Questions tagged as 'java'

Tagged questions
2
answers

Error with FileOutputStream

I'm trying to save an image of ImageView in the gallery of my mobile device and the problem is that I'm always creating the directory where I want to save the image and then the path when I'm going to do the% % co tells me that it does no...
asked by 29.08.2017 / 14:30
2
answers

Java: Singleton in the same class

I have a doubt about the fact that it is possible to create a Singleton in a class where I have getters, setters and the Singleton I want to create it in the constructor, if possible you could give me an example please. Thanks pu...
asked by 01.12.2016 / 02:05
3
answers

Local Database in Java

I want to develop a website that works with MySQL, but at the same time I want that platform to be used from a desktop software. I'm doing it with java, and I'm new to that, I want to know how I could use a fully local database with java, whic...
asked by 21.09.2016 / 18:31
2
answers

How to execute a Mysql Script from java in linux?

I'm trying to execute a script .sql generated with MySQL from a java application, I have read and researched different ways to do it and I have found several options (none of which had worked for me) and I found the following block of code : p...
asked by 14.01.2018 / 07:21
4
answers

Doubts about J2EE [closed]

I am learning to work on the J2EE platform, and a series of questions have arisen, I would like a less technical response than in the documentation Oracle offers. As a development environment selection I am using NetBeans , for its man...
asked by 02.11.2016 / 13:44
3
answers

Error NullPointerException in Java (Spring-boot)

I already know that this is a very common error and it happens when trying to access a NULL type object, the problem is that I do not know why it is NULL if I'm supposed to be instantiating it, I have a class called NoteController in the that in...
asked by 28.03.2018 / 21:35
2
answers

When to reference and when to instantiate

I have a question, what is the difference between these 2 ways of storing an object? In this first form I create an object and assign it to another one that is the result of a search in the database: User user = new User(); user = userService....
asked by 23.02.2018 / 16:40
2
answers

Problem with JSON file?

I'm following a tutorial on how to create a gallery on android with glide and the information is in a file .json the code looks like this [{ "name": "Deadpool", "url": { "small": "http://api.androidhive.info/images/glide/small/deadpool.jpg...
asked by 01.11.2016 / 22:46
1
answer

Send text to My Band 2 from Android BLE

Does anyone know how to send text to the MiBand 2 from android? So far I am able to send numbers but not strings and I do not know how to do. @Override public void onServicesDiscovered(final BluetoothGatt gatt, int status)...
asked by 02.06.2017 / 09:17
0
answers

Problem with Searchview android

Good to the problem, first I have a Searchview in my actionbar . I have a listview with a arraydapter custom which I fill with data that I send from the webservices and I through the class Asynctask full listivi...
asked by 09.06.2016 / 20:25