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JCheckBox in JTable

Posted on 2001-09-04
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Last Modified: 2008-02-01

How can I put JCheckBox i all cells i the 3rd colum, in a JTable?


import java.sql.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class TableDisplay extends JFrame
{
     
     private JTable table;
   
     public TableDisplay()
     {    
      setSize(400, 400);
           
         table = new JTable(3,4);
         JScrollPane scroller = new JScrollPane( table );
         getContentPane().add(scroller);  
            show();
       }

        public static void main( String args[] )
        {
         final TableDisplay app = new TableDisplay();

          app.addWindowListener(new WindowAdapter()
           {
          public void windowClosing(WindowEvent e  )
            {  
             
                System.exit( 0 );
            }
           }
           );

  }
}
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Comment
Question by:Saxo
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7 Comments
 
LVL 16

Expert Comment

by:heyhey_
ID: 6452627
afair you can find some sample code in the SwingSet demo (check jdk demos subdirectory)
0
 
LVL 1

Expert Comment

by:boazbl1
ID: 6452727
JTable uses TableModel to hold data.
you can implemet your own TableModel interface, or extend the AbstractTableModel or DefaultTableModel, and override the method

public Class getColumnClass(int column){
  if (column == 2) // the 3rd column
      return Boolean.class;
  else
      return super.getColumnClass(column);
}
0
 
LVL 9

Accepted Solution

by:
Ovi earned 400 total points
ID: 6452755
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;

public class TableEditors extends JFrame {
      private SmartTable table;
      private SmartTableModel model;
      
      public TableEditors() {
            init();
      }
      
      private void init() {
            getContentPane().setLayout(new BorderLayout());
            setSize(400, 300);
            setLocation(300, 100);
            table = new SmartTable();
            getContentPane().add(new JScrollPane(table), BorderLayout.CENTER);
            setVisible(true);
      }
      
      class SmartTable extends JTable {
   
            public SmartTable() {
                  model = new SmartTableModel();
                  setModel(model);
                  createColumns();
                  setForeground(Color.red);
                  setBackground(new Color(255, 239, 185));
                  setGridColor(Color.orange);
                  setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
     
     
      setRowHeight(35);
                  setSelectedRow(0);
                  setSelectedCol(0);
            }
            
            protected void createColumns() {
                  for(int i = 0; i<model.getColumnCount(); i++) {
                        TableColumn column = getColumn(model.getColumnName(i));
        column.setCellRenderer(new GenericRenderer());
        column.setCellEditor(new GenericEditor());
                  }
            }
   
            public void setSelectedRow(int row) {
                  if(row == -1)
                        return;
                  else {
                        setRowSelectionInterval(row, row);
                  }
            }
            
            public void setSelectedCol(int col) {
                  if(col == -1)
                        return;
                  else {
                        setColumnSelectionInterval(col, col);
                  }
            }
            
      }
 
      class SmartTableModel extends AbstractTableModel {
            protected ColumnDescriptor cols[] =  {
                  new ColumnDescriptor("Field1", 40, JLabel.LEFT),
                  new ColumnDescriptor("Field2", 50, JLabel.LEFT),
                  new ColumnDescriptor("Field3", 100, JLabel.LEFT),
            };
            protected Vector dObjects;

            public SmartTableModel() {
                  dObjects = new Vector();
      initModelData();
            }
   
    public void initModelData() {
          Object[] row = new Object[3];
      row[0] = "string"; row[1] = "string"; row[2] = "string";
      dObjects.addElement(row);
     
      row = new Object[3];
      row[0] = "string"; row[1] = "string"; row[2] = new JButton("button");
      dObjects.addElement(row);

      row = new Object[3];
      row[0] = "string"; row[1] = new JButton("button"); row[2] = "string";
      dObjects.addElement(row);

          row = new Object[3];
          row[0] = "string"; row[1] = new JButton("button"); row[2] = new JCheckBox("checkbox");
          dObjects.addElement(row);
     
          row = new Object[3];
          row[0] = new JButton("button");row[1] = new JCheckBox("checkbox");row[2] = "string";
          dObjects.addElement(row);
     
          row = new Object[3];
          row[0] = new JButton("button");row[1] = new JCheckBox("checkbox");row[2] = new JButton("button");
          dObjects.addElement(row);
          updateObjects();
    }

            protected void updateObjects() { fireTableDataChanged(); }
            public int getColumnCount() {      return(cols.length); }
            public int getRowCount() { return(dObjects.size());      }
            public String getColumnName(int c) { return(cols[c].name); }
            public boolean isCellEditable(int row, int col) {
          return((getObjectAt(row, col) instanceof String)?false:true);
    }
   
    public Object getObjectAt(int row, int col)  {
          return(((Object[]) dObjects.elementAt(row))[col]);
    }
   
            public Object getValueAt(int row, int col) {
                  if(getRowCount() <= 0)
                        return "";
                  if(row<0||row>=getRowCount())
                        return "";
      Object cellData = ((Object[]) dObjects.elementAt(row))[col];
      return(cellData);
            }
      }
 
      class ColumnDescriptor {
        public String name;
        public int width;
        public int alignment;
        
        public ColumnDescriptor(String n, int w, int a) {
          name = n;
          width = w;
          alignment = a;
        }
      }
      
  class GenericRenderer extends DefaultTableCellRenderer {
        public Component getTableCellRendererComponent(JTable table, Object value,
        boolean isSelected, boolean hasFocus, int row, int col) {
          Object o = model.getObjectAt(row, col);
      if(o instanceof JButton || o instanceof JCheckBox) {
            if(o instanceof JCheckBox)
                  ((Component) o).setBackground(table.getBackground());
            return((Component) o);
      }
      Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, col);
      return(c);  
        }
  }
 
  class GenericEditor extends DefaultCellEditor {
        JTable tbl;
        private int lastRow = 0;
        private int lastCol = 0;
    private Object editor;
   
        public GenericEditor() {
      super(new JCheckBox());
        }
        public Component getTableCellEditorComponent(JTable t, Object v, boolean sel, int r, int c) {
          tbl = t;
      lastRow = r;
      lastCol = c;
          Object o = model.getObjectAt(r, c);
      editor = o;
      if(o instanceof JButton || o instanceof JCheckBox)
            return((Component) o);
      editor = new JTextField(v.toString());  
      return((Component) editor);
    }
   
        public Object getCellEditorValue() {
      return(model.getObjectAt(lastRow, lastCol));
    }
        public boolean isCellEditable(java.util.EventObject ev) {      return(true); }
        public boolean shouldSelectCell(java.util.EventObject ev) {      return(false); }
        public boolean stopCellEditing() {
              tbl.editingStopped(new ChangeEvent(this));
          return(true);
    }
        public void cancelCellEditing() {}
        public void addCellEditorListener(CellEditorListener cel) {}
        public void removeCellEditorListener(CellEditorListener cel) {}
  }
 
      public static void main(String[] args) {
            TableEditors t = new TableEditors();      
      }
      
}
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LVL 9

Expert Comment

by:Ovi
ID: 6452758
Compile and runn'it
0
 
LVL 1

Expert Comment

by:boazbl1
ID: 6452768
well, Ovi's proposed answer looks good, and is very generic, but the question was how to use JCheckBox, so the simplest way is to return Boolean.class by the TableModel.
0
 
LVL 9

Expert Comment

by:Ovi
ID: 6452783
You have right of course, I just give a general solution and a general example in the usage of some cell editors and renderers, so the user can learn more things from a simple question.
0
 

Author Comment

by:Saxo
ID: 6452886

Thank you Ovi. I can use it.
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