--- /dev/null	2020-01-02 04:43:18.583999853 +0000
+++ new/test/lib/jdk/test/lib/hprof/util/ArraySorter.java	2020-01-30 06:39:53.282110916 +0000
@@ -0,0 +1,147 @@
+/*
+ * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+
+/*
+ * The Original Code is HAT. The Initial Developer of the
+ * Original Code is Bill Foote, with contributions from others
+ * at JavaSoft/Sun.
+ */
+
+package jdk.test.lib.hprof.util;
+import java.util.*;
+
+/**
+ * A singleton utility class that sorts an array of objects.
+ * <p>
+ * Use:
+ * <pre>
+ *
+ *  Stuff[] arr = ...;
+ *  ArraySorter.sort(arr, new Comparer() {
+ *      public int compare(Object lhs, Object rhs) {
+ *          return ((String) lhs).compareTo((String) rhs);
+ *      }
+ *  });
+ * </pre>
+ *
+ * @author      Bill Foote
+ */
+
+public class ArraySorter {
+
+    /**
+     * Sort the given array, using c for comparison
+    **/
+    static public void sort(Object[] arr, Comparer c)  {
+        quickSort(arr, c, 0, arr.length-1);
+    }
+
+
+    /**
+     * Sort an array of strings, using String.compareTo()
+    **/
+    static public void sortArrayOfStrings(Object[] arr) {
+        sort(arr, new Comparer() {
+            public int compare(Object lhs, Object rhs) {
+                return ((String) lhs).compareTo((String) rhs);
+            }
+        });
+    }
+
+
+    static private void swap(Object[] arr, int a, int b) {
+        Object tmp = arr[a];
+        arr[a] = arr[b];
+        arr[b] = tmp;
+    }
+
+    //
+    // Sorts arr between from and to, inclusive.  This is a quick, off-the-top-
+    // of-my-head quicksort:  I haven't put any thought into optimizing it.
+    // I _did_ put thought into making sure it's safe (it will always
+    // terminate).  Worst-case it's O(n^2), but it will usually run in
+    // in O(n log n).  It's well-behaved if the list is already sorted,
+    // or nearly so.
+    //
+    static private void quickSort(Object[] arr, Comparer c, int from, int to) {
+        if (to <= from)
+            return;
+        int mid = (from + to) / 2;
+        if (mid != from)
+            swap(arr, mid, from);
+        Object pivot = arr[from];   // Simple-minded, but reasonable
+        int highestBelowPivot = from - 1;
+        int low = from+1;
+        int high = to;
+            // We now move low and high toward each other, maintaining the
+            // invariants:
+            //      arr[i] <= pivot    for all i < low
+            //      arr[i] > pivot     for all i > high
+            // As long as these invariants hold, and every iteration makes
+            // progress, we are safe.
+        while (low <= high) {
+            int cmp = c.compare(arr[low], pivot);
+            if (cmp <= 0) {   // arr[low] <= pivot
+                if (cmp < 0) {
+                    highestBelowPivot = low;
+                }
+                low++;
+            } else {
+                int c2;
+                for (;;) {
+                        // arr[high] > pivot:
+                    c2 = c.compare(arr[high], pivot);
+                    if (c2 > 0) {
+                        high--;
+                        if (low > high) {
+                            break;
+                        }
+                    } else {
+                        break;
+                    }
+                }
+                // At this point, low is never == high, BTW
+                if (low <= high) {
+                    swap(arr, low, high);
+                    if (c2 < 0) {
+                        highestBelowPivot = low;
+                    }
+                    low++;
+                    high--;
+                }
+            }
+        }
+        // At this point, low == high+1
+        // Now we just need to sort from from..highestBelowPivot
+        // and from high+1..to
+        if (highestBelowPivot > from) {
+            // pivot == pivot, so ensure algorithm terminates
+            swap(arr, from, highestBelowPivot);
+            quickSort(arr, c, from, highestBelowPivot-1);
+        }
+        quickSort(arr, c, high+1, to);
+    }
+}