Java mini project

public class Main {

public static int levelCount(String json) {
    int maxDepth = 0;
    int currentDepth = 0;

    for (int i = 0; i < json.length(); i++) {
        char c = json.charAt(i);

        if (c == '{' || c == '[') {
            currentDepth++;
            maxDepth = Math.max(maxDepth, currentDepth);
        } else if (c == '}' || c == ']') {
            currentDepth--;
        }
    }

    return maxDepth;
}

public static void main(String[] args) {
    System.out.println(levelCount(args[0]));
}

}