Questions tagged as 'java'

Tagged questions
2
answers

Problems with the result of a sum between double numbers [duplicate]

I want to do the following calculation: 615.6555 + 566 I expected this result: 1181.6555 However, this is returning this: 1181.6554999999998 How do I solve this problem?     
asked by 22.01.2018 / 07:07
1
answer

Retrieve items from ListView

I'm trying to create a sales application, where in the order I select the product to be sold and click on an add button, and the selected product is thrown into a listview when the seller has finished selecting all products and add in the listvi...
asked by 11.05.2016 / 14:54
1
answer

Problem starting java program with windows

Important explanations: I have an application created in JAVA; An "EXE" executable was created using Launch4J; I need to run this application after windows startup. FIRST ATTEMPT A shortcut has been created in C:\Users\Elfab\A...
asked by 05.05.2016 / 22:19
2
answers

Error inserting data into table

Opening Connection: private static final String USUARIO = "root"; private static final String SENHA = "123456"; private static final String URL = "jdbc:mysql://127.0.0.1:3306/escolabd"; private static final String DRIVER = "com.mysql.jdbc.Driv...
asked by 24.05.2016 / 18:35
1
answer

error: 'List' is abstract can not be defined

I intend to use java with Android Studio to make a calculator, however, every time I click a button I add to a list the values of those buttons. But having error in declaring the list. someone can help me?     
asked by 06.03.2016 / 21:57
1
answer

How to center an imageview on screen via code? [closed]

I created a imageView via code and would like to know how to center it on the screen     
asked by 03.03.2016 / 13:07
1
answer

How to know which activity is open, running?

I have two activities, Activity1 and Activity2. I need to know if 2 is active or not in both activities. Example: if (activityrunning == activity2){ //do something }else{ //do something else } Thank you!     
asked by 01.02.2017 / 20:41
2
answers

Select in Oracle - Java

I'm trying to run a connection test in the bank and extract some information, just for the same study, however I'm running into the following error: Exception in thread "main" java.sql.SQLException: ORA-00923: palavra-chave FROM não localizada...
asked by 14.01.2016 / 13:13
1
answer

Component ui: JSF composition does not work

I'm creating an example template but when the page opens it is blank, the template and page that tries to pull the template follows: master-template.xhtml: <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE html PUBLIC "-//W3C//DT...
asked by 15.10.2015 / 03:17
2
answers

Pass random values to Matrix

I have a matrix with 30 fixed values, I wanted to know how to generate these same 30 values, however random, if possible with value limit between (2400, 400). How the array is currently: private int[][] coordenadas = { { 238...
asked by 20.10.2015 / 13:49