How to change or unlock HR/OE account

Dear friends you may face unlock your oracle database account in prior of  using sqlplus / isqlplus. I am showing you the code you can wite as sql statement in system.

1st 

login system/sys as {give your user name system/password}

2nd

write down the following sql statement on your sqlplus/isqlplus:

alter user hr identified by hr account unlock;

if you want to change oe user you can write the same statement: 

alter user oe identified by oe account unlock;