Variance code in Scala and its application in spark Code parsing Scala learning notes-40

Package Com.leegh.parameterization

/**
* @author Guohui Li
*/

Class Person
Class Student extends Person
Class C[+t] (Val args:t)

Trait Friend[-t] {
def makefriend (Somebody:t)
}
Object Variance {
def makefriendwithyou (S:student, f:friend[student]) {f.makefriend (s)}
def main (args:array[string]): Unit = {
Val Value:c[person] = new C[student] (new Student)
}

}

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Variance code in Scala and its application in spark Code parsing Scala learning notes-40