Java Swing Tree API

 1. Java Swing Tree API

package com.home.swing;

import javax.swing.*;
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 JSTree {

    public JTree ctrl;

    public JSTree(String rootName, Runnable handler) {
        DefaultMutableTreeNode root = new DefaultMutableTreeNode(rootName);
        /* root.add( new DefaultMutableTreeNode("하위1") );
        root.add( new DefaultMutableTreeNode("하위2") ); */
        ctrl = new JTree(root);
        if( handler != null ) {
            setTreeHandler(handler);
        }
    }
    public void showTreeRoot() {
        ctrl.setRootVisible(true);}
    public void hideTreeRoot() {
        ctrl.setRootVisible(false);}

    public void setTreeHandler(Runnable runnable) {
        ctrl.getSelectionModel().addTreeSelectionListener(new TreeSelectionListener(){
            public void valueChanged(TreeSelectionEvent event) {
                runnable.run();
            }
        });
    }
    public String getTreeSelectionPath() {
        return ctrl.getSelectionModel().getSelectionPath().toString();
    }
    public void addTreeToRoot(String name) {
        DefaultTreeModel model = (DefaultTreeModel) ctrl.getModel();
        DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
        DefaultMutableTreeNode node = new DefaultMutableTreeNode(name);
        model.insertNodeInto(node, root, root.getChildCount());
        //model.insertNodeInto(node, root, model.getChildCount(root));
        model.reload(root);
    }
    public DefaultMutableTreeNode getSelectedNode() {
        return (DefaultMutableTreeNode)ctrl.getLastSelectedPathComponent();
    }
    public String[] getSelectedTreePath() {
        TreePath path = ctrl.getSelectionPath();
        if( path != null ) {
            int count = path.getPathCount();
            String[] nodes = new String[count];
            for( int i = 0; i < count; i++ ) {
                nodes[count-i-1] = path.getLastPathComponent().toString();
                path = path.getParentPath();
            }
            return nodes;
        }
        return null;
    }
}