UTF-8 byte []到String

假设我刚刚使用 BufferedInputStream 将UTF-8编码的文本文件的字节读入字节数组。我知道我可以使用以下例程将字节转换为字符串，但有没有比仅仅迭代字节并转换每个字节更有效/更智能的方法呢？

Let's suppose I have just used a BufferedInputStream to read the bytes of a UTF-8 encoded text file into a byte array. I know that I can use the following routine to convert the bytes to a string, but is there a more efficient/smarter way of doing this than just iterating through the bytes and converting each one?

public String openFileToString(byte[] _bytes)
{
    String file_string = "";

    for(int i = 0; i < _bytes.length; i++)
    {
        file_string += (char)_bytes[i];
    }

    return file_string;    
}