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JAVA I have a java project to ask the user to create a username and password and then after having some users and password ask

JAVA

I have a java project to ask the user to create a username and password and then after having some users and password ask them to login (we have to check if the user and password is ok) so:

1-create user and pass

2-login

I know I have to use Buffer Writer and Buffer reader but i do not know how

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