How to fix ora-01017: invalid user name / password login denied

Abstract ：
ORA-01017: user name / Invalid password ; Login denied
2
ORA-00922: Missing or invalid option

problem ：
use PL/SQL Developer Sign in Oracle Appears when the client ：
ORA-01017: user name / Invalid password ; Login denied

resolvent ：（ Changing the password directly is simple and effective , The operation is as follows ）
1. Open the command line
2. Switch to oracle user
3. Enter the command sqlplus / as sysdba（ With DBA Identity login oracle）
4. Enter the command select * from all_users;（ see DBA All users that can be controlled . Be careful ： Don't forget the semicolon , Otherwise 2 ）
5. Change the user password alter user user name identified by New password ;（ The new password should conform to the specification , Otherwise ORA-00922: Missing or invalid option error message . Be careful ： Don't forget the semicolon ）
6. Modification successful , Try again PL/SQL Developer Login ！