--- /dev/null	2014-02-02 21:38:46.000000000 +0800
+++ new/src/share/sample/stream/Selection.java	2014-02-02 21:38:46.000000000 +0800
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2013 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.
+ */
+
+/*
+ * This source code is provided to illustrate the usage of a given feature
+ * or technique and has been deliberately simplified. Additional steps
+ * required for a production-quality application, such as security checks,
+ * input validation and proper error handling, might not be present in
+ * this sample code.
+ */
+package stream;
+
+import stream.data.Customer;
+import stream.data.Order;
+import java.util.Map;
+import java.util.function.Function;
+import static java.util.stream.Collectors.toConcurrentMap;
+
+public class Selection extends DemoHelper {
+
+    /**
+     * Mapping customer to its total order price, only customer whose total
+     * order price is bigger than bigValue will be put into the map
+     *
+     * @param bigValue customer's total price low limit
+     * @return a map which map customer to its order price
+     */
+    public static Map<Customer, Double> bigOrderCustomers(double bigValue) {
+        Function<Customer, Double> orderTotal
+                = c -> c.getOrders().stream().
+                //map order to order price
+                mapToDouble(Order::getTotal).
+                //calculate total price
+                sum();
+        Map<Customer, Double> customersToBigOrder = customers.stream().
+                //grouping customer to a Map which key is customer, value is
+                //total order price
+                collect(toConcurrentMap(Function.identity(),
+                                orderTotal));
+        customersToBigOrder.forEach((customer, totalAmount) -> {
+            //Remove all customer whose total order amount is not greater than
+            //bigValue
+            if (totalAmount <= bigValue) {
+                customersToBigOrder.remove(customer);
+            }
+        });
+        return customersToBigOrder;
+    }
+}