java获取键盘输入流

import java.io.*;import java.util.*;import java.util.Map.Entry;public class Main{    public static void main(String args[])    {        Scanner cin = new Scanner(System.in);        int a = 0, b = 0;               while(cin.hasNextInt())        {                a = cin.nextInt();        b = cin.nextInt();        System.out.println("a + b = "+ (a+b));        }            }}