Questions tagged as 'java'

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java class in IntelliJ

I have imported a maven project with IntelliJ and the java classes come up with this symbol and I can not execute its main what does it mean and how can I solve it? I usually get the symbol of a C, which I imagine is compiled. Thanks  ...
asked by 08.12.2017 / 12:52
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How to save values of methods in collection (s)?

in my attempt to make cleaner codes, I want to learn to work with methods, but I do not know how to keep the values of these when they are called in another class Some of the methods I did are: Note: I do not know if they are correct or t...
asked by 09.12.2017 / 13:23
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how can I solve the java.lang.ClassCastException problem

I have a class for a login and when I login I get this:    com.logic.Teaching can not be converted to com.logic.Docente I have tried to assign a variable to the session, however I get this error, I always have to restart the server and I'...
asked by 09.12.2017 / 18:04
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doubly linked list

How can I implement a method that doubles even numbers in java with a doubly linked list? package doublelinkedlist; import node.node; public class DoubleLinkedList<T> { private node<T> start = null, end = null; public D...
asked by 09.12.2017 / 03:53
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how to correctly separate each token and do the operations

Develop a program that calculates a mathematical operation introduced in a machine but divided the operations between two computers. st= new StringTokenizer(ecuacion," "); while(st.hasMoreTokens()){ this.muestra.append(st.nextToken()...
asked by 06.12.2017 / 18:14
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Possible problems of an infinite loop in the connections with Database

I'm doing an infinite loop in which I call a method that is going to do a programmed task of modifying data in my BD. the loop is executed when I start my program. My question is whether this infinite loop would not bring me problems or defic...
asked by 06.12.2017 / 18:35
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Connect mysql from java

I created a free account in freehostia in which I have a mysql database which I need to use for a project I'm doing in Java. I have already made connections to mysql databases from now but in localhost, I know the password, user, name and por...
asked by 23.12.2017 / 22:30
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Download file from REST

Good afternoon, I hope you are having a good day and you can help me with the following problem .... I have the following resource: @RequestMapping(value = "/dowload", method = RequestMethod.GET,produces = { MediaType.APPLICATION_OCTET_STRE...
asked by 23.12.2017 / 19:34
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Problem when passing an image to a JasperReport

I'm trying to send an image as a parameter to a jasperRepor, but when I'm going to generate the report it tells me that the parameter is null. public void generarReporte(String ruta) throws JRException { try { // File reportFil...
asked by 06.12.2017 / 20:40
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Enter decimal point in an edittext

I have a problem, in an app of a calculator in android studio, simple, I have 2 EditText and that I enter numbers of phone(InputType="Phone") , for more than I have tried I do not know how to limit that only one point can be entered...
asked by 24.12.2017 / 04:59