150.Evaluate Reverse Polish Notation

class Solution {
    public int evalRPN(String[] t) {
        Stack<Integer> ar = new Stack<>();
        for(String s:t){
            if(s.equals("+")){
                ar.push(ar.pop()+ar.pop());
            }
            else if(s.equals("-")){
                ar.push(-ar.pop()+ar.pop());
            }
            else if(s.equals("*")){
                ar.push(ar.pop()*ar.pop());
            }
            else if(s.equals("/")){
                ar.push((int)((1/(double)ar.pop())*ar.pop()));
            }
            else{
                ar.push(Integer.valueOf(s));
            }

        }
        return ar.pop();
    }
}