Questions tagged as 'java'

Tagged questions
2
answers

Computational cost of maintaining the instance of a variable in Java

I am conducting a study on energy consumption, and I wonder if maintaining the instance of a variable entails a computational (and therefore energetic) cost over time, beyond the consumption of memory and the cost of creating the own instance....
asked by 14.02.2017 / 10:12
2
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How can I calculate the letter NIF of a DNI?

ENUNCIADO: The algorithm to obtain the letter of the NIF corresponding to a DNI consists of the following steps: Obtain the rest of the entire division of the DNI by 23. The letter is the one in the indexed position of the following str...
asked by 13.02.2017 / 20:18
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Error in FileProvider: java.lang.NullPointerException when using FileProvider.getUriForFile ()

I have a problem when trying to share a file with other applications using FileProvider, the problem comes when I use FileContent.getUriForFile() because it gives me the following error: java.lang.NullPointerException: Attempt to invok...
asked by 14.02.2017 / 20:41
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Problem with accents and special characters [duplicate]

I'm doing an app that consumes the information of a php and I have a problem with the accents and special characters. The code works perfectly but when I get the information returned from the php in json the characters and accents are returned...
asked by 11.06.2017 / 21:31
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How to consult with JPQL or CriteriaBuilder?

I have three Classes: Client, Loan, Collector customers have many loans collectors have many loans a loan belongs only to a client and a collector, it must be the same for both between the clients and the loans there is a table that...
asked by 29.01.2017 / 21:08
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Image is not shown in the corresponding item

I am using a RecyclerView to show a list in which each item contains text and images (I will search for the image from a url with the ImageLoader in the method private void setImageNews(final ImageView view, String url) ). Wh...
asked by 09.03.2017 / 00:26
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The database does not run

I am running a database already created in another class, but I do not know why it is not running: In this code: DB baseHelper = new DB(this, "DEMODB", null, 1); SQLiteDatabase db = baseHelper.getWritableDatabase(); if(db != null){...
asked by 08.03.2017 / 05:17
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Help with a program that replaces words

I have to do the following exercise in Java with Eclipse:    Write a Java program that first reads two words from the console: the first will be called the pattern and the second substitution. Then the program will interactively read a series...
asked by 07.03.2017 / 20:39
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Doubt with animations on Android

The first doubt is how to stop the animation once it's done, right now it's a loop and I want it to only do the animation and stop once: ImageView img_check_guia3; @Override protected void onCreate(Bundle savedInstanceState) {...
asked by 08.03.2017 / 00:59
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how do I put an image of a folder in ireport java?

Hello friends could help me in a problem that I have, what I want is to get an image that is stored in a folder that is on a server that I am but which I have access to once I get this image for it in my report with ireport but, this image is sa...
asked by 11.01.2017 / 23:43