Compare version code like 1.7.17.1, 1.12.17.1。
Solution: compare method
public class VersionUtil {
/**
* 比较版本号的大小,前者大则返回一个正数,后者大返回一个负数,相等则返回0
* @param version1
* @param version2
* @return
*/
public static int compareVersion(String version1, String version2) {
String[] versionArray1 = version1.split("\\.");//注意此处为正则匹配，不能用"."；
String[] versionArray2 = version2.split("\\.");
int idx = 0;
int minLength = Math.min(versionArray1.length, versionArray2.length);//取最小长度值
int diff = 0;
while (idx < minLength
&& (diff = versionArray1[idx].length() - versionArray2[idx].length()) == 0//先比较长度
&& (diff = versionArray1[idx].compareTo(versionArray2[idx])) == 0) {//再比较字符
++idx;
}
//如果已经分出大小，则直接返回，如果未分出大小，则再比较位数，有子版本的为大；
diff = (diff != 0) ? diff : versionArray1.length - versionArray2.length;
return diff;
}
}
Example:
- how to use?
VersionUtil.compareVersion("1.7.17.1", "1.12.17.1");
Done.