Compare two version numbers version1 and version1.
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
1、String类的使用
split方法,不能使用“.”进行分割,因为split实际使用了正则表达式,而“.”在正则里是特殊字符,故要使用“[.]”形式
2、数据的考虑
不要认为输入数据都是X.X的形式,还有特殊的形式,如1.0和1、01和1,1和1.0等,因为这关系到这个算法里比较到什么时候结束,
3、感觉自己学的不错,而实际上依然是眼高手低,
4、算法的改进方面,希望各位大哥大姐能够提出宝贵意见
5、小小算法,在各位面前献丑了
public class Solution { public int compareVersion(String version1, String version2) { String[] ver1 = version1.split("[.]"); String[] ver2 = version2.split("[.]"); int[] v1 = new int[ver1.length]; int[] v2 = new int[ver2.length]; for(int i = 0 ; i < ver1.length; i ++){ v1[i] = Integer.parseInt(ver1[i]); } for(int i = 0 ; i < ver2.length; i ++){ v2[i] = Integer.parseInt(ver2[i]); } int i = 0 ; for(i = 0; i < v1.length && i < v2.length; i ++){ if(v1[i] < v2[i]){ return -1; }else if(v1[i] > v2[i]){ return 1; }else if(v1[i] == v2[i]){ continue; } } if(i < v1.length){//v1还有数据, if(v1[i] != 0) return 1; } if(i < v2.length){ if(v2[i] != 0) return -1; } return 0; } }