Constructor « Development « Java Swing Q&A

1. App hangs calling DefaultCellEditor constructor stackoverflow.com

I have control of a small piece of an application built on Eclipse, and I'm having a problem creating a DefaultCellEditor. The code actually uses a subclass of DefaultCellEditor, but ...

2. correct way of initializing variables stackoverflow.com

ok this is just a shot in the dark but it may be the cause of most of the errors ive gotten. when your initializing something. lets say a smal swing ...

3. Is it good programming practice? Constructors and instance variables stackoverflow.com

In Java, would it be a bad programming practice to do anything other than instantiate your instance variables inside your constructor? I'm making a GUI right now, and I was thinking about ...

4. Which constructor implementation is correct? stackoverflow.com

Example 1

import javax.swing.*;
import java.awt.*;

public class Painter extends JPanel{

  public Painter(){
     buildGUI();
  }

  private void buildGUI(){
    JFrame frame = new JFrame();
  ...

5. how to find out the constructor? coderanch.com

I THINK this is what you are asking // TextField needs to be in a GUI somewhere import java.awt.*; class Test extends Frame { public Test(){ TextField theTextField = new TextField("This is in the TextField"); add(theTextField); setSize(400,300); setVisible(true); String theString = theTextField.getText(); //grab what is in the TextField; Test1 t1 = new Test1(theString); //Make this just for fun } public static ...

6. Implement this constructor coderanch.com

I've been unable to run this code. I tried to implement this constructor in a class. Does anyone have any suggenstions? What i've tried hasn't worked. public void GridBagDemo() { super("GridBagLayout"); //Frame with title setFont(new Font("Helvietica", Font.BOLD, 18)); addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent evt){System.exit(0);} } ); setSize(220, 200); Button button; GridBagLayout gridbag = new GridBagLayout(); GridBagConstraints c = new GridBagContstraints(); setLayout(gridbag); ...

7. Help on scope and default constructors coderanch.com

I think I have a relatively simple problem, but I've been banging my head against the wall for days. I have a main class that calls other classes from it's constructor to build a GUI. One of the classes is a set of JButtons and another class is a JScrollPane. The ActionEventHandler class that I have attached to the buttons needs ...

8. i want to call main class constructor from inner class or smt... coderanch.com

Hi I have a simple problem, but i don't know how to solve it. The situation is: Program has main class Hero and the constructor Hero() where are several panels. One panel has buttons. Each panel is defined in inner class. Now i want to do so that, if i press button from lets say buttonPanel i want to see something ...

9. The variables do not pass to the constructor coderanch.com

I have the following piece of code - see below; The values in the column arrays newvoltmag and deltaVoltages1 are not passed into the constructor for the BusbarFormation class and i can not understand why. } for(int x=0;x<=deltaVoltages1.length-1;x++) { System.out.println("These are the deltaVoltages " + deltaVoltages1[x]); System.out.println("This is deltaAngles" + deltaAngles1[x]); }//check to see if the values are in the array ...

10. GUI with constructor coderanch.com

hi, i'm trying to build a program to match a string of id to another string 1234567 with a GUI and constructor. but i'm struck and confuse on how to i continue with the constructor method please advice how do i carry on... import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.util.*; public class Id extends JFrame{ private JPanel p = (JPanel) ...

11. Constructor problem coderanch.com

I'm not sure what your first question means. Of course you can create a constructor for the main class. More than one if you want, assuming you make each one take different parameters. Maybe you mean you can't call the constructor from the main() method, but that's perfectly fine too. As for your second question, constructing, sizing, and making a frame ...

12. trouble with constructor coderanch.com

13. using constructors in gui programs coderanch.com

14. How to invoke constructor inside the method of SwingTimer to update LookAndFeel java-forums.org

My problem here is i dont now how to invoke Code #3 inside the method of Timer plss help. //Code #1 NewJFrame class -- start NewJFrame constructor --- start javax.swing.Timer t = new javax.swing.Timer(1,new ActionListener() { public void actionPerformed(ActionEvent e) { new LookAndfeel(this); //<-- this one is a method but it does not work //to update the LookAndFeel of NewJFrame //how ...

15. Constructor java-forums.org

Hi all I have a problem to use Constructor value.Menu Item consturct call in run() method then i am geting proble. Problem is after some time of interval menu dialog is appear and disappear autometically. Plz Any one tell me how can i remove this problem.If any one need code then i give him.. Plz help me...

16. swing design queston/ lots of gui code in constructor forums.oracle.com

Hi, I'm working through the O'Reilly book on Swing, and a lot of the examples in the book have the majority of the gui code in the constructor. I guess that would make sense, since the constructor deals with things that happen when an object of that type is created, but this is my first experience with seeing so much code ...