Questions tagged as 'java'

Tagged questions
3
answers

ANDROID: How to identify the density of the user's screen?

I want the application to only download images that are adaptable to the user's screen, for example: if the user's device supports xxhdpi images, it is not necessary to store the xxxhdpi, mdpi, hdpi, and There you go ...     
asked by 26.08.2015 / 03:52
1
answer

Algorithm in Java, increase age;

I wanted to know how to do an algorithm where I entered a year, and the value increased with age, like year 2016 = 1, year 2017 = 2, in a method. Something like this: int fazAniversidade(int ano) { if(ano == 2015) { this.idade +...
asked by 09.07.2015 / 23:45
1
answer

Error: expected {when creating a class

I wrote the code below but it is giving me the error    Expected { After my class declaration public class book(string title, string text){ string _title = title; string _text = text; void NewTitle (book livro, string newtit...
asked by 28.09.2015 / 23:33
1
answer

Inheritance, polymorphism and access to methods

I have 3 classes and 1 enum : public class Pessoa { private TipoPessoa tipo; public TipoPessoa getTipo() { return tipo; } public void setTipo(TipoPessoa tipo) { this.tipo = tipo;...
asked by 25.03.2018 / 19:57
2
answers

Should I stop the application when I run a test

Currently I have my application in production and I need to create some tests (Junit). My question is if I need to stop the application or can I run the direct test. Has anyone passed or knows anything about this?     
asked by 19.03.2018 / 18:27
2
answers

PreparedStatement is not working

Code I'm using PreparedStatement i = conexao.prepareStatement("INSERT INTO teste VALUES (player='teste', level_1=0, level_2=0, level_3=0, level_4=0, level_5=0, level_6=0, level_7=0, level_8=0, level_9=0, level_10=0)"); i.executeUpdate(); Ta...
asked by 13.06.2015 / 19:17
4
answers

Encrypt password in Java with sha256 Hash

I need to compare the password that the user is putting in a login screen with the one that is saved in the database, I discovered that when the user is registered, the hash sha256 to encrypt the password, but I'm not able to find how to encr...
asked by 12.05.2017 / 22:19
1
answer

Doubt about the initiator block

I would like to know why the code compiles but does not execute? Follow the code: package exemploinicializador2; public class ExemploInicializador2 { private String nome = "Aurélio"; private String sobrenome = "Soares"; private...
asked by 09.05.2017 / 20:41
4
answers

How to get and format the current date and time?

I would like to know how to get the current date and time and then format them in JAVA. For example, I have these two values: 23062017 212010 I want to store each value in a variable, and then I want to format it like this: 23/06/2017...
asked by 23.06.2017 / 17:16
2
answers

(Java, Android) Button - Set Click's limit

Well, can someone tell me how to set a limit for the number of clicks on a button, and when I reach that limit, will I prevent the button from being clicked again? Here it is: public void N1(View v) { EditText editTextView = (EditText)...
asked by 30.07.2017 / 14:08