Java by API/javax.swing/ListSelectionModel

ListSelectionModel: getMaxSelectionIndex()

  

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
class SharedListSelectionHandler implements ListSelectionListener {
  public void valueChanged(ListSelectionEvent e) {
    ListSelectionModel lsm = (ListSelectionModel) e.getSource();
    int firstIndex = e.getFirstIndex();
    int lastIndex = e.getLastIndex();
    boolean isAdjusting = e.getValueIsAdjusting();
    System.out.println("Event for indexes " + firstIndex + " - " + lastIndex + "; isAdjusting is "
        + isAdjusting + "; selected indexes:");
    if (lsm.isSelectionEmpty()) {
      System.out.println(" <none>");
    } else {
      // Find out which indexes are selected.
      int minIndex = lsm.getMinSelectionIndex();
      int maxIndex = lsm.getMaxSelectionIndex();
      for (int i = minIndex; i <= maxIndex; i++) {
        if (lsm.isSelectedIndex(i)) {
          System.out.println(" " + i);
        }
      }
    }
  }
}
public class Main {
  static String labels[] = { "A", "B", "C", "D", "E", "F", "G" };
  public static void main(String args[]) {
    JFrame frame = new JFrame("Modifying Model");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    String[] columnNames = { "French", "Spanish", "Italian" };
    String[][] tableData = { { "un", "uno", "uno" }, { "deux", "dos", "due" },
        { "trois", "tres", "tre" }, { "quatre", "cuatro", "quattro" },
        { "cinq", "cinco", "cinque" }, { "six", "seis", "sei" }, { "sept", "siete", "sette" } };
    JTable table = new JTable(tableData, columnNames);
    table.getSelectionModel().addListSelectionListener(new SharedListSelectionHandler());
    JScrollPane scrollPane1 = new JScrollPane(table);
    frame.add(scrollPane1, BorderLayout.CENTER);
    frame.setSize(640, 300);
    frame.setVisible(true);
  }
}

ListSelectionModel: getMinSelectionIndex()

  
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;
public class MainClass extends JFrame {
  public MainClass() {
    super("Selection Model Test");
    setSize(450, 350);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    TableModel tm = new AbstractTableModel() {
      public int getRowCount() {
        return 10;
      }
      public int getColumnCount() {
        return 10;
      }
      public Object getValueAt(int r, int c) {
        return "0";
      }
    };
    final JTable jt = new JTable(tm);
    JScrollPane jsp = new JScrollPane(jt);
    getContentPane().add(jsp, BorderLayout.CENTER);
    JPanel controlPanel, buttonPanel, columnPanel, rowPanel;
    buttonPanel = new JPanel();
    final JCheckBox cellBox, columnBox, rowBox;
    cellBox = new JCheckBox("Cells", jt.getCellSelectionEnabled());
    columnBox = new JCheckBox("Columns", jt.getColumnSelectionAllowed());
    rowBox = new JCheckBox("Rows", jt.getRowSelectionAllowed());
    
    cellBox.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        jt.setCellSelectionEnabled(cellBox.isSelected());
        columnBox.setSelected(jt.getColumnSelectionAllowed());
        rowBox.setSelected(jt.getRowSelectionAllowed());
      }
    });
    columnBox.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        jt.setColumnSelectionAllowed(columnBox.isSelected());
        cellBox.setSelected(jt.getCellSelectionEnabled());
      }
    });
    rowBox.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        jt.setRowSelectionAllowed(rowBox.isSelected());
        cellBox.setSelected(jt.getCellSelectionEnabled());
      }
    });
    buttonPanel.add(new JLabel("Selections allowed:"));
    buttonPanel.add(cellBox);
    buttonPanel.add(columnBox);
    buttonPanel.add(rowBox);
    columnPanel = new JPanel();
    ListSelectionModel csm = jt.getColumnModel().getSelectionModel();
    JLabel columnCounter = new JLabel("Selected Column Indices:");
    csm.addListSelectionListener(new SelectionDebugger(columnCounter, csm));
    columnPanel.add(new JLabel("Selected columns:"));
    columnPanel.add(columnCounter);
    rowPanel = new JPanel();
    ListSelectionModel rsm = jt.getSelectionModel();
    JLabel rowCounter = new JLabel("Selected Row Indices:");
    rsm.addListSelectionListener(new SelectionDebugger(rowCounter, rsm));
    rowPanel.add(new JLabel("Selected rows:"));
    rowPanel.add(rowCounter);
    controlPanel = new JPanel(new GridLayout(0, 1));
    controlPanel.add(buttonPanel);
    controlPanel.add(columnPanel);
    controlPanel.add(rowPanel);
    getContentPane().add(controlPanel, BorderLayout.SOUTH);
  }
  public static void main(String args[]) {
    MainClass se = new MainClass();
    se.setVisible(true);
  }
  public class SelectionDebugger implements ListSelectionListener {
    JLabel debugger;
    ListSelectionModel model;
    public SelectionDebugger(JLabel target, ListSelectionModel lsm) {
      debugger = target;
      model = lsm;
    }
    public void valueChanged(ListSelectionEvent lse) {
      if (!lse.getValueIsAdjusting()) {
        StringBuffer buf = new StringBuffer();
        int[] selection = getSelectedIndices(model.getMinSelectionIndex(), model
            .getMaxSelectionIndex());
        if (selection.length == 0) {
          buf.append("none");
        } else {
          for (int i = 0; i < selection.length - 1; i++) {
            buf.append(selection[i]);
            buf.append(", ");
          }
          buf.append(selection[selection.length - 1]);
        }
        debugger.setText(buf.toString());
      }
    }
    protected int[] getSelectedIndices(int start, int stop) {
      if ((start == -1) || (stop == -1)) {
        return new int[0];
      }
      int guesses[] = new int[stop - start + 1];
      int index = 0;
      for (int i = start; i <= stop; i++) {
        if (model.isSelectedIndex(i)) {
          guesses[index++] = i;
        }
      }
      int realthing[] = new int[index];
      System.arraycopy(guesses, 0, realthing, 0, index);
      return realthing;
    }
  }
}

ListSelectionModel: isSelectedIndex(int index)

  

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
class SharedListSelectionHandler implements ListSelectionListener {
  public void valueChanged(ListSelectionEvent e) {
    ListSelectionModel lsm = (ListSelectionModel) e.getSource();
    int firstIndex = e.getFirstIndex();
    int lastIndex = e.getLastIndex();
    boolean isAdjusting = e.getValueIsAdjusting();
    System.out.println("Event for indexes " + firstIndex + " - " + lastIndex + "; isAdjusting is "
        + isAdjusting + "; selected indexes:");
    if (lsm.isSelectionEmpty()) {
      System.out.println(" <none>");
    } else {
      // Find out which indexes are selected.
      int minIndex = lsm.getMinSelectionIndex();
      int maxIndex = lsm.getMaxSelectionIndex();
      for (int i = minIndex; i <= maxIndex; i++) {
        if (lsm.isSelectedIndex(i)) {
          System.out.println(" " + i);
        }
      }
    }
  }
}
public class Main {
  static String labels[] = { "A", "B", "C", "D", "E", "F", "G" };
  public static void main(String args[]) {
    JFrame frame = new JFrame("Modifying Model");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    String[] columnNames = { "French", "Spanish", "Italian" };
    String[][] tableData = { { "un", "uno", "uno" }, { "deux", "dos", "due" },
        { "trois", "tres", "tre" }, { "quatre", "cuatro", "quattro" },
        { "cinq", "cinco", "cinque" }, { "six", "seis", "sei" }, { "sept", "siete", "sette" } };
    JTable table = new JTable(tableData, columnNames);
    table.getSelectionModel().addListSelectionListener(new SharedListSelectionHandler());
    JScrollPane scrollPane1 = new JScrollPane(table);
    frame.add(scrollPane1, BorderLayout.CENTER);
    frame.setSize(640, 300);
    frame.setVisible(true);
  }
}

ListSelectionModel: isSelectionEmpty()

  

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
class SharedListSelectionHandler implements ListSelectionListener {
  public void valueChanged(ListSelectionEvent e) {
    ListSelectionModel lsm = (ListSelectionModel) e.getSource();
    int firstIndex = e.getFirstIndex();
    int lastIndex = e.getLastIndex();
    boolean isAdjusting = e.getValueIsAdjusting();
    System.out.println("Event for indexes " + firstIndex + " - " + lastIndex + "; isAdjusting is "
        + isAdjusting + "; selected indexes:");
    if (lsm.isSelectionEmpty()) {
      System.out.println(" <none>");
    } else {
      // Find out which indexes are selected.
      int minIndex = lsm.getMinSelectionIndex();
      int maxIndex = lsm.getMaxSelectionIndex();
      for (int i = minIndex; i <= maxIndex; i++) {
        if (lsm.isSelectedIndex(i)) {
          System.out.println(" " + i);
        }
      }
    }
  }
}
public class Main {
  static String labels[] = { "A", "B", "C", "D", "E", "F", "G" };
  public static void main(String args[]) {
    JFrame frame = new JFrame("Modifying Model");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    String[] columnNames = { "French", "Spanish", "Italian" };
    String[][] tableData = { { "un", "uno", "uno" }, { "deux", "dos", "due" },
        { "trois", "tres", "tre" }, { "quatre", "cuatro", "quattro" },
        { "cinq", "cinco", "cinque" }, { "six", "seis", "sei" }, { "sept", "siete", "sette" } };
    JTable table = new JTable(tableData, columnNames);
    table.getSelectionModel().addListSelectionListener(new SharedListSelectionHandler());
    JScrollPane scrollPane1 = new JScrollPane(table);
    frame.add(scrollPane1, BorderLayout.CENTER);
    frame.setSize(640, 300);
    frame.setVisible(true);
  }
}

ListSelectionModel: setAnchorSelectionIndex(int index)

  
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
public class Main {
  static String labels[] = { "A", "B", "C", "D", "E", "F", "G" };
  public static void main(String args[]) {
    JFrame frame = new JFrame("Modifying Model");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JList jlist = new JList(new String[]{"A","B","C"});
    
    jlist.getSelectionModel().setAnchorSelectionIndex(0);   
    jlist.getSelectionModel().setLeadSelectionIndex(2);
    
    
    JScrollPane scrollPane1 = new JScrollPane(jlist);
    frame.add(scrollPane1, BorderLayout.CENTER);
    frame.setSize(640, 300);
    frame.setVisible(true);
  }
}

ListSelectionModel: setLeadSelectionIndex(int index)

  
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
public class Main {
  static String labels[] = { "A", "B", "C", "D", "E", "F", "G" };
  public static void main(String args[]) {
    JFrame frame = new JFrame("Modifying Model");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JList jlist = new JList(new String[]{"A","B","C"});
    
    jlist.getSelectionModel().setAnchorSelectionIndex(0);   
    jlist.getSelectionModel().setLeadSelectionIndex(2);
    
    
    JScrollPane scrollPane1 = new JScrollPane(jlist);
    frame.add(scrollPane1, BorderLayout.CENTER);
    frame.setSize(640, 300);
    frame.setVisible(true);
  }
}

ListSelectionModel.SINGLE_INTERVAL_SELECTION

  

/*
 * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Sun Microsystems nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/*
 * ListDataEventDemo.java requires the Java Look and Feel Graphics
 * Repository (jlfgr-1_0.jar).  You can download this file from
 * http://java.sun.ru/developer/techDocs/hi/repository/
 * Put it in the class path using one of the following commands
 * (assuming jlfgr-1_0.jar is in a subdirectory named jars):
 *
 *   java -cp .;jars/jlfgr-1_0.jar ListDataEventDemo [Microsoft Windows]
 *   java -cp .:jars/jlfgr-1_0.jar ListDataEventDemo [UNIX]
 */
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.DefaultListModel;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListDataEvent;
import javax.swing.event.ListDataListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
public class Main extends JPanel implements ListSelectionListener {
  private JList list;
  private DefaultListModel listModel;
  private static final String addString = "Add";
  private static final String deleteString = "Delete";
  private static final String upString = "Move up";
  private static final String downString = "Move down";
  private JButton addButton;
  private JButton deleteButton;
  private JButton upButton;
  private JButton downButton;
  private JTextField nameField;
  private JTextArea log;
  static private String newline = "\n";
  public Main() {
    super(new BorderLayout());
    // Create and populate the list model.
    listModel = new DefaultListModel();
    listModel.addElement("Whistler, Canada");
    listModel.addElement("Jackson Hole, Wyoming");
    listModel.addElement("Squaw Valley, California");
    listModel.addElement("Telluride, Colorado");
    listModel.addElement("Taos, New Mexico");
    listModel.addElement("Snowbird, Utah");
    listModel.addElement("Chamonix, France");
    listModel.addElement("Banff, Canada");
    listModel.addElement("Arapahoe Basin, Colorado");
    listModel.addElement("Kirkwood, California");
    listModel.addElement("Sun Valley, Idaho");
    listModel.addListDataListener(new MyListDataListener());
    // Create the list and put it in a scroll pane.
    list = new JList(listModel);
    list.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
    list.setSelectedIndex(0);
    list.addListSelectionListener(this);
    JScrollPane listScrollPane = new JScrollPane(list);
    // Create the list-modifying buttons.
    addButton = new JButton(addString);
    addButton.setActionCommand(addString);
    addButton.addActionListener(new AddButtonListener());
    deleteButton = new JButton(deleteString);
    deleteButton.setActionCommand(deleteString);
    deleteButton.addActionListener(new DeleteButtonListener());
    ImageIcon icon = createImageIcon("Up16");
    if (icon != null) {
      upButton = new JButton(icon);
      upButton.setMargin(new Insets(0, 0, 0, 0));
    } else {
      upButton = new JButton("Move up");
    }
    upButton.setToolTipText("Move the currently selected list item higher.");
    upButton.setActionCommand(upString);
    upButton.addActionListener(new UpDownListener());
    icon = createImageIcon("Down16");
    if (icon != null) {
      downButton = new JButton(icon);
      downButton.setMargin(new Insets(0, 0, 0, 0));
    } else {
      downButton = new JButton("Move down");
    }
    downButton.setToolTipText("Move the currently selected list item lower.");
    downButton.setActionCommand(downString);
    downButton.addActionListener(new UpDownListener());
    JPanel upDownPanel = new JPanel(new GridLayout(2, 1));
    upDownPanel.add(upButton);
    upDownPanel.add(downButton);
    // Create the text field for entering new names.
    nameField = new JTextField(15);
    nameField.addActionListener(new AddButtonListener());
    String name = listModel.getElementAt(list.getSelectedIndex()).toString();
    nameField.setText(name);
    // Create a control panel, using the default FlowLayout.
    JPanel buttonPane = new JPanel();
    buttonPane.add(nameField);
    buttonPane.add(addButton);
    buttonPane.add(deleteButton);
    buttonPane.add(upDownPanel);
    // Create the log for reporting list data events.
    log = new JTextArea(10, 20);
    JScrollPane logScrollPane = new JScrollPane(log);
    // Create a split pane for the log and the list.
    JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT,
        listScrollPane, logScrollPane);
    splitPane.setResizeWeight(0.5);
    // Put everything together.
    add(buttonPane, BorderLayout.PAGE_START);
    add(splitPane, BorderLayout.CENTER);
  }
  class MyListDataListener implements ListDataListener {
    public void contentsChanged(ListDataEvent e) {
      log.append("contentsChanged: " + e.getIndex0() + ", " + e.getIndex1()
          + newline);
      log.setCaretPosition(log.getDocument().getLength());
    }
    public void intervalAdded(ListDataEvent e) {
      log.append("intervalAdded: " + e.getIndex0() + ", " + e.getIndex1()
          + newline);
      log.setCaretPosition(log.getDocument().getLength());
    }
    public void intervalRemoved(ListDataEvent e) {
      log.append("intervalRemoved: " + e.getIndex0() + ", " + e.getIndex1()
          + newline);
      log.setCaretPosition(log.getDocument().getLength());
    }
  }
  class DeleteButtonListener implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      /*
       * This method can be called only if there"s a valid selection, so go
       * ahead and remove whatever"s selected.
       */
      ListSelectionModel lsm = list.getSelectionModel();
      int firstSelected = lsm.getMinSelectionIndex();
      int lastSelected = lsm.getMaxSelectionIndex();
      listModel.removeRange(firstSelected, lastSelected);
      int size = listModel.size();
      if (size == 0) {
        // List is empty: disable delete, up, and down buttons.
        deleteButton.setEnabled(false);
        upButton.setEnabled(false);
        downButton.setEnabled(false);
      } else {
        // Adjust the selection.
        if (firstSelected == listModel.getSize()) {
          // Removed item in last position.
          firstSelected--;
        }
        list.setSelectedIndex(firstSelected);
      }
    }
  }
  /** A listener shared by the text field and add button. */
  class AddButtonListener implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      if (nameField.getText().equals("")) {
        // User didn"t type in a name...
        Toolkit.getDefaultToolkit().beep();
        return;
      }
      int index = list.getSelectedIndex();
      int size = listModel.getSize();
      // If no selection or if item in last position is selected,
      // add the new one to end of list, and select new one.
      if (index == -1 || (index + 1 == size)) {
        listModel.addElement(nameField.getText());
        list.setSelectedIndex(size);
        // Otherwise insert the new one after the current selection,
        // and select new one.
      } else {
        listModel.insertElementAt(nameField.getText(), index + 1);
        list.setSelectedIndex(index + 1);
      }
    }
  }
  // Listen for clicks on the up and down arrow buttons.
  class UpDownListener implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      // This method can be called only when
      // there"s a valid selection,
      // so go ahead and move the list item.
      int moveMe = list.getSelectedIndex();
      if (e.getActionCommand().equals(upString)) {
        // UP ARROW BUTTON
        if (moveMe != 0) {
          // not already at top
          swap(moveMe, moveMe - 1);
          list.setSelectedIndex(moveMe - 1);
          list.ensureIndexIsVisible(moveMe - 1);
        }
      } else {
        // DOWN ARROW BUTTON
        if (moveMe != listModel.getSize() - 1) {
          // not already at bottom
          swap(moveMe, moveMe + 1);
          list.setSelectedIndex(moveMe + 1);
          list.ensureIndexIsVisible(moveMe + 1);
        }
      }
    }
  }
  // Swap two elements in the list.
  private void swap(int a, int b) {
    Object aObject = listModel.getElementAt(a);
    Object bObject = listModel.getElementAt(b);
    listModel.set(a, bObject);
    listModel.set(b, aObject);
  }
  // Listener method for list selection changes.
  public void valueChanged(ListSelectionEvent e) {
    if (e.getValueIsAdjusting() == false) {
      if (list.getSelectedIndex() == -1) {
        // No selection: disable delete, up, and down buttons.
        deleteButton.setEnabled(false);
        upButton.setEnabled(false);
        downButton.setEnabled(false);
        nameField.setText("");
      } else if (list.getSelectedIndices().length > 1) {
        // Multiple selection: disable up and down buttons.
        deleteButton.setEnabled(true);
        upButton.setEnabled(false);
        downButton.setEnabled(false);
      } else {
        // Single selection: permit all operations.
        deleteButton.setEnabled(true);
        upButton.setEnabled(true);
        downButton.setEnabled(true);
        nameField.setText(list.getSelectedValue().toString());
      }
    }
  }
  /** Returns an ImageIcon, or null if the path was invalid. */
  protected static ImageIcon createImageIcon(String imageName) {
    String imgLocation = "toolbarButtonGraphics/navigation/" + imageName
        + ".gif";
    java.net.URL imageURL = Main.class.getResource(imgLocation);
    if (imageURL == null) {
      System.err.println("Resource not found: " + imgLocation);
      return null;
    } else {
      return new ImageIcon(imageURL);
    }
  }
  /**
   * Create the GUI and show it. For thread safety, this method should be
   * invoked from the event-dispatching thread.
   */
  private static void createAndShowGUI() {
    // Create and set up the window.
    JFrame frame = new JFrame("ListDataEventDemo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    // Create and set up the content pane.
    JComponent newContentPane = new Main();
    newContentPane.setOpaque(true); // content panes must be opaque
    frame.setContentPane(newContentPane);
    // Don"t let the content pane get too small.
    // (Works if the Java look and feel provides
    // the window decorations.)
    newContentPane.setMinimumSize(new Dimension(newContentPane
        .getPreferredSize().width, 100));
    // 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();
      }
    });
  }
}

ListSelectionModel.SINGLE_SELECTION

  
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;
public class MainClass {
  public static void main(final String args[]) {
    final Object rows[][] = { { "one", "1" }, { "two", "2" },
        { "three", "3" } };
    final String headers[] = { "English", "Digit" };
    
    TableModel fixedColumnModel = new AbstractTableModel() {
      public int getColumnCount() {
        return 2;
      }
      public String getColumnName(int column) {
        return headers[column];
      }
      public int getRowCount() {
        return 3;
      }
      public Object getValueAt(int row, int column) {
        return rows[row][column];
      }
    };
    
    
    
    JFrame frame = new JFrame("Scrollless Table");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JTable table = new JTable(fixedColumnModel);
    
    table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    
    frame.add(new JScrollPane(table), BorderLayout.CENTER);
    frame.setSize(300, 150);
    frame.setVisible(true);
  }
}