How to log on to a Java instance in sap

How do you log on to a Java instance?

You can log on to the Java instance using any of the following tools.

1. Telnet:
   telnet
   where = 50000 + instance Nr * 100 + 8, i.e.
   50008 for instance 00
   user Administrator, pwd from the installation phase

2. Visual Administrator:
   /usr/sap//JC00/j2ee/admin/go.sh or go.bat
   create new connection, user Administrator, pwd from the installation phase, port 50000 + instance Nr * 100 + 4, i.e. 50004 for instance 00

3. Config Tool:
   /usr/sap//JC00/j2ee/configtool/configtool.sh or configtool.bat