Questions tagged as 'java'

Tagged questions
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Sort numeric vector without using Bubble sort

We usually learn in college that to sort entire vectors, we use a technique called bubble sort : int[] vetorOrdenado = new int[8]; vetorOrdenado[0] = 2; vetorOrdenado[1] = 41; vetorOrdenado[2] = 12; vetorOrdenado[3] = 6;...
asked by 27.01.2016 / 02:20
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ArrayIndexOutOfBoundsException in Java 8 Parameters Reflection

I was doing a code with reflection in Java 8 when I came across a strange behavior - an ArrayIndexOutOfBoundsException unexpected. Based on this, I've decided to create a minimal, complete, and verifiable example. First look at this co...
asked by 18.03.2015 / 15:21
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What are asynchronous processing and synchronous processing?

I'm having this doubt while I'm studying about the Handler class. In the book says that when a Thread is being used to perform some asynchronous processing and needs to update the graphical interface of the screen, it is required to use a...
asked by 05.09.2016 / 21:52
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Ionic is indicated for which types of applications?

Is the Ionic Framework indicated for which types of applications? I've been doing some research on cordova plugins, it seems to give a lot of trouble in multiplatform development, some plugins do not work well for iOS and Windows Phone ? T...
asked by 16.09.2016 / 18:47
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Recurring Doubt

I did table test but the result will never give 0 because it subtracts 1 from n but then it adds the result with n . The result of this question was 36 and I did not understand why. public class Recursivo{...
asked by 03.02.2016 / 17:58
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Why can this happen in a foreach?

I built two simple classes: import java.util.ArrayList; import java.util.List; public class Aluna { String nome; String idade; String cpf; List<Aluna> listar(){ ArrayList<Aluna> aluns = new ArrayList<>(); Aluna...
asked by 14.02.2016 / 17:34
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Why was the parameterized class attribute T not instantiated?

I have this class that implements the IDAO interface package DAO; import java.util.ArrayList; public class BdApp<T> implements IDAO<T> { ArrayList<T> lst = new ArrayList<T>(); //ArrayList<Administrador> lstAdm...
asked by 11.02.2016 / 00:31
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How to guarantee transactional atomicity in more than one concurrent Thread in a Java SE environment using the Spring framework?

A Java SE solution, using the Spring framework, is being developed to parallelize the execution of a Stored Procedure in Oracle 9i, which takes as parameter one or more rows from a giant file to be processed. This will be done through a Threa...
asked by 17.04.2014 / 18:14
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Why does Value in Spring MVC require an asterisk?

Why do I need to put * in value when there is nothing left? I mean, before using Spring MVC it worked without problems only as /planilha/ . getPlanilha works correctly but if it has the same RequestMethod and con...
asked by 31.03.2015 / 15:23
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Web application running in background

I'm working on a Java web application, and I'm creating and planning some specs. In some specific modules I need some executions running in the background on the server. For example, the user sends a file to the server with a request for proc...
asked by 15.08.2014 / 21:31