diff -r 000000000000 -r b1a7da25b547 samples/filebrowser.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/filebrowser.js	Wed Apr 27 01:36:41 2016 +0800
@@ -0,0 +1,100 @@
+#// Usage: jjs -fx filebrowser.js -- <start_dir>
+
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ *   - Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 
+ *   - Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 
+ *   - Neither the name of Oracle nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+// Uses -fx and javafx TreeView to visualize directories
+if (!$OPTIONS._fx) {
+    print("Usage: jjs -fx filebrowser.js -- <start_dir>");
+    exit(1);
+}
+
+// Java classes used
+var File = Java.type("java.io.File");
+var Files = Java.type("java.nio.file.Files");
+
+// check directory argument, if passed
+var dir = arguments.length > 0? new File(arguments[0]) : new File(".");
+if (! dir.isDirectory()) {
+    print(dir + " is not a directory!");
+    exit(2);
+}
+
+// JavaFX classes used
+var FXCollections = Java.type("javafx.collections.FXCollections");
+var Scene     = Java.type("javafx.scene.Scene");
+var TreeItem  = Java.type("javafx.scene.control.TreeItem");
+var TreeView  = Java.type("javafx.scene.control.TreeView");
+
+// create a subclass of JavaFX TreeItem class
+var LazyTreeItem = Java.extend(TreeItem);
+
+// lazily filling children of a directory LazyTreeItem
+function buildChildren(dir) {
+    var children = FXCollections.observableArrayList();
+    var stream = Files.list(dir.toPath());
+    stream.forEach(function(path) {
+        var file = path.toFile();
+        var item = file.isDirectory()?
+            makeLazyTreeItem(file) : new TreeItem(file.name);
+        children.add(item);
+    });
+    stream.close();
+    return children;
+}
+
+// create an instance LazyTreeItem with override methods
+function makeLazyTreeItem(dir) {
+    var item = new LazyTreeItem(dir.name) {
+        expanded: false,
+        isLeaf: function() false,
+        getChildren: function() {
+            if (! this.expanded) {
+                // call super class (TreeItem) method
+                Java.super(item).getChildren().setAll(buildChildren(dir));
+                this.expanded = true;
+            }
+            // call super class (TreeItem) method
+            return Java.super(item).getChildren();
+        }
+    }
+    return item;
+}
+
+// JavaFX start method
+function start(stage) {
+    stage.title = dir.absolutePath;
+    var rootItem = makeLazyTreeItem(dir);
+    rootItem.expanded = true;
+    var tree = new TreeView(rootItem);
+    stage.scene = new Scene(tree, 300, 450);
+    stage.show();
+}