怎样让JTree中的每一个结点变成一个JCheckBox，而不是原来的文件夹和文件的模样？

我告诉你大体的框架
class MyCheckBoxTree extends JCheckBox implements TreeCellRenderer {
    Border e = new EmptyBorder(1, 1, 1, 1);

    public MyCheckBoxTree() {
        super();
        setOpaque(true);
        setBorder(e);
    }

    public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
        setText(value.toString());
        //this.setBackground(selectesm a  d?tree.getSelectionPath():tree.getBackground());
        //this.setForeground(selected?tree.getForeground());
        setBackground(selected && !hasFocus ?
                tree.getBackground() : tree.getBackground());
        setForeground(selected && !hasFocus ?
                tree.getForeground(): tree.getForeground());
        if (value instanceof Boolean) {
            Boolean b = (Boolean) value;
            setSelected(b.booleanValue());
        }
        setFont(tree.getFont());
        setBorder(hasFocus ? UIManager.getBorder(
                "Table.focusCellHighlightBorder") : e);
        //this.setFont(tree.getFont());


        return this;
    }

}