Questions tagged as 'java'

Tagged questions
3
answers

Capture the last character of a name

How to capture the last letter of a name (Juan Pedro) but I do not know how I could do it, I am new in this programming and I would appreciate if you could help me. String nombre="Juan Pedro"; int cantidad=nombre.length(); String nomMay...
asked by 01.05.2017 / 16:55
3
answers

How to create @repository in spring

why when a repository is created public interface BookRepository extends JpaRepository<Book,Long> { which means <Book,Long> , what is it for or what?     
asked by 01.05.2017 / 03:26
2
answers

Add or subtract the time difference between two dates in java

I need to add or subtract the time difference between dates, If the ESTADOLINEA is 1 add, and if the ESTADOLINEA is 2, subtract the time. This is the SQL table: My idea is to loop through the records This is my code:...
asked by 03.05.2017 / 09:54
1
answer

DataInputStream does not read full file

With this code I add new users to a binary file, list all existing ones and allows to search for one in particular and show all the data associated with it: case 1: System.out.println("Introduce nombre: "); nombre=teclado.next();...
asked by 07.05.2017 / 12:25
2
answers

Count times a value appears in an array

Given an array of n integers, count the number of times a value appears determined. Solve the problem with a recursive algorithm int contar (int [] array, int valor, int posInici) array : array with values. valor : v...
asked by 29.03.2017 / 16:01
1
answer

Variable step from js to java

I do not know how to catch a variable declared in javascript, from a java class. Any suggestions? var ratiosObj = {ratios:[{idRatio:1,Descripcion:"HoraMaxima",horas:10,Descuento:5}]}; var fila = 2; var horas = "horas"; var horasFin; var pre...
asked by 06.04.2017 / 11:05
1
answer

Null pointer exception when filling a JcomboBox with objects (object classes generated with hibernate)

At the time of filling a JcomboBox with an object that I bring directly from the class generated with hibernate I jump a null pointer exception , the generated classes are fine (I have looked a thousand times) package InterfazPrueba; im...
asked by 25.04.2017 / 12:02
1
answer

Extract image from a JPanel

Good morning, I have a problem, and I do not know how to get the image of a jpanel and transform it to an Image object, I tried with the following code: private static BufferedImage createImage(JPanel panel) { int w = panel.getWidth();...
asked by 05.04.2017 / 08:32
1
answer

Spring MVC that makes the mvc tag: annotation-driven /

In a Spring MVC web application in the XML configuration file the examples that I have seen use the tag I would like to know what the same is for me.     
asked by 25.03.2017 / 14:32
1
answer

SQL Error BLOB Syntax

I am using XAMPP MySQL and I have created a table to which I have named users and within it created the following: userid: INT type PRYMARY KEY AUTO_INCREMENT name: of type VARCHAR (20) photo: BLOB type When I try to save the photo in...
asked by 30.05.2017 / 00:45