なぜC#にはthrowsがないのか?
http://onigiri.s3.xrea.com:8080/csharp/index.php?%5B%5B%BD%A1%B6%B5%CF%C0%C1%E8%2F%A4%CA%A4%BCthrows%28%29%A4%AC%A4%CA%A4%A4%A4%CE%A4%AB%5D%5D