Create A Java Irc Client Which Responds To Commands

For a shool assignment i have to create a java irc client. which responds to commands. the !SENDMSG command has two parameters !SENDMSG <username> <the message>.

i can get the username and the message seperated, but i would like to create a check in case someone gives a bad command like: !SENDMSG" " <-- note te extra spaces, or if someone gives only 1 parameter.

else if (line.contains("!SENDMSG")) {
String str = line.split("!SENDMSG")[1]; //gives: <username> <the message>

String[] parts = line.split("s+");

if (parts.length >= 2) {
String user = parts[4]; //gives the <username>

[code]....