Work out whether brackets {[()]} are balanced

JavaBalance.java

import java.util.Stack;

public class Main {

    public static void main(String[] args) {

        String s = "[]{}[][]";
        boolean b = isBalanced(s);
        System.out.println(b);

        String s2 = "[]{}[}][]";
        boolean b2 = isBalanced(s2);
        System.out.println(b2);

        String s3 = "{{})";
        boolean b3 = isBalanced(s3);
        System.out.println(b3);

        String s4 = "{{{{((]";
        boolean b4 = isBalanced(s4);
        System.out.println(b4);

    }


    public static boolean isBalanced(String s) {
        Stack<Character> balanceStack  = new Stack<>();

        for(char token : s.toCharArray()) {

            // Add Opening Tokens to a Stack
            if( token == '{' || token == '[' || token == '(' ) {
                balanceStack.push(token);
            }

            // Inspect relevant closing token
            else if (!balanceStack.isEmpty()) {
                char open = balanceStack.pop();

                // Check of mismatch between closing token
                // and token on top of stack
                if (token == '}') {
                    if (open != '{') {
                        return false;
                    }
                }
                else if (token == ']') {
                    if (open != '[') {
                        return false;
                    }
                }
                else if (token == ')') {
                    if (open != '(') {
                        return false;
                    }
                }
            }
        }
        return true;
    }

}