【java】大整数相加

import static java.lang.Math.*;
import java.util.*;//输入的类库
public class E2 {
	public static String NumberSum (String numberA,String numberB) {
		int arrayA[],arrayB[],arrayC[],temp;
		int maxlength = numberA.length() > numberB.length() ? numberA.length() : numberB.length();
		arrayA = new int [maxlength+1];
		arrayB = new int [maxlength+1];
		arrayC = new int [maxlength+1];
		for(int i=0;i<numberA.length();i++) 
			arrayA[i]=numberA.charAt(numberA.length()-1-i)-'0';
		for(int i=0;i<numberB.length();i++) 
			arrayB[i]=numberB.charAt(numberB.length()-1-i)-'0';
		int flag = 0;
		for(int i=0 ; i<arrayC.length;i++) {
			if(flag == 1) {
				temp = 1;
				flag = 0;
			}
			else temp = 0 ;
			temp+=arrayA[i];
			temp+=arrayB[i];
			if(temp>=10) {
				temp-=10;
				flag = 1;
			}
			arrayC[i]=temp;
		}
		StringBuilder s = new StringBuilder();
		flag = 1;
		for(int i=arrayC.length-1;i>=0;i--){
			if(arrayC[i]==0&&flag==1){
				flag = 0;
				continue;
			}
			else flag=0;
			s.append(arrayC[i]);
		}
		return s.toString();
	}
	public static void main(String args[]) {
		String a,b;
		System.out.println("请输入需要相加的两个数");
		Scanner reader = new Scanner (System.in);
		a = reader.nextLine();
		b = reader.nextLine();
		System.out.println(NumberSum(a,b));
	}
}

算法参考微信公众号：程序员小灰