纪东东-博客

1.版本号工具

之前在网上看到版本号工具，觉得还行，就一直用这个。代码如下，写的也挺简洁的

public static int compareAppVersion(String version1, String version2) {
    if (version1 == null || version2 == null) {
        throw new RuntimeException("版本号不能为空");
    }
    // 注意此处为正则匹配，不能用.
    String[] versionArray1 = version1.split("\\.");
    String[] versionArray2 = version2.split("\\.");
    int idx = 0;
    // 取数组最小长度值
    int minLength = Math.min(versionArray1.length, versionArray2.length);
    int diff = 0;
    // 先比较长度，再比较字符
    while (idx < minLength
            && (diff = versionArray1[idx].length() - versionArray2[idx].length()) == 0
            && (diff = versionArray1[idx].compareTo(versionArray2[idx])) == 0) {
        ++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;
}