使用 Java 比较版本号：超越正则表达式

import java.util.Arrays;
import java.util.stream.Collectors;
import java.util.stream.Stream;

class Version implements Comparable<Version> {
    final int[] parts;

    Version(String vs) {
        parts = Stream.of(vs.split("\.")).mapToInt(Integer::parseInt).toArray();
    }

    @Override
    public String toString() {
        return Arrays.stream(parts)
            .map(Integer::toString)
            .collect(Collectors.joining("."));
    }

    @Override
    public int compareTo(Version other) {
        int minLength = Math.min(parts.length, other.parts.length);
        for (int i = 0; i < minLength; i++) {
            int comparison = Integer.compare(parts[i], other.parts[i]);
            if (comparison != 0) {
                return comparison;
            }
        }
        return Integer.compare(parts.length, other.parts.length); // Handle cases like "1.0" vs "1.0.0"
    }

    // Example usage
    public static void main(String[] args) {
        Version version1 = new Version("10.0.1");
        Version version2 = new Version("1.2.1");
        Version version3 = new Version("10.0.1");
        Version version4 = new Version("10.1");
        Version version5 = new Version("10.1.0");


        System.out.printf("%s compareTo %s: %d%n", version1, version2, version1.compareTo(version2));
        System.out.printf("%s compareTo %s: %d%n", version1, version3, version1.compareTo(version3));
        System.out.printf("%s compareTo %s: %d%n", version1, version4, version1.compareTo(version4));
        System.out.printf("%s compareTo %s: %d%n", version4, version5, version4.compareTo(version5));

        if (version1.compareTo(version2) <= 0) {
            System.out.printf("%s <= %s%n", version1, version2);
        }
    }
}

Version version1 = new Version("10.0.1");
Version version2 = new Version("1.2.1");
if (version1.compareTo(version2) <= 0) {
    System.out.printf("%s <= %s%n", version1, version2);
}