Scala 学习笔记

class Rational(n: Int, d: Int) {
　　require(d != 0)
　　override def toString = n +"/"+ d
}
The require method takes one boolean parameter. If the passed value is
true, require will return normally. Otherwise, require will prevent the ob-
ject from being constructed by throwing an IllegalArgumentException .

Scala 学习笔记,布布扣,bubuko.com

Scala 学习笔记

原文：http://www.cnblogs.com/briller/p/3725768.html