這是QRCodeDecoder類中的decode源碼，求大神幫忙，這個是什么問題

public byte[] decode(QRCodeImage qrCodeImage) throws DecodingFailedException { ? ?

Point[] adjusts = getAdjustPoints(); ? ?

Vector results = new Vector(); ? ?

numTryDecode = 0; ? ?

while (numTryDecode < adjusts.length) { ? ?

try { ? ?

DecodeResult result = decode(qrCodeImage, adjusts[numTryDecode]); ? ?

if (result.isCorrectionSucceeded()) { ? ?

return result.getDecodedBytes(); ? ?

} ? ?

else { ? ?

results.addElement(result); ? ?

} ? ?

} catch (DecodingFailedException dfe) { ? ?

if (dfe.getMessage().indexOf("Finder Pattern") >= 0) ? ?

throw dfe; ? ?

} finally { ? ?

numTryDecode += 1; ? ?

} ? ?

} ? ?

? ?

if (results.size() == 0) ? ?

throw new DecodingFailedException("Give up decoding"); ? ?