Questions tagged as 'java'

Tagged questions
1
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How to control the number of items you see in a RecyclerView

As the question says, I have my RecyclerView filled with 50 elements approximately which by default are shown but what I'm looking for is to be able to give a specific number of elements that I want to see, I know that the getItemCount...
asked by 23.04.2018 / 19:06
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Export the result of the sql query to an excel with Java

That query throws me 3 rows what I want to put in an excel, thank you very much for your help. public class CrearFicherosExcel extends conect { public void CEXML(String url, String bd, String puerto, String usuario, String pasw) throws Cl...
asked by 01.09.2017 / 18:05
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get the name of the file downloaded by a url, I clarify the name of the file is different from the url

I need to download a pdf from my Android app but without stepping on the name, that is, when I enter the url " link "to generate the request to the server, this will verify if there is a pdf that refers to that time, if so, I will respond with...
asked by 30.08.2017 / 18:33
4
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Problems working with arraylist

I have a main class where I load the data into an arrayList and a class called material that I call from the arrayList to load data. The problem is that when loading data from the main class I do not have problems but if from another class I ent...
asked by 13.09.2016 / 13:23
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how to make a class jframe be main if I have previously defined the main class?

Well what I have is the following, a class main that I have put a connection that will take my jframe , but once done the main I started to create the interface, as I do so that when execute the interface appears, which was t...
asked by 29.06.2017 / 10:30
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Help Username in Jtextfield

I need to generate a "nickname" based on 3 jtextfield, which takes the first two letters of each text ... for example Juan Perez Gonzalez and let the nick name be JUPEGO     
asked by 18.04.2018 / 18:41
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How does the click count work in java? [closed]

I help how the click count works in java, if you could show me some examples of its use it would help me a lot     
asked by 21.03.2018 / 18:50
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Date - Calendar - System date in JAVA in real time Thread

I try to add to a JLabel the date and time of the current system running the application. It shows me the date and time of the system when launching / executing the file JAVA but it does not update it at the time of execution of the p...
asked by 10.01.2017 / 20:34
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Java, I can not find the error. (basic OOP) [closed]

package nueve; import java.util.Scanner; public class nueve { Scanner sc = new Scanner (System.in); private int arreglo=0; private String Nombres []; private int Legajo []; private int AñoNacimiento []; private int AñoEd...
asked by 30.05.2017 / 14:07
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Access a property of an object

How to access the property of an object or a related object, using classmetadata or reflection? Suppose we have these classes class Person { public String name; public void Person( name ) { this.name = name; } } cl...
asked by 17.01.2017 / 04:24