Java SE (Java Platform, Standard Edition)

I am making an applet that will roll dice and print out the results. The results are printed using a variable string in a paint method, in this case "a". I am having issue making a new line before each set of new rolls and dont know what to do.

Here is the method I am having issues with:

public void roller(int sides, int rolls){
	if(rolls>0){
		a=a+"On a "+sides+" sided die you rolled: ";
		for(int T=0; T<rolls; T++){
			int result = (int)(Math.random()*sides+1);
			a= a + result;
			if(T<rolls-1){a=a+", ";}
			repaint();
		}
	}
}

I have tried \n but that doesnt seem to work.
I have also tried using

newline = System.getProperty("line.separator"); 

but it wont seem to work either.

any and all help is apreciated thanks.

oh and if that was to vague please say >.<