The syntax for using an upper bound is as follows:
GenericType
import java.util.ArrayList;
import java.util.List;
public class MainClass {
public static double getAverage(List numberList) {
double total = 0.0;
for (Number number : numberList) {
total += number.doubleValue();
}
return total / numberList.size();
}
public static void main(String[] args) {
List integerList = new ArrayList();
integerList.add(3);
integerList.add(30);
integerList.add(300);
System.out.println(getAverage(integerList)); // 111.0
List doubleList = new ArrayList();
doubleList.add(3.0);
doubleList.add(33.0);
System.out.println(getAverage(doubleList)); // 18.0
}
}
111.0
18.0