Questions tagged as 'java'

Tagged questions
2
answers

How can I not allow the user to enter numbers and only text in Java?

I am creating a program on register in which the user has to put name, password, email, etc. But in the fields such as name I want the user can only put text instead of numbers, and that case he put a number to appear a message to speak that he...
asked by 12.12.2015 / 22:08
3
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How to know how many objects were instantiated?

In a Java application, how do I know how many objects in a class were instantiated? This doubt came to me by reading the article mentioned in the link below. Here is the excerpt that gave me the doubt:    2.4 - Connection Factory       At...
asked by 05.11.2015 / 13:49
2
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java desktop "ajax" exists?

I wonder if there is any way to return the value for my java desktop application every time a value is added to a table. Something like browser ajax. For example, We have the requested table and with each record added to it my application scr...
asked by 11.11.2015 / 20:27
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Search by tree depth

I would like to develop an algorithm that does the depth search in a binary tree, but I am not getting it. When we make the tree we assign to each node the cost (cost to move from one node to the other) and the heuristic (heuristic value of e...
asked by 09.06.2015 / 19:28
1
answer

What are packages?

I'm starting with Phonegap and creating a project has the following structure: phonegap create helloWorld com.dominio.pasta HelloWorld But I never understood about this package. Is it a URL in reverse? What is it for? Can anyone explain me?...
asked by 02.06.2015 / 15:08
2
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What does Java FE and BE mean?

I'm starting with the Java language and today I came across a text mentioning Java ( FE and BE ). What do these acronyms mean?     
asked by 02.07.2015 / 16:53
1
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Sort dataTable by attribute

On the JSF page, it picks up the managed bean from the list of any objects. public class Ob implements Serializable { private Integer id; private Date data; private String descrição; } I wanted to mount the table more or less li...
asked by 13.07.2015 / 01:38
1
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How to send data via POST and retrieve in PHP?

How do I send the data via POST with the send-json method, value 0, following my PHP code: // Recupera os dados $nomeUsuario = $_POST['nome']; $cpfUsuario = $_POST['cpf']; $bairroUsuario = $_POST['bairro']; $emailUsuario = $_POST['email...
asked by 19.06.2015 / 22:14
3
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Animation in pictures

Is there any way to make an image rotate for example by 90 degrees when clicked on it? I want that by clicking on the image, it takes a turn, like a clock hand for example.     
asked by 14.08.2017 / 19:15
2
answers

Financial Mathematics Equation in Java

How can I encode this equation in Java? 750=(1-(1+j)^(-10))/j*86     
asked by 04.11.2017 / 02:33