Questions tagged as 'java'

Tagged questions
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Close a Dialogo When you click the back button

I would like the Dialogo open to be closed when I click the return button on the phone. I know that to close a dialog we use dismiss , but I do not know how we declare the back button on the phone. public class DialogValor { Button butNum...
asked by 27.05.2018 / 19:35
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How to configure the Auditor using Spring Boot 2.0.2

Here is a class I used with the spring framework version 4.3.4.RELEASE (I still did not use the spring boot) and it worked: import org.springframework.data.domain.AuditorAware; import org.springframework.security.core.Authentication; im...
asked by 23.05.2018 / 19:02
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addView (View, LayoutParams) is not supported in AdapterView when accessing the activity "Home"

I'm developing a shopping cart for Android using Firebase and I'm having problems using RecycleView, since the activity is crashing after user login, producing the following error. Log 05-24 17:38:02.156 9775-9775/com.cars.evd.dealership...
asked by 24.05.2018 / 19:45
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How do I call a component and its properties in the Fragment?

I needed to enter Fragment to execute this method Verifcar() on main Activity to check the condition and not show RecyclerView . MainActivity.Java public void Verificar(){ if(pref.getBoolean(Constants....
asked by 24.05.2018 / 15:44
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How to implement Abstract Data Type?

Good night, I need to do a TAD point implementation, I'm getting to do in Python, but the problem is that it should be implemented in Java and I have no idea how to get started. import math class Ponto(object): def __init__(self, x=0, y=0):...
asked by 09.05.2018 / 05:32
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TCP / IP communication using Socket

I need to do a college job, where it is necessary to do TCP / IP communication something like a "chat chat" is what I have in mind to do. But some questions have arisen, I do not know exactly how to ask them so I made a drawing in two ways that...
asked by 06.05.2018 / 18:02
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Redirect Servlet to JSP passing data

I am doing a library project, I register Book, Publisher and Parents and then view them in the JSP. When I register the data appear normally in the JSP but if I refresh the page they are re-registered. I've never used Servlet and JSP before....
asked by 11.06.2018 / 00:43
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Difference between method and function? [duplicate]

Because in Java it is called a method and in Kotlin it is called a function, it is just a different nomenclature, or is there any significant difference? Java: public class Teste { public static void main(String[] args) { int re...
asked by 09.05.2018 / 14:34
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Download bank data in csv format

I am trying to download the database data in csv format but it indicates that the SQL syntax is wrong. public void exportarBaseRespostaPI() { String banco = "b2wentregascorreios"; String tabela = "baserespmanifest"; String caminho...
asked by 09.05.2018 / 18:03
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Calculation of derivatives in Java

Hello, good morning. I am here asking for a light for a problem that I have, my programming teacher asked us to make a code that calculates the derivative of a function in java, but I am without a north to start the code, could anyone give a...
asked by 09.05.2018 / 16:42