小编atu*_*tul的帖子

class Account {
    val id = Account.newUniqueNumber()
    private var balance = 0.0
    def deposit(amount: Double) { balance += amount }
}

object Account {
    private var lastNumber = 0
    private def newUniqueNumber() {
        lastNumber += 1; lastNumber
    }
}

var a1 = new Account()
var a2 = new Account()
println(a1.id)
println(a2.id)

~/myScala % scala -version
Scala code runner version 2.9.1 -- Copyright 2002-2011, LAMP/EPFL
~/myScala % scala Account.scala
()
()
~/myScala %

我期待1,2作为输出...我的推理是......
1.构造一个新的Account对象
2.初始化id字段时,构建伴随对象(仅一次)

所以newUniqueNumber()调用应该返回1和2 ...

有什么指针吗？

谢谢..