力扣每日一题2021-11-13检测大写字母

• 520.检测大写字母
• • 题目描述
  • 思路：模拟
  • • Python实现
    • Java实现

检测大写字母

根据题意对三种状态分别匹配即可。

class Solution:
    def detectCapitalUse(self, word: str) -> bool:
        # 模拟
        if str.islower(word[0]):
            return str.islower(word)
        if len(word) <= 2:
            return True
        if str.islower(word[1]):
            return str.islower(word[2:])
        return str.isupper(word)

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