Java 常用工具类(31) : 计算时间与存储

public class MathUtil {

    
    public static String countStorageDescribe(Long kb) {
        if (kb == null) {
            return "";
        }
        double res = round(kb / 1024.0 / 1024 / 1024 / 1024);
        if (res > 1) {
            return res + "TB";
        }
        res = round(kb / 1024.0 / 1024 / 1024);
        if (res > 1) {
            return res + "GB";
        }
        res = round(kb / 1024.0 / 1024);
        if (res > 1) {
            return res + "MB";
        }
        res = round(kb / 1024.0);
        if (res > 1) {
            return res + "KB";
        }
        return kb + "kb";
    }

    public static String countHaoshi(Long timeMillis) {
        if (timeMillis == null) {
            return "";
        }
        double res = round(timeMillis / 1000.0 / 60 / 60 / 24 / 30 / 12);
        if (res > 1) {
            return res + "年";
        }
        res = round(timeMillis / 1000.0 / 60 / 60 / 24 / 30);
        if (res > 1) {
            return res + "月";
        }
        res = round(timeMillis / 1000.0 / 60 / 60 / 24);
        if (res > 1) {
            return res + "日";
        }
        res = round(timeMillis / 1000.0 / 60 / 60);
        if (res > 1) {
            return res + "时";
        }
        res = round(timeMillis / 1000.0 / 60);
        if (res > 1) {
            return res + "分";
        }
        res = round(timeMillis / 1000.0);
        if (res > 1) {
            return res + "秒";
        }
        return timeMillis + "毫秒";
    }

    private static Double round(Double d){
        return DoubleUtil.round(d,2);
    }

    public static void main(String[] args) {
        System.out.println(countHaoshi(1000*60*60*2L));
    }
}

DoubleUtil:

Java 常用工具类(29) : 保留小数_Lxinccode的博客-CSDN博客_java 保留两位小数 工具类