我正在使用带有 Scala的 Kaggle 数据集进行一些探索性分析。我要做的一件事是为一个名为“Taxpayer”的案例类创建一个伴随对象,如下所示:
case class Taxpayer(
age: Int,
workclass: String,
education: String,
educationNum: Int,
maritalStatus: String,
occupation: String,
relationship: String,
race: String,
sex: String,
capitalGain: Int,
capitalLoss: Int,
hoursPerWeek: Int,
nativeCountry: String,
income: String
)
给定这个案例类,我必须创建一个伴随对象并定义以下函数:
- printData:打印以下格式“$workclass - $occupation - $nativeCountry - $income”
- apply:不接受任何参数并返回具有 Int fields = -1 和 String fields = "unknown" 的类 Taxpayer 的实例
我尝试了以下方法,但它不起作用(“预期的类或对象定义”):
object Taxpayer{
def printData(c: Taxpayer) = {
println(s"${c.workclass} - ${c.occupation} - ${c.nativeCountry} - ${c.income}")
def apply(age: Int = -1, workclass: String = "unknown", education: "unknown", educationNum: Int = -1, maritalStatus: "unknown",
occupation: "unknown", relationship: "unknown", race: "unknown", sex: "unknown", capitalGain: Int = -1,
capitalLoss: Int = -1, hoursPerWeek: Int = -1, nativeCountry: "unknown", income: "unknown") = {
new Taxpayer(age, workclass, education, educationNum, maritalStatus, occupation, relationship,
race, sex, capitalGain, capitalLoss, hoursPerWeek, nativeCountry, income)
}
}
}
如何定义一个适用于我的数据集行的函数?先感谢您!:)