LeetCode 434. Number of Segments in a String

434. Number of Segments in a String

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• Total Accepted: 13229
• Total Submissions: 35604
• Difficulty: Easy
• Contributors: love_FDU_llp

Count the number of segments in a string, where a segment is defined to be a contiguous sequence of non-space characters.

Please note that the string does not contain any non-printable characters.

Example:

Input: "Hello, my name is John"
Output: 5

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【题目分析】

求一个字符串不包含空字符的子串有多少个。

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【思路】

1. 使用Srtring.spilt方法。split方法需要特别注意的一点是，如果字符串的头部与split传入的字符串正好匹配，那么结果会多返回一个空字符串。而在尾部出现则不会出现这种情况。

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【java代码】

public class Solution {
    public int countSegments(String s) {
        if(s == null) return 0;
        s = s.trim();
        if(s.length() == 0) return 0;
        
        return s.split("\\s+").length;
    }
}