Having several JComboBoxes with different values in a JTable

Question

I want to create a JTable where in a specific column named "Tools" a JComboBox should be accommodated. the values of the JComboBox should differ for each row.

In the constructor I have the following piece of code:

public Table(List<Software> software_list) throws TransformerFactoryConfigurationError, TransformerException, Exception {

    //****** create an 2D array object containing the emulators list data to be sent to the table model ******
    software_list_to_array = new Object[software_list.size()][5];


    for(int x = 0; x < software_list_to_array.length; x++){

        software_list_to_array[x][0] = software_list.get(x).getNumber();

        software_list_to_array[x][1] = software_list.get(x).getAuthor();

        software_list_to_array[x][2] = software_list.get(x).getReleaseDate();

        software_list_to_array[x][3] = software_list.get(x).getName();


        app_str = new String[software_list.get(x).getApp().size()];
        System.out.println(app_str.length);

        for(int k = 0; k < app_str.length; k++){
            app_str[k] = software_list.get(x).getApp().get(k).getName()
            + " " + software_list.get(x).getApp().get(k).getVersion();

        }
        software_list_to_array[x][4] = app_str;

    }

    tableModel = new SftTableModel(software_list_to_array, software_list_to_array.length);

    this.setModel(tableModel);

    this.setSize(new Dimension(1000,500));

    this.setRenderingProperties(app_str);

}

I have created the following method:

public void setRenderingProperties(String[] str){

    this.setRowHeight(25);

    this.getTableHeader().setFont(new Font("Arial", Font.BOLD,12));
    this.getTableHeader().setAlignmentY(Component.RIGHT_ALIGNMENT);
    this.setAutoCreateRowSorter(true);
    this.setShowGrid(false);
    this.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);

    ...........

if(app_str.length > 1){

    this.getColumn("Tools").setCellRenderer(new ComboBoxRenderer());
    JComboBox comboBox = new JComboBox();
    for(int k=0;k<app_str.length;k++){
        comboBox.addItem(app_str[k]);
    }

    this.getColumn("Tools").setCellEditor(new DefaultCellEditor(comboBox));
}else{
    this.getColumn("Tools").setCellRenderer(new CellsRenderer());
}
    this.getColumn("Tools").setResizable(true);
    this.getColumn("Tools").setPreferredWidth(250);

}

The problem with this code is that in the Tools column all the comboboxes contain all the same value. Does anyone have suggestion for this issue?

For better help sooner, post an [SSCCE](http://pscode.org/sscce.html). — Andrew Thompson, Oct 14 '11 at 12:12
You probably ought to use the toArray method to convert the list into an array instead of this ugly error prone for loop! — dm76, Oct 26 '11 at 10:49

score 3 · Accepted Answer · answered Oct 14 '11 at 15:58

You can override the getCellEditor(...) of the JTable to return a specific editor. Something like:

import java.awt.*;
import java.awt.event.*;
import java.util.List;
import java.util.ArrayList;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;

public class TableComboBoxByRow extends JFrame
{
    List<TableCellEditor> editors = new ArrayList<TableCellEditor>(3);

    public TableComboBoxByRow()
    {
        // Create the editors to be used for each row

        String[] items1 = { "Red", "Blue", "Green" };
        JComboBox comboBox1 = new JComboBox( items1 );
        DefaultCellEditor dce1 = new DefaultCellEditor( comboBox1 );
        editors.add( dce1 );

        String[] items2 = { "Circle", "Square", "Triangle" };
        JComboBox comboBox2 = new JComboBox( items2 );
        DefaultCellEditor dce2 = new DefaultCellEditor( comboBox2 );
        editors.add( dce2 );

        String[] items3 = { "Apple", "Orange", "Banana" };
        JComboBox comboBox3 = new JComboBox( items3 );
        DefaultCellEditor dce3 = new DefaultCellEditor( comboBox3 );
        editors.add( dce3 );

        //  Create the table with default data

        Object[][] data =
        {
            {"Color", "Red"},
            {"Shape", "Square"},
            {"Fruit", "Banana"},
            {"Plain", "Text"}
        };
        String[] columnNames = {"Type","Value"};
        DefaultTableModel model = new DefaultTableModel(data, columnNames);
        JTable table = new JTable(model)
        {
            //  Determine editor to be used by row
            public TableCellEditor getCellEditor(int row, int column)
            {
                int modelColumn = convertColumnIndexToModel( column );

                if (modelColumn == 1 && row < 3)
                    return editors.get(row);
                else
                    return super.getCellEditor(row, column);
            }
        };

        JScrollPane scrollPane = new JScrollPane( table );
        getContentPane().add( scrollPane );
//      table.getColumnModel().getColumn(1).setCellRenderer(new ComboBoxRenderer() );
    }


/*
    class ComboBoxRenderer extends JComboBox implements TableCellRenderer
    {

        public ComboBoxRenderer()
        {
            setBorder(new EmptyBorder(0, 0, 0, 0));
        }

        public Component getTableCellRendererComponent(
            JTable table, Object value, boolean isSelected,
            boolean hasFocus, int row, int column)
        {
//          setFocusable(false);
            removeAllItems();
            addItem( value );
            return this;
        }
    }

*/
    public static void main(String[] args)
    {
        TableComboBoxByRow frame = new TableComboBoxByRow();
        frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
        frame.pack();
        frame.setVisible(true);
    }
}

I think that this is real answer for OP, simple, clear and I only to want to change value from Arrays to the ComboBoxModel — mKorbel, Oct 14 '11 at 16:22

score 2 · Answer 2 · edited May 23 '17 at 10:28

2

since this code is too old, but I not remember that I seen another better, simple usage with example here

edited May 23 '17 at 10:28

Community

1
1

answered Oct 14 '11 at 11:47

mKorbel

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score 1 · Answer 3 · edited Oct 14 '11 at 12:13

1

I think that the main problem is that your app_str String is only instantiated once. Then at the end, everything is set to the last value of this instance.

edited Oct 14 '11 at 12:13

Andrew Thompson

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answered Oct 14 '11 at 11:35

Frederik.L

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Having several JComboBoxes with different values in a JTable

3 Answers3

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