me a local variable when I call a class

I have a problem, create a class that has a counter and a boolean array, if the position is even and true , add 1; and if it is odd and false also sum. I declared an array and initialized it as 0, that is, {} , then in the...
asked by 21.03.2018 / 17:14
1
answer

Go from String to Float (Read well) [closed]

Good friends, I need to pass a string string to float in JAVA . The problem is that in the end, each string ends with units (volt,%, cm, m .. etc) example: Convert the String "0.22V" to float : 0.22 Thank you very much! PS: All the...
asked by 13.08.2017 / 16:53
1
answer

Open Apk with another Apk [duplicated]

I am working with Android / ios Applications. I would like to know if it is possible to run an application B using an Application A, with a button     
asked by 11.12.2018 / 14:06
1
answer

Errors in Java add and get

Good evening, I've run into two errors that I do not know how to solve, I've tried everything I know and asked friends, but not even with those. The code is this: public int getButacasDisponiblesSesion (int sesion){ return this.sesiones.get...
asked by 20.04.2017 / 23:08
1
answer

How to show the string of the selected item in a JComboBox stored from a MySQL table

I have the following problem, when selecting a row of my JTable to modify its data, I call a form whose data of the table is filled in the fields of the same, inside the form there is a JCombobox that is filled with the stored data of the table...
asked by 07.05.2017 / 18:22
1
answer

How to pass data that a servlet gets from a BD to an HTML page? no JSP

This is more a doubt of something that could be feasible to carry out. What I want to do in itself, is that from a servlet I communicate with mysql to get the results of a table, and I want to pass that data to a table on an html page, I know...
asked by 26.04.2017 / 03:44
1
answer

Error: java.lang.arrayindexoutofboundsexception: 15

In my program marks this error and I do not know where the problem is. What I try to do is generate 45 numbers of an integer and a decimal, save them in 3 arrays of 15 elements each and generate another arrangement of only 3 elements where...
asked by 26.07.2018 / 19:45