Questions tagged as 'java'

Tagged questions
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How to make my default program to open a file type?

I have a Java application that is very simple, it represents a form and, based on what is typed in its JTextField , a file called "form.uniXml" is created. I defined the extension with this name already to make it the default of my system....
asked by 26.10.2015 / 20:58
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How to know the size of an object in memory?

I'm not behind a method / operator sizeof because I already understand that JAVA does not have this, but I need some way to measure at least on average how much an object spends from memory, even if it's using some kind of debug.     
asked by 12.06.2017 / 13:30
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How to calculate point cards

I'm developing an application that corresponds to the calculation of total hours worked on points cards, taking into account whether it is night time reduction or not and, if so, what is the night entry and exit. The problem is: To calcu...
asked by 21.06.2016 / 16:08
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Since H = 1 + ½ +1/3 + ¼ + ... + 1 / N, make an algorithm to calculate H, where N is entered by the user

The program is only printing 1, it's as if it does not store the value of the variable h, can anyone help? Here is the code: public class MainUmSobreH { public static void main(String[] args) { double h = 0; int n = 4; for(int i=1;...
asked by 22.03.2018 / 21:34
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Is it possible to place objects in an ArrayList as soon as it is instantiated?

Doubt applies not only to ArrayList , but to any type of List . Is it possible to add objects to ArrayList soon after we instantiate it, and without having to use the add() method? How can this be done with arrays ?...
asked by 05.01.2018 / 01:16
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When calling supername method when overwriting a method?

In a class we have several methods overlapping with @Override , and in some, for example onPreExecute of an extended class of AsyncTask , already comes with super.onPreExecute() . @Override protected void onPreExec...
asked by 09.03.2018 / 11:49
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How to create an infinite array?

I have a problem and I need to create an infinite, or rather undefined, array, so that I can enter as many data as I need ... How could I do it? I'm using JDK6.     
asked by 04.04.2014 / 11:51
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Formatting dates with calendar dd / MM / yyyy

I'm having trouble formatting the date for the dd / MM / yyyy format Como aparece: Sat Feb 26 11:38:28 BRT 2015 Como eu quero que apareça: 04-07-2015 Here is how I show on the screen JOptionPane.showMessageDialog...
asked by 04.07.2015 / 16:44
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Method does not override method from its superclass

I'm new to Java and I'm learning app for Android and on my route, I ran into this error: Method does not override method from its superclass The word @Override is underlined in red, but I could not understand the error. Here is the code:...
asked by 06.02.2016 / 17:21
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What is bind? [closed]

I can not find the meaning of Bind, let me explain what this is. I would like an example of Bind with the same java language.     
asked by 13.03.2016 / 19:41