Java swing java.lang.IllegalStateException

Question

First of all i am only programming 6-7 months in a school envirement so this might be a stupid question.

In class we just recently learned about AWT and SWING. So while i was reading up on it i decided to test some things out and incorporate some in my program for the exams in a copple of months.

So what i did was make a GUI where if you press a button you got to a class called VoegToe and add a parameter (Trein trein).

Now i tried to add a GroupLayout but after recieving a error like this i realy have no clue where to start or what i have done wrong.

The error :

java.lang.IllegalStateException: javax.swing.JButton[,0,0,0x0,invalid,alignmentX=0.0,alignmentY=0.5,border=javax.swing.plaf.BorderUIResource$CompoundBorderUIResource@7a3cdf,flags=296,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=javax.swing.plaf.InsetsUIResource[top=2,left=14,bottom=2,right=14],paintBorder=true,paintFocus=true,pressedIcon=,rolloverEnabled=true,rolloverIcon=,rolloverSelectedIcon=,selectedIcon=,text=Annuleer,defaultCapable=true] is not attached to a horizontal group

The code

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

/**
 * Voeg loco of wagen toe aan het systeem
 *
 * @author Pieter-Jan Casteels
 * @version 2017-04-27
 */
public class VoegToe
{
    private Trein trein;
    private JFrame frame;

    /**
     * Constructor voor objects van class VoegToe
     */
    public VoegToe(Trein newTrein)
    {
        setTrein(newTrein);
        //makePopUp();
    }

    /**
     * Setter voor de Trein classe
     * 
     * @param Trein de huidige Trein
     */
    private void setTrein(Trein newTrein)
    {
        trein = newTrein;
        //makePopUp();
    }

    public void makePopUp()
    {
        // DropDown voor het selecteren van wagen of Loco
        String[] comboFill = {"Wagen", "Loco"};
        JComboBox locoWagen = new JComboBox(comboFill);

        JTextField wagenNummer = new JTextField();
        JTextField lengte = new JTextField();
        JTextField massa = new JTextField();
        JTextField lading = new JTextField();
        JTextField remming = new JTextField();
        JTextField handRem = new JTextField();

        JButton voegToeButton = new JButton("Voeg Toe");
        JButton resetButton = new JButton("Reset");
        JButton annButton = new JButton("Annuleer");

        frame = new JFrame("Voeg Wagen of Loco toe");
        Container frameContent = frame.getContentPane();
        GroupLayout layout = new GroupLayout(frameContent);
        frameContent.setLayout(layout);

        layout.setVerticalGroup(layout.createSequentialGroup()
            .addGroup(layout.createParallelGroup()
                .addComponent(locoWagen)
                .addComponent(wagenNummer)
                .addComponent(lengte))
            .addGroup(layout.createParallelGroup()
                .addComponent(massa)
                .addComponent(lading))
            .addGroup(layout.createParallelGroup()
                .addComponent(remming)
                .addComponent(handRem))
            .addGroup(layout.createParallelGroup()
                .addComponent(voegToeButton)
                .addComponent(resetButton)
                .addComponent(annButton))
        );

        frame.pack();
        frame.setVisible(true);
    }

    /**
     * Voeg een wagen toe zonder schroefrem
     * 
     * @param long de nummer van de wagen
     * @param intiger lengte van de wagen in CM
     * @param intiger de massa van de wagen in KG
     * @param intiger de massa van de lading in KG
     * @param intiger de remming van de wagen
     */
    public void addWagen(long newWagenNummer, int newLengte, int newMassa, int newLading, int newRemming)
    {
        Wagen wagen = new Wagen(newWagenNummer, newLengte, newMassa, newLading, newRemming);
        trein.voegWagenToe(wagen);
    }

    /**
     * Voeg een wagen toe met schroefrem
     * 
     * @param long de nummer van de wagen
     * @param intiger lengte van de wagen in CM
     * @param intiger de massa van de wagen in KG
     * @param intiger de massa van de lading in KG
     * @param intiger de remming van de wagen
     * @param intiger remming van schroefrem
     */
    public void addWagen(long newWagenNummer, int newLengte, int newMassa, int newLading, int newRemming, int newRemmingSchroefrem)
    {
        Wagen wagen = new Wagen(newWagenNummer, newLengte, newMassa, newLading, newRemming, newRemmingSchroefrem);
        trein.voegWagenToe(wagen);
    }

    /**
     * Voeg een Locomotief toe
     * 
     * @param long de nummer van de loco
     * @param intiger lengte van de loco in CM
     * @param intiger de massa van de loco in KG
     * @param intiger de remming van de loco
     */
    public void addLoco(long newLocoNummer, int newLengte, int newMassa, int newRemming, boolean newAlsVoertuig)
    {
        Loco loco = new Loco(newLocoNummer, newLengte, newMassa, newRemming, newAlsVoertuig);
        trein.voegLocoToe(loco);
    }
}

I hope there is someone who sees what i have done wrong and be able to explain in newby language :)

Java swing java.lang.IllegalStateException

Answers (1)

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