java-数组连接的几种方式

byte[] message = new byte[heads.length + result.length + bodies.length];
        System.arraycopy(heads, 0, message, 0, heads.length);
        System.arraycopy(result, 0, message, heads.length, result.length);
        System.arraycopy(bodies, 0, message, heads.length + result.length, bodies.length);

ByteBuf buffer = Unpooled.buffer();
        buffer.writeBytes(heads);
        buffer.writeBytes(result);
        buffer.writeBytes(bodies);

        byte[] message1 = new byte[buffer.readableBytes()];
        buffer.readBytes(message1);