String[] tokens = "C 1.1 8.15.1 P 15.10.2012 83".split(" ");
String c = tokens[0];
String one_dot_one = tokens[1];
String eight_dot_fifteen_dot_one = tokens[2];

String[] tokensFor1_1 = one_dot_one.split(".");
String[] tokensFor8_15_1 = eight_dot_fifteen_dot_one.split(".");

myObject.setVarC = c;
myObject.setVar2 = Integer.parseInt(tokensFor1_1[0]);
myObject.setVar3 = Integer.parseInt(tokensFor1_1[1]);
myObject.setVar4 = Integer.parseInt(tokensFor8_15_1[0]);
myObject.setVar5 = Integer.parseInt(tokensFor8_15_1[1]);
myObject.setVar6 = Integer.parseInt(tokensFor8_15_1[2]);

if (tokens.length > 2) {
    // обрабатываем P 15.10.2012 83...
}