Check balanced parentheses

Question: Given a string which contains alpha numeric characters with opening and closing parentheses, check whether parenthesis are balanced correctly.

Solution:

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public boolean isBalanceParenthesis(String str){         int count = 0;         for(int i=0; i < str.length(); i++) {             if(str.charAt(i) == '(') {                 count++;             }             else if(str.charAt(i) == ')') {                 count--;             }             if(count<0){                 return false;             }         }         return count == 0;     }