Questions tagged as 'java'

Tagged questions
1
answer

Java doubt working with superclasses and subclasses

A question regarding a job I'm doing in java. It turns out that I have the next part of a superclass: public abstract class Jugador { private String nombre; private int cantVidas; private int nivelActual; public Jugador(String...
asked by 26.05.2018 / 22:31
3
answers

I do not get 2 decimals in the jTextField to pass it to a DB!

I'm going crazy and I do not know what to do, to see if someone can help me. I would like that in the jTextField9 I would only get 2 decimals ( 123.45 ), because like this I get many decimals (123.45322222). because then I want the result w...
asked by 24.05.2018 / 13:20
1
answer

How can I make it so that sesion.setAttribute ("Surnames", dbapellidos); take me two last names

I have a class in which I get two surnames from a database; dbapellidos=rs.getString("Apellidos"); but I want to pass it to a jsp page through session sesion.setAttribute("Apellidos", dbapellidos); and when I get it on the page, I only...
asked by 24.05.2018 / 08:41
2
answers

Doubt Scanner class in Java

I have this little code. It happens that when the time comes to enter the third data (the name), it jumps, it is as if it were automatically given to enter and could not write anything: Scanner sc = new Scanner(System.in); Syst...
asked by 28.05.2018 / 20:11
1
answer

Doubt with a test of a Java program

I have the following question about my Fundamentals of Programming class, the professor gives us the following code: import java.util.Arrays; public class blablabla { public static void main(String[] args) { int[] v1 = new int[] {9,6,2,...
asked by 18.05.2018 / 12:41
1
answer

Convert from double to BigDecimal in Java

I have a query ... I have the following code that generates a Pi number of 16 digits ... but I require 20 digits, so I thought it would be convenient to use the bigDecimal but I still do not know how to enter it. help (? Code: package io2...
asked by 18.05.2018 / 02:09
1
answer

Save Singleton class in file

I am trying to save the entire class that installs it in Singleton , not to save each array that we have independently but to save the entire class with the contents of its arrays but it explodes me and I do not know why. Can someone shed...
asked by 18.05.2018 / 10:49
2
answers

Help with Java code date date

Could you help me please, I have a date eg: Year / month / day 2018/05/05 I need that when I add a button this one adds me a month 2018/06/05 but the day remains the same, I have to put the variable in Date because I'm thinking of taking it t...
asked by 24.05.2018 / 22:21
1
answer

Instance abstract classes in Java

Every time I want to create an object of an abstract class with two daughters, I create the constructor by implementing the method. package ultimaIntentona; import java.util.ArrayList; public abstract class Personal { static int autonu...
asked by 24.05.2018 / 20:44
2
answers

How do I get the path of an image that is inside the folder of my project in JAVA

The image is being saved in for example C: \ Users \ abc \ Downloads \ Project \ image.png and within that folder are the subfolders of the project but I need an address that works on all computers, so how do I find the image inside that folder?...
asked by 09.05.2018 / 05:26