這段程序主要用於比較sdk的版本號，例如 8.9.1 和8.9.0，8.9.1和8.7的比較。

import org.apache.commons.lang3.StringUtils;

import java.util.regex.Pattern;

public class NumUtils {

   /**
     * @description 比較SDK版本號
     * @param version1
     * @param version2
     * @return
     */
    public static int compareVersion(String version1, String version2){
        
 
if (version1 == null || version2 == null) {
        }
        version1 = version1.replaceAll("([^(\\d|\\.)])", "");
        version2 = version2.replaceAll("([^(\\d|\\.)])", "");
        String[] versionArray1 = version1.split("\\.");//註意此處為正則匹配， 不能用.；
        String[] versionArray2 = version2.split("\\.");
        
 
int idx = 0;
        int minLength = Math.min(versionArray1.length, versionArray2.length);//取最小長度值
        int diff = 0;
        while (idx < minLength
                && (diff = versionArray1[idx].length() - versionArray2[idx].length()) == 0//先比較長度
                && (diff = versionArray1[idx].compareTo(versionArray2[idx])) == 0) {//
 
再比較字符
            ++idx;
        }
        //如果已經分出大小，則直接返回，如果未分出大小，則再比較位數，有子版本的為大；
        diff = (diff != 0) ? diff : versionArray1.length - versionArray2.length;
        return diff;
    }
    public static void main(String[] args) {  

     System.out.println(compareVersion("6.0.0".replaceAll("([^(\\d|\\.)])", ""), "6.0.0") ==0);  //true
     System.out.println(compareVersion("5.6.1".replaceAll("([^(\\d|\\.)])", ""), "5.6.0") > 0);  //true
     System.out.println(compareVersion("5.6.1".replaceAll("([^(\\d|\\.)])", ""), "5.6.2") > 0);  //false

 } }

軟件版本號比較 java工具類