/**
 * Given a word, you need to judge whether the usage of capitals in it is right or not.
 *
 *We define the usage of capitals in a word to be right when one of the following cases holds:
 *
 *All letters in this word are capitals, like "USA".
 *All letters in this word are not capitals, like "leetcode".
 *Only the first letter in this word is capital if it has more than one letter, like "Google".
 *Otherwise, we define that this word doesn't use capitals in a right way.
 *Example 1:
 *Input: "USA"
 *Output: True
 *Example 2:
 *Input: "FlaG"
 *Output: False
 *Note: The input will be a non-empty word consisting of uppercase and lowercase latin letters.
 *
 *
 */
class Solution {
    public boolean detectCapitalUse(String word) {
        return word.matches("^[A-Z][a-z]+$") || word.matches("^[A-Z]+$") || word.matches("^[a-z]+$");
    }
}

Create DetectCapital.java