434. Number of Segments in a String

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

Code:

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

解题思路

• 使用s.trim();函数，去掉字符串首位的空白；
• 使用s.split(String reg);函数配合正则表达式，将字符串分割成若干块后返回长度。