/为什么输不出正确的int型？求答复！谢谢！

import java.io.*;

public class Hello
{
    public static void main(String [] args)
    {
        DataInputStream d
        = new DataInputStream(new BufferedInputStream(System.in));
        int s;
        try{
            s = d.readInt();
            System.out.println(s);
            int b = d.readInt();
            System.out.println(b);
            int sum = s + b;
            System.out.println(sum);
        }catch(IOException e)
        {
            e.printStackTrace();
        }
    }
}

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