import java.io.*；
class sum
{
public static void main(String args[])
{
DatalnputStream fis=null；
try
{
fis=new DataInputStream(new FileInputStream("myfile.txt"));
//建立讀入"myfile.txt"文件的輸入流
String stra=fis.readln();
//讀入一個字符串
int a=Integer.parseInt(stra);
//把該字符串轉化為整數
String strb=fis.readln();
int b=Integer.parseInt(strb);
int c=a+b；
System.out.println(c.toString());
//輸出c
}
catch(FileNotFoundexception e)
{
System.out.printIn(e.toString());
}
catch(IOException e)
{
System.out.println(e.toString());
}
catch(NumberFormatException e)
{
System.out.println(e.toString());
}
finally
{
if(fis= =null)
{
System.out.println("DateInputStream not open!")
//輸入流沒有打開
}
else
{
fis.close()；
關閉輸入流
System.out.println("Close DalaInStream!");
    }
}
}
}