--- /dev/null 2014-11-21 16:40:26.217363000 +0100 +++ new/test/java/util/SystemRandom/SystemRandomTest.java 2014-12-02 17:01:20.344214762 +0100 @@ -0,0 +1,55 @@ +/* + * Copyright (c) 2014, 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. + * + * 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. + */ + +import java.util.Arrays; +import java.util.SystemRandom; + +/* + * @test + * @summary Test for java.util.SystemRandom + */ +public class SystemRandomTest { + public static void main(String[] args) { + System.out.println("SystemRandomTest... (8 bytes / invocation)"); + byte[] bytes = new byte[8]; + long t0 = System.nanoTime(); + try (SystemRandom sr = SystemRandom.newInstance()) { + sr.getBytes(bytes); + long t1 = System.nanoTime(); + System.out.println("1st invocation: " + + (t1 - t0) + " ns, result: " + Arrays.toString(bytes)); + + final int N = 1_000_000; + + t0 = System.nanoTime(); + for (int i = 0; i < N; i++) { + sr.getBytes(bytes); + } + t1 = System.nanoTime(); + + System.out.println("Following " + N + " invocations: " + + ((double)(t1 - t0)/1e9d) + " s, (" + + ((t1-t0)/N) + " ns/invocation)"); + } + } +}