--- /dev/null	2018-05-11 11:34:50.000000000 -0700
+++ new/src/demo/share/jfc/J2Ddemo/java2d/AnimatingSurface.java	2018-05-11 11:34:50.000000000 -0700
@@ -0,0 +1,111 @@
+/*
+ *
+ * Copyright (c) 2007, 2011, 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.
+ */
+
+
+package java2d;
+
+
+/**
+ * Demos that animate extend this class.
+ */
+@SuppressWarnings("serial")
+public abstract class AnimatingSurface extends Surface implements Runnable {
+
+    private volatile boolean running = false;
+
+    private volatile Thread thread;
+
+    public abstract void step(int w, int h);
+
+    public abstract void reset(int newwidth, int newheight);
+
+
+    public synchronized void start() {
+        if (!running() && !dontThread) {
+            thread = new Thread(this);
+            thread.setPriority(Thread.MIN_PRIORITY);
+            thread.setName(name + " Demo");
+            thread.start();
+            running = true;
+        }
+    }
+
+
+    public synchronized void stop() {
+        if (thread != null) {
+            running = false;
+            thread.interrupt();
+        }
+        thread = null;
+        notifyAll();
+    }
+
+
+    @Override
+    @SuppressWarnings("SleepWhileHoldingLock")
+    public void run() {
+
+        while (running() && !isShowing() || getSize().width == 0) {
+            try {
+                Thread.sleep(200);
+            } catch (InterruptedException ignored) {
+            }
+        }
+
+        while (running()) {
+            repaint();
+            try {
+                Thread.sleep(sleepAmount);
+            } catch (InterruptedException ignored) {
+            }
+        }
+        synchronized (this) {
+            running = false;
+        }
+    }
+
+    /**
+     * @return the running
+     */
+    public synchronized boolean running() {
+        return running;
+    }
+
+    /**
+     * Causes surface to repaint immediately
+     */
+    public synchronized void doRepaint() {
+        if (running() && thread != null) {
+            thread.interrupt();
+        }
+    }
+}