public static boolean testBalance(String s) {
       charStack stk = new charStack();
       boolean okay = true;
       for (int i=0; okay && (i <  s.length()); i++)
        {  char c = s.charAt(i);
           switch ( c ) {
           case '(': case '{': case '[':
               stk.push(c);
               break;
           case ')':
               if ( stk.empty() ||
                    ( stk.pop() != '(' ) )
                   okay = false;
               break;
           // same for '}' and ']'
           default: okay = false; break;
           } }
       return (okay && stk.empty() ); }

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