If version1 > version2 return 1, if version1 < version2 return -1, otherwise return 0.
You may assume that the version strings are non-empty and contain only digits and the . character.
The . character does not represent a decimal point and is used to separate number sequences.
For instance, 2.5 is not "two and a half" or "half way to version three", it is the fifth second-level revision of the second first-level revision.
Here is an example of version numbers ordering:
0.1 < 1.1 < 1.2 < 13.37
给定两个非空字符串,里面包含数字和‘ . ’,代表着不同的版本号,让我们判断版本的高低。我们可以用split方法把字符串通过' . '进行分割,得到两个字符串数组,然后依次比较相同位置代表数字的大小。代码如下:
public class Solution { public int compareVersion(String version1, String version2) { String[] s1 = version1.split("\\."); String[] s2 = version2.split("\\."); int i = 0; for(i = 0; i < s1.length && i < s2.length; i++) { if(Integer.parseInt(s1[i]) != Integer.parseInt(s2[i])) return Integer.parseInt(s1[i]) > Integer.parseInt(s2[i]) ? 1 : -1; } for(; i < s1.length; i++) { if(Integer.parseInt(s1[i]) != 0) return 1; } for(; i < s2.length; i++) { if(Integer.parseInt(s2[i]) != 0) return -1; } return 0; } }