The command is a String and can be anything the remote shell accepts. Try
cmd1 ; cmd2 ; cmd3
to run several commands in sequence. Or
cmd1 && cmd2 && cmd3
to run commands until one fails.
Even this might work:
cmd1
cmd2
cmd3
or in Java:
channel.setCommand("cmd1\ncmd2\ncmd3");
Sidenote: Don’t put passwords and user names into the code. Put them into a property file and use a system property to specify the name of the property file. That way, you can keep the file even outside the project and make sure passwords/user names don’t leak.