DynamicCompositeByteBuf { public DynamicCompositeByteBuf readBytes(byte[] dst) { return readBytes(dst, 0, dst.length); } DynamicCompositeByteBuf();  DynamicCompositeByteBuf(int capacity);  DynamicCompositeByteBuf(ByteBuf buf);  DynamicCompositeByteBuf(ByteBuf[] bufs, int offset, int len); int readableBytes(); boolean isEmpty(); boolean hasArray(); byte[] array(); int arrayOffset(); int readerIndex(); boolean isReadable(); ByteBuf nettyByteBuf(); void addBuffer(ByteBuf buffer); ByteBuf readRetainedSlice(int length); ByteBuf retainedSlice(int length); void skipBytes(int length); DynamicCompositeByteBuf readBytes(byte[] dst); DynamicCompositeByteBuf readBytes(byte[] dst, int dstIndex, int length); byte readByte(); short readUnsignedByte(); short readShort(); short readShortLE(); int readUnsignedShort(); int readUnsignedShortLE(); int readInt(); int readIntLE(); long readLong(); long readLongLE(); char readChar(); float readFloat(); float readFloatLE(); double readDouble(); double readDoubleLE(); ByteOrder order(); void release(); @Override String toString();  }
@Test public void testReadBytes() { DynamicCompositeByteBuf compositeByteBuf = new DynamicCompositeByteBuf(); ByteBuf byteBuf1 = Unpooled.wrappedBuffer("hello".getBytes()); compositeByteBuf.addBuffer(byteBuf1); byte[] bytes = new byte[byteBuf1.readableBytes()]; compositeByteBuf.readBytes(bytes); String msg = new String(bytes); Assert.assertTrue(msg.equals("hello")); }