sweet swift Return function : wish in Java

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import UIKit
import Darwin


func average(nums: Int...) -> Double {
    var sum = 0
    
    for num in nums {
        sum += num
    }
    return Double(sum) / Double (nums.count)
}

func sum(nums: Int...) -> Double {
    var sum = 0
    
    for num in nums {
        sum += num
    }
    return Double(sum)
}

func doMath(mathOp: String)-> (Int...)->Double{
    if mathOp == "average" {
        return average
    }else{
        return sum
    }
}

var mathFunc = doMath(mathOp: "average")

print(mathFunc(1,3,4,5,6,78,67,5,4,4,9))

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