java swing jtree简单界面使用

import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeSelectionModel;

public class Tree extends JFrame
{
/**
*
*/
private static final long serialVersionUID = 1L;
JTree tree = new JTree();

private void setTree() {
// TODO Auto-generated method stub
DefaultMutableTreeNode root = null;
DefaultMutableTreeNode  leaf1,leaf2;
root = new DefaultMutableTreeNode("work");

DefaultMutableTreeNode nodeppt=new DefaultMutableTreeNode("ppt");
root.add(nodeppt);
leaf1=new  DefaultMutableTreeNode("6_10.ppt");
leaf2=new  DefaultMutableTreeNode("6_10.vsd");
nodeppt.add(leaf1);
nodeppt.add(leaf2);
tree.getSelectionModel().setSelectionMode( TreeSelectionModel.SINGLE_TREE_SELECTION );
tree.setShowsRootHandles( true );
//树不可以编辑
tree.setEditable( false );
tree.setModel(new DefaultTreeModel(root));
getContentPane().add(tree);
}

public static void main(String[] args)
{
Tree t = new Tree();
t.setSize(300,300);
t.setTree();
t.show();
}

}

tree.getSelectionModel().setSelectionMode( TreeSelectionModel.SINGLE_TREE_SELECTION );

tree.setShowsRootHandles( true );