Question 9: Given a list of numbers, square them and filter the numbers which are greater 10000 and then find average of them.( Java 8 APIs only)

You can use the map function to square the number and then filter to avoid numbers which are less than 10000.We will use average as terminating function in this case.

 import java.util.Arrays;
import java.util.List;
import java.util.OptionalDouble;
 
public class RemoveDuplicatesFromListMain {
    public static void main(String[] args)
    {
        Integer[] arr=new Integer[]{100,24,13,44,114,200,40,112};
        List<Integer> list = Arrays.asList(arr);
        OptionalDouble average = list.stream()
                                 .mapToInt(n->n*n)
                                 .filter(n->n>10000)
                                 .average();
 
        if(average.isPresent())
            System.out.println(average.getAsDouble());
 
    }
}
 

output:

21846.666666666668

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