java写a+b problem（多组测试数据）

import java.util.Scanner;
public class Main{
   public static void main(String[] args){
      Scanner in = new Scanner(System.in);
      while(in.hasNext()){	
      int a=in.nextInt();
      int b=in.nextInt();
      System.out.println(a+b);
    }
  }
}