Questions tagged as 'java'

Tagged questions
2
answers

Error connecting Bluetooth printer Andoid Studio

I am new to the programming in android studio, I am generating an interface to connect a Bluetooh printer with the help of the included SDK but when calling the method that made the connection I generated the following error, an expert that coul...
asked by 28.02.2018 / 22:56
1
answer

Send mail from java

I want to send an email from my Java 8 program to a configurable recipient (gmail, hotmail or corporate) without having to authenticate the sender or make a login, to send the mail. Is this possible in Java 8? public static void main(String[]...
asked by 13.02.2018 / 16:56
3
answers

How to generate two whole Randoms in Java

How can I generate a random number of whole characters in java a = Math.random () * 25 + 1;  System.out.println (Math.round (a)) // the 25 sets the limit     
asked by 13.02.2018 / 02:38
0
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Volley Headers Customs Java Android

Testing in my app I notice that the headers of my app do not reach the server, I have the following method private ObjetRequest<BaseRequest> objectRequest; objectRequest = new ObjetRequest(1, "", BaseRequest.class, "", new Respo...
asked by 14.02.2018 / 20:15
0
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Problem filling ComboBox in Java (Eclipse)

I had already loaded a similar question but it did not work. The idea is a recipe program. I have a class called "Input", several inputs are registered, and then those inputs (one or more) are loaded into a "Plato" (another class). The supplies...
asked by 22.02.2018 / 00:00
1
answer

Capture Java JavaScript variables

I would like to capture JavaScript variables in a Java class. For example, I am working with digital signatures on the client side and I need to verify the server side signature. So, I need the signature that I generated from the browser, whi...
asked by 20.02.2018 / 19:54
6
answers

What is the solution to all present, past and future NullPointerException errors?

I have my Java program and I get a NullPointerException and I have seen other questions but they are from people with other programs and it does not work for my program and I want to leave here the 2,000 lines of my program so that you solve the...
asked by 08.01.2017 / 18:54
0
answers

Print document from Java choosing printer

I'm trying to print documents of type .docx (optionally if you can also in .doc or .pdf). The files are generated by a program in java  , and this saves them in a specific folder. I have this fragment of code that although it fulfills the functi...
asked by 12.02.2018 / 22:23
1
answer

What does the cast "getFrom () [0]"

Good afternoon / Nights / Days I'm a newbie in java, I've been working on it for a few months ... basically it's the first programming language I've dedicated myself to, I find myself with a doubt, which this kind of casting refers to From....
asked by 16.02.2018 / 17:39
1
answer

Error opening the Android studio database

I'm doing an application where I use a database. I miss this error 02-17 02:25:56.504 21955-21955/dev.mros.espanyaapp E/AndroidRuntime: FATAL EXCEPTION: main java.lang.RuntimeExc...
asked by 16.02.2018 / 21:59