Here you can find the source of putByteBuffer(ByteBuffer source, ByteBuffer target)
public static void putByteBuffer(ByteBuffer source, ByteBuffer target)
//package com.java2s; /**// w w w . j a va 2s . c o m * Copyright 2007-2016, Kaazing Corporation. All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.nio.ByteBuffer; public class Main { /** * Writes the contents of source to target without mutating source (so safe for * multithreaded access to source) and without GC (unless source is a direct buffer). */ public static void putByteBuffer(ByteBuffer source, ByteBuffer target) { if (source.hasArray()) { byte[] array = source.array(); int arrayOffset = source.arrayOffset(); target.put(array, arrayOffset + source.position(), source.remaining()); } else { target.put(source.duplicate()); } } }