A+Bproblem(JAVA)

package package1;import java.util.Scanner;public class FirstClass {    int a,b;    public static void main(String[] args) {        FirstClass fr = new FirstClass();        fr.SetANDSum(fr.a,fr.b);    }    public void SetANDSum(int aa,int bb)    {        Scanner sc=new Scanner(System.in);        while(sc.hasNext())//只要有输入就继续循环。。。只是我不知道怎么退出来        {        aa=sc.nextInt();        bb=sc.nextInt();        a=aa;        b=bb;        int sum=0;        sum=aa+bb;        System.out.println(sum);        }    }}