Here you can find the source of toArray(ByteBuffer buffer)
public static byte[] toArray(ByteBuffer buffer)
//package com.java2s; /**/*from w w w . j a v a 2 s. com*/ * Copyright 2015 Confluent Inc. * * 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 { /** * Read the given byte buffer into a byte array */ public static byte[] toArray(ByteBuffer buffer) { return toArray(buffer, 0, buffer.limit()); } /** * Read a byte array from the given offset and size in the buffer */ public static byte[] toArray(ByteBuffer buffer, int offset, int size) { byte[] dest = new byte[size]; if (buffer.hasArray()) { System.arraycopy(buffer.array(), buffer.arrayOffset() + offset, dest, 0, size); } else { int pos = buffer.position(); buffer.get(dest); buffer.position(pos); } return dest; } }