Count each occurrence of a random number

I'm not too good at Java (just started learning it recently). What i have is this method:

String gInfo(){
   String[] Behavior = {"Sleeping", "Running home", "Studying", "playing pool", "walking to class"};
       int rNum = (int) (Math.random() * Behavior.length);
       return Behavior[rNum];

Basically what I'm trying to do is figure out how to calculate the number of times each array element occurs and turn it into a percentage.