Questions tagged as 'java'

Tagged questions
2
answers

Multithreading thread in Java

I have here an exercise called Parking. I understand it slightly, but there is one thing that is not clear to me, and I refer to the parameter that has Semaphore sem = new Semaphore(este_parametro_me_refiero) . I appreciate the help! I lea...
asked by 04.03.2018 / 01:28
1
answer

Pass values between Activity AndroidStudio

I want to pass two values from one Activity to another, this is my code MainActivity public class MainActivity extends AppCompatActivity implements View.OnClickListener { EditText ip_intro; Button botonPlantaBaja; Button botonPlanta0;...
asked by 09.03.2018 / 11:54
2
answers

Because the java calendar does not work for hours and minutes

My problem is simple: because this method does not work for me when it's time is more than 30 minutes. I do not know exactly if it is for 30 but for 1 hour and 30 minutes it does not work. It just does not enter run () method of the Tempor class...
asked by 25.03.2018 / 12:04
2
answers

How to walk a [closed] arraylist

How to traverse an arraylist as long as it does not find the element and if at the end this element is not added to the lsita     
asked by 23.03.2018 / 13:46
1
answer

Problem with Counter in JSTL or change for a for (int i)

I need to carry a variable counter in an html using JSTL because the JSTL uses a Foreach instead of a for (int i ..) I tried with: Da error <c:set var="i" value="-1"/> <c:forEach items="${finalmente}" var="dato">...
asked by 12.03.2018 / 21:24
1
answer

Records with Arraylist java

I have to create a program which registers students and instructors with arraylist How can I use the instructor values to register it in the same course arraylist to register students to the class package examen; import java.util.ArrayList;...
asked by 13.03.2018 / 06:12
2
answers

How to select a row from a data table and send me to another page?

I have the following table, what I want to do is that when selecting a row, send me to another page to be able to show data according to the person you select in the table, <h:form> <p:dataTable var="consultaPersona" style="m...
asked by 26.02.2018 / 17:19
1
answer

Add actions to buttons

I have this code: How to add actions to the buttons of this calculator, for the moment it is only the intefaz and try to put the sum. import javax.swing.JFrame; import javax.swing.JTextField; import javax.swing.JButton; import javax.swing.J...
asked by 15.02.2018 / 16:14
1
answer

Polymorphism and Inheritance in Java

They commissioned me a job in which I must use the polymorphism and inheritance of POO, the problem is that of 4 "values" that I want to show only shows me 2, I would like to know if someone could give me an alternative for this, not It is somet...
asked by 14.02.2018 / 20:56
1
answer

I can not compile this class and I can not detect the error

package ex2; import java.util.Random; public class ExpSys { private Random ran; int Level = 1; int Exp_Base = 10; int Exp = 0; int Exp_Max = 0; public ExpSys() { this.ran = new Random(); Exp_Max = (Exp_B...
asked by 18.03.2018 / 17:07