import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.plaf.*;import javax.swing.JScrollPane;import javax.swing.JTable;import javax.swing.table.TableModel;import javax.swing.table.DefaultTableModel;public class LinkStart extends Frame {// import javax.swing.table.AbstractTableModel; ////Init vars int win_x = 500; //Window size X int win_y = 500; //Window size Y String[] columnNames = {"Link Postion", "Link Data"}; Object[][] data = {null};//Init items private Button addButon; private Button genButton; private Button editButton; private Button sortButton;//Init the object - The all important one! LinkControl LinkData = new LinkControl();//Init table stuff, also disable the cell edits TableModel model = new DefaultTableModel(data, columnNames); JTable table = new JTable(model){ public boolean isCellEditable(int rowIndex, int colIndex) { return false; //Disallow the editing of any cell } };public LinkStart() { //Set frame title and size super("Linked List GUI"); setSize(win_x, win_y); //Listeners addWindowListener( new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } } ); final ActionListener buttonListener = new ActionListener() { public void actionPerformed(ActionEvent ae) { String action = ae.getActionCommand(); if (action.equals("Add")) { LinkData.add(); } else if (action.equals("Generate")){ LinkData.gen(); } else if (action.equals("Edit")){ LinkData.edit(table); } else if (action.equals("Sort")){ LinkData.sort(); } else { System.out.println(action); } } }; //Set toolbars Panel controlPanel = new Panel(); Panel tablePanel = new Panel(); //Create buttons JButton addButton = new JButton("Add"); JButton genButton = new JButton("Generate"); JButton editButton = new JButton("Edit"); JButton sortButton = new JButton("Sort"); //Add buttons to the buttonListener addButton.addActionListener(buttonListener); genButton.addActionListener(buttonListener); editButton.addActionListener(buttonListener); sortButton.addActionListener(buttonListener); //Set tool tips for some simple help addButton.setToolTipText("Add to linked list"); genButton.setToolTipText("Generate a new list"); editButton.setToolTipText("Edit selected row"); sortButton.setToolTipText("Sort by"); //Add Items to panel and add panel controlPanel.add(addButton); controlPanel.add(genButton); controlPanel.add(editButton); controlPanel.add(sortButton); add(controlPanel, BorderLayout.SOUTH); JScrollPane scrollPane = new JScrollPane(table); table.setFillsViewportHeight(true); tablePanel.add(scrollPane); add(tablePanel, BorderLayout.CENTER); }public static void main(String Args[]) { LinkStart LinkFrame = new LinkStart(); LinkFrame.setVisible(true); }}import java.util.LinkedList;import java.util.Iterator;import java.util.ListIterator;import javax.swing.JTable;import java.util.Random;import javax.swing.table.TableModel;class LinkControl{LinkedList LinkObject = new LinkedList();Iterator iterator;int i;public LinkControl() { System.out.println("Link control() works"); }void add() { System.out.println("Link control.add() works"); }void gen() { System.out.println("Link control.gen() works"); //We must set the first and last entrys before we add anything else, otherwise the java program throws a fit LinkObject.addFirst(randomData()); LinkObject.addLast(randomData()); //loop through and add 10 more entrys for (i = 1; i<=10; i ++){ LinkObject.add(i,randomData()); } // purely for debuging, just to check the list iterator = LinkObject.iterator(); while (iterator.hasNext()){ System.out.println(iterator.next()+" "); //System.out.println(iterator.nextIndex()+" "); } }void edit(JTable table) { System.out.println("Link control.edit() works"); System.out.println(table.getValueAt(getFocusRow(table), 0)); }void sort() { System.out.println("Link control.sort() works"); }public static int getFocusRow(JTable table) { return table.getSelectionModel().getLeadSelectionIndex(); //System.out.println(table.getSelectionModel().getLeadSelectionIndex()); } public static int getFocusColumn(JTable table) { return table.getColumnModel().getSelectionModel().getLeadSelectionIndex(); }public static long randomData(){ Random rand = new Random(); return rand.nextLong(); }}