java实现大数加法

import java.util.Scanner;import java.io.*;import java.math.BigDecimal; public class Main {public static void main(String[] args) {int n;Scanner in = new Scanner(System.in);n=in.nextInt();while(n--!=0){String s1,s2;s1=in.next();s2=in.next();BigDecimal b1 = new BigDecimal(s1);BigDecimal b2 = new BigDecimal(s2);System.out.printf("%s",s1);System.out.print("+");System.out.printf("%s",s2);System.out.print("=");System.out.println(b1.add(b2));}}}