【面试题】Java 2个(多个)大整数相加如何实现

/**
 * Created by shirenchuang on 2018/6/28.
 */
public class BigDataAddUtils {
    public static String add(String... params){
        int maxLeng = 0;
        //获取最大长度
        for(String s :params){
            if(s.length()>maxLeng)maxLeng=s.length();
        }

        StringBuffer result = new StringBuffer();
        //进位 数
        int high= 0;
        //将每个待加参数每一位相加 进位
        for (int i = 0 ;i<maxLeng;i++){
            int charInt = 0;
            for(String s :params){
                //高位不够用0代替
                charInt += s.length()-1<i?0: Integer.parseInt(s.charAt(s.length()-1-i)+"");
            }
            charInt+=high;
            //进位
            high = charInt/10;
            //当前位的值 为charInt 余数
            int remainder = charInt%10;
            result.append(remainder);
        }
        //最后一次进位
        if(high>0){
            result.append(high);
        }
        //反转 输出结果
        return result.reverse().toString();
    }

    public static void main(String[] args) {
        System.out.print(add("10023888888888842340","9133333333319","1912"));
    }
}