JTree的简单例子

java 代码

package example;

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;

public class SimpleTree extends JFrame {

      JTree tree;
      DefaultTreeModel treeModel;

      public SimpleTree( ) {
        super("Tree Test Example");
        setSize(400, 300);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
      }

      public void init( ) {
        // Build up a bunch of TreeNodes. We use DefaultMutableTreeNode because the
        // DefaultTreeModel can use it to build a complete tree.
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
        DefaultMutableTreeNode subroot = new DefaultMutableTreeNode("SubRoot");
        DefaultMutableTreeNode leaf1 = new DefaultMutableTreeNode("Leaf 1");
        DefaultMutableTreeNode leaf2 = new DefaultMutableTreeNode("Leaf 2");

        // Build our tree model starting at the root node, and then make a JTree out
        // of it.
        treeModel = new DefaultTreeModel(root);
        tree = new JTree(treeModel);

        // Build the tree up from the nodes we created.
        treeModel.insertNodeInto(subroot, root, 0);
        // Or, more succinctly:
        subroot.add(leaf1);
        root.add(leaf2);

        // Display it.
        getContentPane( ).add(tree, BorderLayout.CENTER);

        final JLabel messageLabel = new JLabel("Nothing selected.");
        add(messageLabel, BorderLayout.SOUTH);

//    Add our selection listener and have it report to
        // our messageLabel.
        tree.addTreeSelectionListener(new TreeSelectionListener( ) {
          public void valueChanged(TreeSelectionEvent tse) {
            TreePath tp = tse.getNewLeadSelectionPath( );
            messageLabel.setText("Selected: " + tp.getLastPathComponent( ));
          }
        });


      }

      public static void main(String args[]) {
        SimpleTree tt = new SimpleTree( );
        tt.init( );
        tt.setVisible(true);
      }
    }

评论

1 楼 zhengchao860730 2010-10-12  

为什么没有任何注释.....  也没说明... 最近比较关注这个东西!