JTable = Cell Alignment

Is it possible to centre align data in a JTable cell? If possible, where can I see how to do so.
Thx

Here's an article that should help:
http://www-106.ibm.com/developerworks/java/library/j-jtable/index.html?dwzone=java

Similar Messages

  • JTable cells alignment

    Hi,
    I have one column en my table where I use a speciallized renderer (a JCheckBox). This is working fine, but now I want the checkbox to be centered on the cell. How do I do this ?
    Thanks

    OK, I solved it.
    Thanks anyway

  • J Table - Single Cell Alignment

    Hello everyone,
    import java.awt.BorderLayout;
    import java.awt.Color;
    import java.awt.Component;
    import java.util.Random;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.JScrollPane;
    import javax.swing.JTable;
    import javax.swing.table.DefaultTableModel;
    import javax.swing.table.TableCellRenderer;
    import javax.swing.table.TableColumnModel;
    public class RowColorTest
        private JTable table;
        public static void main(String[] args)
            new RowColorTest();
        public RowColorTest()
            javax.swing.SwingUtilities.invokeLater(new Runnable()
                public void run()
                    createGUI();
        public void createGUI()
            JFrame frame = new JFrame();
            frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
            String[] columnNames = new String[4];
            columnNames[0] = "Name";
            columnNames[1] = "Age";
            columnNames[2] = "Value";
            columnNames[3] = "Extra";
            Object[][] data = new Object[20][4];
            Random r = new Random();
            for(int a=0; a < 4; a++)
                for(int i=0; i < 20; i++)
                    if(i == 0 || i == 5 || i == 10 || i == 15)
                        data[i][a] = 23;
                    else
                        data[i][a] = r.nextInt(50);
            DefaultTableModel model = new DefaultTableModel(data, columnNames);
            table = new JTable(model)
                public boolean isCellEditable(int rowIndex, int vColIndex)
                    return false;
                public Class getColumnClass(int column)
                    return getValueAt(0, column).getClass();
                public Component prepareRenderer(TableCellRenderer renderer, int row, int column)
                    Component c = super.prepareRenderer(renderer, row, column);
                    TableColumnModel tcm = table.getColumnModel();
                    Object result = getValueAt(row, tcm.getColumnIndex("Value"));
                    if(result instanceof Integer)
                        if(((Integer) result) == 23)
                            c.setBackground(new Color(0, 255, 153));
                            c.setForeground(Color.BLACK);
                            if(column == 0)
                                    // I would like to do a CELL ALIGNMENT for this particular condition.
                                    // setHorizontalAlignment() does not exist for the object c (Component).
                        else
                            c.setBackground(Color.WHITE);
                            c.setForeground(Color.BLACK);
                            if(column == 0)
                                    // I would like to do a CELL ALIGNMENT for this particular condition.
                                    // setHorizontalAlignment() does not exist for the object c (Component).
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                        c.setBackground(Color.BLUE);
                        c.setForeground(Color.WHITE);
                    return c;
            JPanel panel = new JPanel();
            JScrollPane sp = new JScrollPane(table);
            panel.add(sp, BorderLayout.CENTER);
            frame.setContentPane(panel);
            frame.pack();
            frame.setVisible(true);
    }Sorry for bringing this up again, but I am having a hard time trying to "align" a single "cell". In the code that I have provided, I tried to find a method from the Component object for setHorizontalAlignment() hoping to make this call:
    c.setHorizontalAlignment(SwingConstants.RIGHT);
    However, it does not exist. How would I go about setting the alignment for an individual cell? I've searched the forum for "cell alignment" and found some information about using a DefaultTableCellRenderer, but I'm not sure how to merge that with the existing code that I currently have.
    In this thread: http://forums.sun.com/thread.jspa?forumID=57&threadID=659910 , camickr pointed out that I can use the row and column variables to find which cell to align, however once I've found the particular cell that I'd like to align, what do I do next? The component c does not have a method to set alignment in this scenario.
    Thanks again,
    Brianiak

    You - the programmer - know that the component in question will be a label of some kind. The compiler, however, does not. As far as javac is concerned, the component could be, say, a 3D animation, in which case setHorizontalAlignement would be illegal.
    In order to share our runtime knowledge with the compiler, we have to use some explicit casting:
    (JLabel)c.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);Note that this will lead to runtime errors if our component is not an instance of JLabel, so it's a good idea to surround the code with:
    if (c instanceof JLabel){
    }

  • JTextField/JTable-cell Button

    Is there any known efficient methods of creating the JTextField or JTable-cell Button as like in Forte's Component Inspector window where you click on the property value field and the value is displayed just left of a small button labelled "..." ie: [some text field with value][...] also referred to as the "ellipsis" buttons, or will most answers to this question simply describe the layout of a JField-JButton combination? The action from clicking on the [...] button aligned right of the JTextField simply invokes or displays a larger input interface in which upon completion of the entered data, returns the input to the related JTextField.
    Thanks to anybody for any help with this, and perhaps in return, I may be able to answer any non-gui java questions, or some not so unfamilliar GUI questions.

    Hello StanislavL and Lutianxiong,
    I remember asking this question some time ago, and the time has come again for me to seek this functionality. I have finally achieved the functionality and thought I would post the answer for anybody else. I had not realized that I had recieved a solution/reply to my original question as I come here to post the answer, and in fact, my solution does appear to be very similiar to your reply, StanislavL. As for you, Lutianxiong and other seekers of this info, here is my solution with a JFileChooser style input for the 3rd column which only shows gif,jpg and png files:
    <code>
    ------------- TableCellFileInput.java -------------------
    public class TableCellFileInput extends javax.swing.JPanel {
    private String extensions[];
    public TableCellFileInput(String fileExtensions[]) {
    extensions = fileExtensions;
    self = this;
    initComponents();
    private void initComponents() {
    valueField = new javax.swing.JTextField();
    fileButton = new javax.swing.JButton();
    setLayout(new java.awt.BorderLayout());
    valueField.setText("jTextField1");
    add(valueField, java.awt.BorderLayout.CENTER);
    fileButton.setText("...");
    fileButton.setMargin(new java.awt.Insets(0, 2, 0, 2));
    fileButton.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    fileButtonActionPerformed(evt);
    add(fileButton, java.awt.BorderLayout.EAST);
    private void fileButtonActionPerformed(java.awt.event.ActionEvent evt) {
    String filePath = valueField.getText();
    if(filePath != null && filePath.length() > 0) {
    filePath = new java.io.File(filePath).getParent();
    javax.swing.JFileChooser chooser
    = new javax.swing.JFileChooser(filePath);
    chooser.setFileFilter(new ImageFilter());
    int returnVal = chooser.showOpenDialog(this);
    if(returnVal == javax.swing.JFileChooser.APPROVE_OPTION) {
    valueField.setText(chooser.getSelectedFile().getAbsolutePath());
    class ImageFilter extends javax.swing.filechooser.FileFilter {
    public boolean accept(java.io.File f) {
    if(f.isDirectory()) return true;
    String fName = f.getName();
    if(extensions != null) {
    for(int i=0;i<extensions.length;i++) {
    if(fName.endsWith(extensions[ i ])) return true;
    return false;
    public String getDescription() {
    return DESCRIPTION;
    class CustomCellEditor extends javax.swing.AbstractCellEditor
    implements javax.swing.table.TableCellEditor {
    public Object getCellEditorValue() {
    return valueField.getText();
    public java.awt.Component getTableCellEditorComponent(javax.swing.JTable table, Object value, boolean isSelected, int row, int column) {
    System.out.println("fileEditor");
    if(value == null) valueField.setText("");
    else valueField.setText(value.toString());
    return self;
    public void setColumn(javax.swing.table.TableColumn column) {
    column.setCellEditor(new CustomCellEditor());
    private javax.swing.JButton fileButton;
    private javax.swing.JTextField valueField;
    private static final String DESCRIPTION = "Image File Filter";
    private java.awt.Component self;
    ------------- TestTable .java -------------------
    public class TestTable extends javax.swing.JFrame {
    public TestTable() {
    editorField = new javax.swing.JTextField();
    String fileExts[] = {"gif","jpg","png"};
    fileEditorField = new TableCellFileInput(fileExts);
    initComponents();
    javax.swing.table.TableColumn column
    = jTable1.getColumn("Title 3");
    fileEditorField.setColumn(column);
    private void initComponents() {
    jScrollPane1 = new javax.swing.JScrollPane();
    jTable1 = new javax.swing.JTable();
    addWindowListener(new java.awt.event.WindowAdapter() {
    public void windowClosing(java.awt.event.WindowEvent evt) {
    exitForm(evt);
    jTable1.setModel(new javax.swing.table.DefaultTableModel(
    new Object [][] {
    {null, null, null, "cats"},
    {null, null, null, "dogs"},
    {null, null, null, "mice"},
    {null, null, null, "birds"}
    new String [] {
    "Title 1", "Title 2", "Title 3", "Title 4"
    Class[] types = new Class [] {
    java.lang.Object.class, java.lang.Object.class, java.lang.Object.class, java.lang.String.class
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    return types [columnIndex];
    jScrollPane1.setViewportView(jTable1);
    getContentPane().add(jScrollPane1, java.awt.BorderLayout.CENTER);
    java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
    setBounds((screenSize.width-400)/2, (screenSize.height-300)/2, 400, 300);
    private void exitForm(java.awt.event.WindowEvent evt) {
    System.exit(0);
    public static void main(String args[]) {
    new TestTable().show();
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTable jTable1;
    private javax.swing.JTextField editorField;
    private TableCellFileInput fileEditorField;
    </code>

  • Centering text in JTable cells

    How do I center the text in JTable cells? By default, all data is left aligned.
    Thanks,
    Jason

    Read up on cell renderers from the Swing tutorial on "Using Tables":
    http://java.sun.com/docs/books/tutorial/uiswing/components/table.html#editrender
    Here's an example to get you started.
    import java.awt.*;
    import java.util.*;
    import javax.swing.*;
    import javax.swing.table.*;
    import java.text.*;
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        public TableRenderer()
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            Object[][] data =
                {new Date(), "A", new Integer(1), new Double(5.1), new Boolean(true)},
                {new Date(), "B", new Integer(2), new Double(6.2), new Boolean(false)},
                {new Date(), "C", new Integer(3), new Double(7.3), new Boolean(true)},
                {new Date(), "D", new Integer(4), new Double(8.4), new Boolean(false)}
            DefaultTableModel model = new DefaultTableModel(data, columnNames);
            JTable table = new JTable( model )
                //  Returning the Class of each column will allow different
                //  renderers to be used based on Class
                public Class getColumnClass(int column)
                    return getValueAt(0, column).getClass();
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            getContentPane().add( scrollPane );
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            //  Use renderer on a specific column
            TableColumn column = table.getColumnModel().getColumn(3);
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            frame.setVisible(true);
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        class CenterRenderer extends DefaultTableCellRenderer
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  • How to use Jtable cell Editor

    HI,
    Here trying to populate the ImageIcon using JLabel in Jtable cell. For that I used DefaultCellRenderer. For implement the mouseListener to label I used the DefaultCellEditor. I am facing one problem here. After editing the label I selected the second row of the table, the first row image is not displaying. Can any one help on this issue?
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    panel.setOpaque(true);
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    return this;
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    With more than 30 postings you should know by now how to use the "Code" tags when posting code so the code reatains its original formatting and is therefore more readable.
    There is no need to create a custom editor, here is a simple example.

  • JTable cell under Mouse positin?

    I have a need to update a control with information about a JTable cell that is currently under the Mouse pointer.
    No clicking, just moving the mouse around updates the other control with information depending on which cell is currently under the Mouse pointer.
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    Generally I assume these kinds of problems are either obvious problems in my code (at least, obvious to other people) or obscure interactions that are are royal PITA to track down.
    Apparently not in this case.
    * TestJTable.java
    * Created on Sep 14, 2010, 9:41:09 PM
    package testthing;
    import java.awt.Point;
    import java.awt.event.MouseAdapter;
    import java.awt.event.MouseEvent;
    import javax.swing.GroupLayout;
    import javax.swing.GroupLayout.Alignment;
    import javax.swing.JLabel;
    import javax.swing.JScrollPane;
    import javax.swing.JTable;
    import javax.swing.LayoutStyle.ComponentPlacement;
    import javax.swing.WindowConstants;
    import javax.swing.table.DefaultTableModel;
    * @author jlussmyer
    public class TestJTable extends javax.swing.JFrame {
        /** Creates new form TestJTable */
        public TestJTable() {
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         * WARNING: Do NOT modify this code. The content of this method is
         * always regenerated by the Form Editor.
        @SuppressWarnings("unchecked")
        // <editor-fold defaultstate="collapsed" desc="Generated Code">                         
        private void initComponents() {
            jScrollPane1 = new JScrollPane();
            tblTest = new JTable();
            lblInfo = new JLabel();
            setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
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                new Object [][] {
                    {null, null, null, null},
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                    tblTestMouseClicked(evt);
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            layout.setHorizontalGroup(
                layout.createParallelGroup(Alignment.LEADING)
                .addComponent(lblInfo, GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
                .addComponent(jScrollPane1, GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
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                layout.createParallelGroup(Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addComponent(jScrollPane1, GroupLayout.PREFERRED_SIZE, 275, GroupLayout.PREFERRED_SIZE)
                    .addPreferredGap(ComponentPlacement.RELATED)
                    .addComponent(lblInfo)
                    .addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
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            lblInfo.setText(txt + " row=" + row + ", pt.y=" + pt.y + ", " + tblTest.rowAtPoint(pt));
            return;
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        public static void main(String args[]) {
            java.awt.EventQueue.invokeLater(new Runnable() {
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        // End of variables declaration                  
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  • Can not show the JCheckBox in JTable cell

    I want to place a JCheckBox in one JTable cell, i do as below:
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    But when i run it, the "d" column show the string "false" or "true", not the check box i wanted.
    I do not understand it, can you help me?
    Thank you very much!
    coral9527

    Do not use DefaultTableModel, create your own table model and you should implement the method
    getColumnClass to display the boolean as checkbox ...
    I hope the following colde snippet helps you :
    class MyModel extends AbstractTableModel {
              private String[] columnNames = {"c1",
    "c2"};
    public Object[][] data ={{Boolean.valueOf(true),"c1d1"}};
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         //System.out.println("Calling getColumnCount");
         return columnNames.length;
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    //System.out.println("Calling row count");
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    return columnNames[col];
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    return getValueAt(0, c).getClass();
    * Don't need to implement this method unless your table's
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    public boolean isCellEditable(int row, int col) {
    //Note that the data/cell address is constant,
    //no matter where the cell appears onscreen.
    return true;
    * Don't need to implement this method unless your table's
    * data can change.
    public void setValueAt(Object value, int row, int col) {
    data[row][col] = value;
    fireTableCellUpdated(row, col);

  • Shading part of a JTable Cell dependent upon the value of the cell

    Hi
    Was hoping some one woudl be able to provide some help with this. I'm trying to create a renderer that will "shade" part of a JTable cell's background depending upon the value in the cell as a percentage (E.g. if the cell contains 0.25 then a quarter of the cell background will be shaded)
    What I've got so far is a renderer which will draw a rectangle whose width is the relevant percentage of the cell's width. (i.e. the width of the column) based on something similar I found in the forum but the part I'm struggling with is getting it to draw this rectangle in any cell other than the first cell. I've tried using .getCellRect(...) to get the x and y position of the cell to draw the rectangle but I still can't make it work.
    The code for my renderer as it stands is:
    import java.awt.Component;
    import java.awt.Graphics;
    import java.awt.Graphics2D;
    import javax.swing.JLabel;
    import javax.swing.JTable;
    import javax.swing.table.TableCellRenderer;
    public class PercentageRepresentationRenderer extends JLabel implements TableCellRenderer{
         double percentageValue;
         double rectWidth;
         double rectHeight;
         JTable table;
         int row;
         int column;
         int x;
         int y;
         public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
              if (value instanceof Number)
                   this.table = table;
                   this.row = row;
                   this.column = column;
                   Number numValue = (Number)value;
                   percentageValue = numValue.doubleValue();
                   rectHeight = table.getRowHeight(row);
                   rectWidth = percentageValue * table.getColumnModel().getColumn(column).getWidth();
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         public void paintComponent(Graphics g) {
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            y = table.getCellRect(row, column, false).y;
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            g2d.fillRect(x,y, new Double(rectWidth).intValue(), new Double(rectHeight).intValue());
            super.paintComponent(g);
    }and the following code produces a runnable example:
    import javax.swing.JFrame;
    import javax.swing.JScrollPane;
    import javax.swing.JTable;
    import javax.swing.table.DefaultTableModel;
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         public PercentageTestTable()
              Object[] columnNames = new Object[]{"A","B"};
              Object[][] tableData = new Object[][]{{0.25,0.5},{0.75,1.0}};
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              testTable.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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    Ruanae

    This is an example I published some while ago -
    import java.awt.*;
    import javax.swing.*;
    import javax.swing.table.*;
    public class Fred120 extends JPanel
        static final Object[][] tableData =
            {1, new Double(10.0)},
            {2, new Double(20.0)},
            {3, new Double(50.0)},
            {4, new Double(10.0)},
            {5, new Double(95.0)},
            {6, new Double(60.0)},
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            "One",
            "Two",
        public Fred120() throws Exception
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            final DefaultTableModel model = new DefaultTableModel(tableData, headers);
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            table.getColumnModel().getColumn(1).setCellRenderer( new LocalCellRenderer(120.0));
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            add(table.getTableHeader(), BorderLayout.NORTH);
        public class LocalCellRenderer extends DefaultTableCellRenderer
            private double v = 0.0;
            private double maxV;
            private final JPanel renderer = new JPanel(new GridLayout(1,0))
                public void paintComponent(Graphics g)
                    super.paintComponent(g);
                    g.setColor(Color.CYAN);
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                    int h = getHeight();
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    import javax.swing.border.Border;
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         item = new Hashtable();
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         public Component getTableCellRendererComponent(JTable table,
              Object value, boolean isSelected, boolean hasFocus,
              int nRow, int nCol)
              if (value instanceof String)
                   setText((String)value);
              // Adjust row's height
              int width = table.getColumnModel().getColumn(nCol).getWidth();
              setSize(width, 1000);
              int rowHeight = getPreferredSize().height;
              if (table.getRowHeight(nRow) != rowHeight)
                   table.setRowHeight(nRow, rowHeight);
              this.setBackground(Color.WHITE);
              return this;

    I think Problem is between these code only
    for(int k=0;k<columnCount;k++)
                   TableCellRenderer renderer = null;
                   TableCellEditor editor = null;
                   renderer = new TextAreaCellRenderer();
                                                                itemTable.getColumnModel().getColumn(k).setCellRenderer(renderer);or in this renderer
    class TextAreaCellRenderer extends JTextArea implements TableCellRenderer
         public TextAreaCellRenderer() {
              setEditable(false);
              setLineWrap(true);
              setWrapStyleWord(true);
         public Component getTableCellRendererComponent(JTable table,
              Object value, boolean isSelected, boolean hasFocus,
              int nRow, int nCol)
              if (value instanceof String)
                   setText((String)value);
              // Adjust row's height
              int width = table.getColumnModel().getColumn(nCol).getWidth();
              setSize(width, 1000);
              int rowHeight = getPreferredSize().height;
              if (table.getRowHeight(nRow) != rowHeight)
                   table.setRowHeight(nRow, rowHeight);
              this.setBackground(Color.WHITE);
              return this;
    }

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