b438cffdb9
Co-authored-by: Vladimir Ivanov <vaivanov@openjdk.org> Reviewed-by: sviswanathan, ecaspole
57 lines
1.8 KiB
Java
57 lines
1.8 KiB
Java
/*
|
|
* Copyright (c) 2019, 2020, 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.
|
|
*/
|
|
|
|
package org.openjdk.bench.java.lang;
|
|
|
|
import org.openjdk.jmh.annotations.*;
|
|
import java.util.concurrent.TimeUnit;
|
|
|
|
@BenchmarkMode(Mode.AverageTime)
|
|
@OutputTimeUnit(TimeUnit.NANOSECONDS)
|
|
@Fork(value = 3)
|
|
@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
|
|
@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
|
|
@State(Scope.Thread)
|
|
public class StringSubstring {
|
|
|
|
public String s = new String("An arbitrary string that happened to be of length 52");
|
|
|
|
@Benchmark
|
|
public String from26toEnd0() {
|
|
return s.substring(26);
|
|
}
|
|
|
|
@Benchmark
|
|
public String from26toEnd1() {
|
|
return s.substring(26, s.length());
|
|
}
|
|
|
|
/**
|
|
* An empty substring should not allocate a new String
|
|
*/
|
|
@Benchmark
|
|
public String empty() {
|
|
return s.substring(17, 17);
|
|
}
|
|
}
|