520. Detect Capital

#### QUESTION:

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:

1. All letters in this word are capitals, like “USA”.
2. All letters in this word are not capitals, like “leetcode”.
3. 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.

#### EXPLANATION:

1.首先判断第一个字母是大小写，小写就说明后面的字母都必须是小写。

2.如果是大写则判断后面第二个字母是大小写，小写则说明后面字母都必须是小写。

3.如果是大写则说明后面字母必须是大写。

#### SOLUTION:

``````public class Solution {
public boolean detectCapitalUse(String word) {
if(word.length()==1) return true;
int char0 = word.charAt(0);
if(char0>=97){
for(int i = 1;i<word.length();i++)
if(word.charAt(i)<97) return false;
} else{
int char1 = word.charAt(1);
if(char1>=97){
for(int i =2;i<word.length();i++){
if(word.charAt(i)<97) return false;
}
}else{
for(int i =2;i<word.length();i++){
if(word.charAt(i)>=97) return false;
}
}
}
return true;
}
}
``````
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