java JTree JCheckBox树复选框详解

public class CheckTreeManager extends MouseAdapter implements TreeSelectionListener {    private CheckTreeSelectionModel selectionModel = null;   // private JTree tree = new JTree();   private JTree tree = null;     int hotspot = new JCheckBox().getPreferredSize().width;     public CheckTreeManager(JTree tree)   {    this.tree = tree;    selectionModel = new CheckTreeSelectionModel(tree.getModel());    tree.setCellRenderer(new CheckTreeCellRenderer(tree.getCellRenderer(), selectionModel));    tree.addMouseListener(this); //鼠标监听    selectionModel.addTreeSelectionListener(this); //树选择监听   }     public void mouseClicked(MouseEvent me)   {    TreePath path = tree.getPathForLocation(me.getX(), me.getY());    if(path==null)     return;    if(me.getX()>tree.getPathBounds(path).x+hotspot)     return;       boolean selected = selectionModel.isPathSelected(path, true);    selectionModel.removeTreeSelectionListener(this);       try    {     if(selected)      selectionModel.removeSelectionPath(path);     else      selectionModel.addSelectionPath(path);    }    finally    {     selectionModel.addTreeSelectionListener(this);     tree.treeDidChange();    }   }     public CheckTreeSelectionModel getSelectionModel()   {    return selectionModel;   }     public void valueChanged(TreeSelectionEvent e)   {    tree.treeDidChange();   }   }