/* * Copyright (c) 2019, 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. */package org.openjdk.bench.java.nio;import java.nio.CharBuffer;import java.util.Arrays;import java.util.concurrent.TimeUnit;import org.openjdk.jmh.annotations.Benchmark;import org.openjdk.jmh.annotations.BenchmarkMode;import org.openjdk.jmh.annotations.Level;import org.openjdk.jmh.annotations.Mode;import org.openjdk.jmh.annotations.OutputTimeUnit;import org.openjdk.jmh.annotations.Param;import org.openjdk.jmh.annotations.Scope;import org.openjdk.jmh.annotations.Setup;import org.openjdk.jmh.annotations.State;@BenchmarkMode(Mode.AverageTime)@OutputTimeUnit(TimeUnit.NANOSECONDS)@State(Scope.Thread)public class CharBuffers { @Param({"2", "256", "16384"}) public int numChars; public String str; public CharBuffer buf; @Setup(Level.Iteration) public void createString() { char[] c = new char[numChars]; Arrays.fill(c, 'X'); str = String.valueOf(c); buf = CharBuffer.allocate(numChars); } @Benchmark public CharBuffer putString() { buf.clear(); return buf.put(str); }}