Jcombobox inside a Joptionpane

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Good morning, I have a list of some reasons

 private List<Motivo> motivos;

And I need to fill a jComboBox with this list and get the selected option.

Currently I did with Messagedialog where I can fill normally but I can not get the selected item, follow example:

 JComboBox jcb = new JComboBox();
    for (Motivo motivos_bloqueia : motivos) {
        jcb.addItem(motivos_bloqueia.getMotivo());

    }

JOptionPane.showMessageDialog(null, jcb, "Selecione o motivo", JOptionPane.QUESTION_MESSAGE);

But this way I can’t get the selected item.

I read in some forums where I was directed to use an Inputdialog instead of Messagedialog, as follows:

Object[] opcoes = {"Um","Dois","Tres","Quatro"};
Object res = JOptionPane.showInputDialog(null, "Escolha um item" , "Selecao
de itens" ,
JOptionPane.PLAIN_MESSAGE , null ,opcoes,"");

That way I would have the item selected in the variable res. The problem is that the parameter it passes to the combobox to add the items in the options is an Object[] and in the case what I have is a List.

How I can get the item that the user selected in the combobox by clicking OK?

java swing

  • Take a look now @diegofm

  • I made an example just like yours and there was no problem. Be more specific where the problem is occurring, the code reported is not wrong.

  • I tried to edit it, I don’t know if it helped. Being more direct to the point, I need to GET the user-selected item in jComboBox by clicking OK on my Joptionpane. I only managed to do this using showInputDialog by passing the items to the combo box as Object[], but I have a List<Reasons> and can’t use Inputdialog with it.

  • 1

    This approach is not very good, Joptionpane was made for simpler tasks, that you are trying to do, it would be the case to use a screen with Jframe and add the correct components in it. The return of Joptionpane is for less complex and simple things, where building a screen would cause more work than using this component.

  • 1

    Imagine if every thing you need to get from the user to do a Joptionpane? Your application will get extremely tiring to handle. Sometimes it is better to make a small screen and put everything there for the user to do everything q have to do and then you just treat his entries at once.

  • 1

    It really is a rather 'strange' approach. I wanted to avoid creating a new screen and do with Joptionpane because I would only have a jCombobox inside, let’s say that is not the correct method to be done hehe, I will replace. Thank you!

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2 answers

2


A JOptionPane does not return the contents of a component inserted in it, as a combobox, since each component already has all the methods necessary for its content to be manipulated. In the case of JComboBox, I believe there is a mistake, you will not get the item selected by JOptionPane, you have to call getSelectedItem() of the component itself to get this. See an example below, using your code:

JComboBox jcb = new JComboBox();

for (int i = 0; i < 6; i++) {
    jcb.addItem("motivo 0" + (i + 1));
}

JOptionPane.showMessageDialog(null, jcb, "Selecione o motivo", JOptionPane.QUESTION_MESSAGE);

JOptionPane.showMessageDialog(null, jcb.getSelectedItem(), "Opção selecionada", JOptionPane.INFORMATION_MESSAGE);

  • I got it, I figured it out with your explanation.

1

The question is not very clear. It seems that you want something to happen by clicking the button. In this case, use OptionDialog, that returns a int and, from the value returned, do something.

    JComboBox jcb = new JComboBox();
        for (Motivo motivos_bloqueia : motivos) {
            jcb.addItem(motivos_bloqueia.getMotivo());

        }

    int selecionado = JOptionPane.showOptionDialog(null, jcb, "Selecione o motivo", JOptionPane.QUESTION_MESSAGE);

    if (selecionado == 1) {
        //faça algo
    }

Note that you can use ENUM if your list of reasons is previously known. Simply assign each ENUM value an equivalent int.

  • He wants to pick up the selected item in the combo, not the return of jOptionpane.

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