jtree

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     基本上要改变树的节点的显示方式就是实现TreeCellRenderer,如果要改变编辑的方式就要实现               TreeCellEditor,实现方法和TreeCellRenderer非常相似.
     public class TagCheckRenderer extends JCheckBox implements TreeCellRenderer{



          public Component getTreeCellRendererComponent(JTree tree,
                                                    Object value,
                                                    boolean selected,
                                                    boolean expanded,
                                                    boolean leaf,
                                                    int row,
                                                   boolean hasFocus){


                 String stringValue = tree.convertValueToText(value, selected,
                          expanded, leaf, row, hasFocus);

                  TagCheckNode node = (TagCheckNode)value;
                  if(!node.isEditable()){
                          JLabel label = new JLabel(stringValue);
                          label.setComponentOrientation(tree.getComponentOrientation());
                         if(hasFocus||node.isSelected()){

                                 label.setBackground(UIManager.getColor("Tree.selectionBackground"

);
                          }
                         else{

                                 label.setBackground(tree.getBackground());
                          }
                          return label;
                  }
                  this.setText(stringValue);

                 if(!leaf){

                          this.setEnabled(false);
                          this.setSelected(false);
                          TagCheckNode child = null;
                          //只要有一个叶子子节点Tag被选中，该节点就为被选中的状态
                         for(Enumeration enum = node.children(); enum.hasMoreElements()

{

                                  child = (TagCheckNode)enum.nextElement();
                                 if(child.isLeaf()&&child.isSelected()){

                                          this.setSelected(true);
                                          break;
                                  }
                          }
                  }
                 else{

                          this.setSelected(node.isSelected());
                          this.setEnabled(tree.isEnabled());
                  }

                 if(hasFocus){

                          this.setBackground(UIManager.getColor("Tree.selectionBackground"

);
                  }
                 else{

                          this.setBackground(tree.getBackground());
                  }
                  this.setComponentOrientation(tree.getComponentOrientation());
                  return this;
          }
  }