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  1. Prepare
  2. Data Structures
  3. Stacks
  4. Balanced Brackets
  5. Discussions

Balanced Brackets

  • iamtodor
     + 4 comments

    I have improved and cleaned up your code. Here the effect:

    private static String isBalancedBrackets(String value) {
        Stack<Character> stack = new Stack<>();
        char upperElement = 0;
        for (int i = 0; i < value.length(); i++) {
            if (!stack.isEmpty()) {
                upperElement = stack.peek();
            }
            stack.push(value.charAt(i));
            if (!stack.isEmpty() && stack.size() > 1) {
                if ((upperElement == '[' && stack.peek() == ']') ||
                        (upperElement == '{' && stack.peek() == '}') ||
                        (upperElement == '(' && stack.peek() == ')')) {
                    stack.pop();
                    stack.pop();
                }
            }
        }
        return stack.isEmpty() ? "YES" : "NO";