I had hear some people said that thay can recorvery passphrase wallet.dat with open wallet.dat by hex editor.
it's real ?
No. Wallet passphrase's are not stored in the wallet.dat. They're used to encrypt information within the wallet.dat file.
If someone claimed this, they either have no idea what they're talking about or they're probably hoping to get someone who doesn't know any better to "prepay" a recovery fee.
EDIT: Just realised this is in BitcoinJ board... So are you referring to a "Bitcoin Core" wallet.dat? or were you asking about a wallet file for a different wallet?

Hi,
I had my wallet by bitcoin core but forget password. I had aks to some person, they said me can get Wallet passphrase's by hex editor.
But i no peace of mind to send wallets to them.
Can you suggest me a few solutions
Thank