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Swing / AWT / SWT
Right Align numbers in Jtable
Smriti Anchu
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Posts: 40
posted 19 years ago
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Hi,
I have a JTable. I want to right align only one column that too from second row in the table. How do i do it
Do tell me as early as possible
regards
smriti
Michael Dunn
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posted 19 years ago
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set your own renderer (extending DefaultTableCellRenderer)
use the 'row' parameter of getTableCellRendererComponent() to setHorizontalAlignment(JLabel.RIGHT);
Smriti Anchu
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posted 19 years ago
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Hi,
I am new to Swings. I wanna know what is a renderer, why is it needed. Could you please send me the code for the same.
thanks in advance
smriti
Anand Karia
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Posts: 158
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posted 19 years ago
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In simple language, you convert table column to your own created name and then change the default property to your required properties or etc.
Smriti, I hope this would help you out.
import javax.swing.DefaultCellEditor; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.table.AbstractTableModel; import javax.swing.table.DefaultTableCellRenderer; import javax.swing.table.TableCellRenderer; import javax.swing.table.TableColumn; import java.awt.Component; import java.awt.Dimension; import java.awt.GridLayout; /** * TableRenderDemo is just like TableDemo, except that it * explicitly initializes column sizes and it uses a combo box * as an editor for the Sport column. */ public class TableRenderDemo extends JPanel { private boolean DEBUG = false; public TableRenderDemo() { super(new GridLayout(1,0)); JTable table = new JTable(new MyTableModel()); table.setPreferredScrollableViewportSize(new Dimension(500, 70)); //Create the scroll pane and add the table to it. JScrollPane scrollPane = new JScrollPane(table); //Set up column sizes. initColumnSizes(table); //Fiddle with the Sport column's cell editors/renderers. setUpSportColumn(table, table.getColumnModel().getColumn(2)); //Add the scroll pane to this panel. add(scrollPane); } /* * This method picks good column sizes. * If all column heads are wider than the column's cells' * contents, then you can just use column.sizeWidthToFit(). */ private void initColumnSizes(JTable table) { MyTableModel model = (MyTableModel)table.getModel(); TableColumn column = null; Component comp = null; int headerWidth = 0; int cellWidth = 0; Object[] longValues = model.longValues; TableCellRenderer headerRenderer = table.getTableHeader().getDefaultRenderer(); for (int i = 0; i < 5; i++) { column = table.getColumnModel().getColumn(i); comp = headerRenderer.getTableCellRendererComponent( null, column.getHeaderValue(), false, false, 0, 0); headerWidth = comp.getPreferredSize().width; comp = table.getDefaultRenderer(model.getColumnClass(i)). getTableCellRendererComponent( table, longValues[i], false, false, 0, i); cellWidth = comp.getPreferredSize().width; if (DEBUG) { System.out.println("Initializing width of column " + i + ". " + "headerWidth = " + headerWidth + "; cellWidth = " + cellWidth); } //XXX: Before Swing 1.1 Beta 2, use setMinWidth instead. column.setPreferredWidth(Math.max(headerWidth, cellWidth)); } } public void setUpSportColumn(JTable table, TableColumn sportColumn) { //Set up the editor for the sport cells. JComboBox comboBox = new JComboBox(); comboBox.addItem("Snowboarding"); comboBox.addItem("Rowing"); comboBox.addItem("Knitting"); comboBox.addItem("Speed reading"); comboBox.addItem("Pool"); comboBox.addItem("None of the above"); sportColumn.setCellEditor(new DefaultCellEditor(comboBox)); //Set up tool tips for the sport cells. DefaultTableCellRenderer renderer = new DefaultTableCellRenderer(); renderer.setToolTipText("Click for combo box"); sportColumn.setCellRenderer(renderer); } class MyTableModel extends AbstractTableModel { private String[] columnNames = {"First Name", "Last Name", "Sport", "# of Years", "Vegetarian"}; private Object[][] data = { {"Mary", "Campione", "Snowboarding", new Integer(5), new Boolean(false)}, {"Alison", "Huml", "Rowing", new Integer(3), new Boolean(true)}, {"Kathy", "Walrath", "Knitting", new Integer(2), new Boolean(false)}, {"Sharon", "Zakhour", "Speed reading", new Integer(20), new Boolean(true)}, {"Philip", "Milne", "Pool", new Integer(10), new Boolean(false)} }; public final Object[] longValues = {"Sharon", "Campione", "None of the above", new Integer(20), Boolean.TRUE}; public int getColumnCount() { return columnNames.length; } public int getRowCount() { return data.length; } public String getColumnName(int col) { return columnNames[col]; } public Object getValueAt(int row, int col) { return data[row][col]; } /* * JTable uses this method to determine the default renderer/ * editor for each cell. If we didn't implement this method, * then the last column would contain text ("true"/"false"), * rather than a check box. */ public Class getColumnClass(int c) { return getValueAt(0, c).getClass(); } /* * Don't need to implement this method unless your table's * editable. */ public boolean isCellEditable(int row, int col) { //Note that the data/cell address is constant, //no matter where the cell appears onscreen. if (col < 2) { return false; } else { 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) { if (DEBUG) { System.out.println("Setting value at " + row + "," + col + " to " + value + " (an instance of " + value.getClass() + ")"); } data[row][col] = value; fireTableCellUpdated(row, col); if (DEBUG) { System.out.println("New value of data:"); printDebugData(); } } private void printDebugData() { int numRows = getRowCount(); int numCols = getColumnCount(); for (int i=0; i < numRows; i++) { System.out.print(" row " + i + ":"); for (int j=0; j < numCols; j++) { System.out.print(" " + data[i][j]); } System.out.println(); } System.out.println("--------------------------"); } } /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event-dispatching thread. */ private static void createAndShowGUI() { //Make sure we have nice window decorations. JFrame.setDefaultLookAndFeelDecorated(true); //Create and set up the window. JFrame frame = new JFrame("TableRenderDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. TableRenderDemo newContentPane = new TableRenderDemo(); newContentPane.setOpaque(true); //content panes must be opaque frame.setContentPane(newContentPane); //Display the window. frame.pack(); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } }
Love is GOD and GOD is Love.
Anand Karia
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M/s. Anand Karia Concreting IT
Michael Dunn
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posted 19 years ago
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if you're new to swing, read this first - before asking for people to provide
code for you.
http://java.sun.com/docs/books/tutorial/uiswing/components/table.html
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