0520. Detect Capital

class Solution {
    public boolean detectCapitalUse(String word) {
        if(word.length() < 2) return true;
        if(Character.isUpperCase(word.charAt(0)) && Character.isUpperCase(word.charAt(1))){
            for(int i = 2; i < word.length(); i++){
                if(Character.isLowerCase(word.charAt(i))) return false;
            }
        }
        else{
            for(int i = 1; i < word.length(); i++){
                if(Character.isUpperCase(word.charAt(i))) return false;
            }
        }
        return true;
    }
}