你如何比较 Java 中的两个版本字符串？

Question

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 1

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 2

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 3

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 4

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 5

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 6

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 7

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 8

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 9

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 10

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 11

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 12

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 13

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 14

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 15

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 16

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 17

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 18

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 19

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 20

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 21

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 22

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 23

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 24

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 25

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 26

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 27

The most simple solution is using string compare. Remove the unwanded dots or letters in case the version is like v1.0.1Beta using Regex("[^0-9]") and you get for versions like 1.0 and 1.0.1:

String ver1 = "10";
String ver2 = "101";
    
int res = ver1.compareTo(ver2);
System.out.println("res: "+res);

If ver1 is lexicographically less than ver2 , a negative number will be returned, 0 if equal or a positive number if ver1 is greater.

The compareTo() method compares two strings lexicographically.

The comparison is based on the Unicode value of each character in the strings.

The method returns 0 if the string is equal to the other string. A value less than 0 is returned if the string is less than the other string (less characters) and a value greater than 0 if the string is greater than the other string (more characters).

Answer 28

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 29

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 30

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 31

Is there a standard idiom for comparing version numbers? I can't just use a straight String compareTo because I don't know yet what the maximum number of point releases there will be. I need to compare the versions and have the following hold true:

1.0 < 1.1
1.0.1 < 1.1
1.9 < 1.10

Answer 32

My java Solution

 public int compareVersion(String version1, String version2) {

    String[] first = version1.split("\\.");
    String[] second = version2.split("\\.");

    int len = first.length<=second.length? first.length:second.length;

    // the loop runs for whichever is the short version of two strings
    for(int i=0;i<len;i++){
      int firstInt = Integer.parseInt(first[i]);
      int secondInt = Integer.parseInt(second[i]);
        if(firstInt<secondInt){
            return -1;
        }
        else if(firstInt>secondInt){
            return 1;
        }
    }

    // below two condition check if the length are the not the same

    //if first string length is short then start from after first string length and compare it with second string value. second string value is not zero that means it is greater.
    if(first.length<second.length){
        for(int i=first.length;i<second.length;i++){
            int secondInt = Integer.parseInt(second[i]);
            if(secondInt!=0){
                return -1;
            }
        }
    }
    // similar logic as above just that first length is grater this time.
     else if(first.length>second.length){
        for(int i=second.length;i<first.length;i++){
            int firstInt = Integer.parseInt(first[i]);
            if(firstInt!=0){
                return 1;
            }
        }        
    }

    // return 0 if both string value is the same
    return 0;

}