implement in java .. The user should be able to sign up to the system. The user should provide his  username, email and password. The system should check if the username or the email  is registered before, if they are not registered before then the signup process should  complete successfully, if not, the system will show an error to the user

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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implement in java .. The user should be able to sign up to the system. The user should provide his 
username, email and password. The system should check if the username or the email 
is registered before, if they are not registered before then the signup process should 
complete successfully, if not, the system will show an error to the user

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