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Currently I have a text file where I store username/password on to a text file!
I want to store hashmap of username->{password,other user info}.
This is just initial prototype, finally I will use a SQL database to store these values.
I did some google searches and people are mostly talking about connecting to sql database, is it easier than attemping to store it temporarily ?
You might try marshalling/unmarshalling the data as JSON using a library like GSON. The data would be stored on disk. This approach will be lighter weight than SQLite for your prototype and shouldn’t require too much throwaway code.