diff --git a/test/028-array-write/src/Main.java b/test/028-array-write/src/Main.java
new file mode 100644
index 0000000..6f36f84
--- /dev/null
+++ b/test/028-array-write/src/Main.java
@@ -0,0 +1,68 @@
+// Copyright 2007 The Android Open Source Project
+
+/**
+ * Array write speed test.
+ */
+public class Main {
+    /** whether to report times */
+    static boolean timing = false;
+
+    static final int STORAGE_SIZE = 128*1024;
+    static int[] mStorage = new int[STORAGE_SIZE];
+
+    static public void report(long start, long end) {
+        if (! timing) {
+            return;
+        }
+
+        System.out.println("Finished in " + ((end - start) / 1000000.0)
+            + " msec");
+    }
+
+    static void writeArray(int val) {
+        for (int i = STORAGE_SIZE-1; i >= 0; i--)
+            mStorage[i] = val;
+    }
+
+    static void writeTest() {
+        long start, end;
+
+        writeArray(0);  // touch all the memory
+
+        System.out.println("Running writeTest...");
+        start = System.nanoTime();
+        for (int i = 1; i < 20; i++)
+            writeArray(i);
+        end = System.nanoTime();
+
+        report(start, end);
+    }
+
+    static void copyTest() {
+        long start, end;
+
+        // touch once
+        System.arraycopy(mStorage, 0, mStorage,
+            STORAGE_SIZE/2, STORAGE_SIZE/2);
+
+        System.out.println("Running copyTest...");
+        start = System.nanoTime();
+        for (int i = 1; i < 35; i++) {
+            System.arraycopy(mStorage, 0, mStorage,
+                STORAGE_SIZE/2, STORAGE_SIZE/2);
+        }
+        end = System.nanoTime();
+
+        report(start, end);
+    }
+
+    public static void main(String[] args) {
+        if ((args.length >= 1) && args[0].equals("--timing")) {
+            timing = true;
+        }
+
+        writeTest();
+        copyTest();
+        System.out.println("Done!");
+    }
+}