In this example, we will see “How to calculate average of marks in Java 8?”. To achieve that, we are going to use Stream API introduced in Java 8 to find average and we will see it through several different ways.
Java 8 programs to calculate average of marks...!!! Share on X
Example 1. Java 8 code to find average of marks using List
import java.util.Arrays;
import java.util.List;
import java.util.OptionalDouble;
/**
* To calculate average of marks using list in Java 8
*
* @author D.V
*
*/
public class Calculate_Average_Marks_List_Of_Integers_Java8 {
public static void main(String[] args) {
List <Integer> listOfMarks = Arrays.asList(20, 50, 99, 12, 94);
OptionalDouble averageOfMarks = listOfMarks
.stream()
.mapToInt(number -> number.intValue())
.average();
System.out.println("Average of Marks: " + averageOfMarks);
}
}
Output:
Average of Marks: OptionalDouble[55.0]
Example 2. Java 8 code to find average of marks using Array
import java.util.Arrays;
import java.util.OptionalDouble;
import java.util.stream.IntStream;
/**
* To calculate average of marks using Array in Java 8
*
* @author D.V
*
*/
public class Calculate_Average_Marks_Array_Of_Integers_Java8 {
public static void main(String[] args) {
int[] arr = new int[10];
arr[0] = 20;
arr[1] = 50;
arr[2] = 99;
arr[3] = 12;
arr[4] = 94;
arr[5] = 22;
arr[6] = 43;
arr[7] = 56;
arr[8] = 55;
arr[9] = 78;
IntStream streamOfMarks = Arrays.stream(arr);
OptionalDouble averageOfMarks = streamOfMarks.average();
System.out.println("Average of Marks: " + averageOfMarks);
}
}
Output:
Average of Marks: OptionalDouble[52.9]
Example 3. Java 8 code to find average of marks using Array with Scanner
import java.util.Arrays;
import java.util.OptionalDouble;
import java.util.Scanner;
import java.util.stream.IntStream;
/**
* To calculate average of marks using Array with Scanner in Java 8
*
* @author D.V
*
*/
public class Calculate_Average_Marks_Array_Of_Integers_Using_Scanner_Java8 {
private static Scanner scanner;
public static void main(String[] args) {
System.out.println("Enter how many marks you want to use to calculate the average");
scanner = new Scanner(System.in);
int number = scanner.nextInt();
int[] arr = new int[number];
System.out.println("\nEnter marks now\n");
for (int i = 0; i < number; i++) {
System.out.println("Enter marks of subject " + (i + 1) + ":");
arr[i] = scanner.nextInt();
}
IntStream streamOfMarks = Arrays.stream(arr);
OptionalDouble averageOfMarks = streamOfMarks.average();
System.out.println("\nAverage of Marks: " + averageOfMarks);
}
}
Output:
Enter how many marks you want to use to calculate the average 5 Enter marks now Enter marks of subject 1: 6 Enter marks of subject 2: 90 Enter marks of subject 3: 55 Enter marks of subject 4: 71 Enter marks of subject 5: 11 Average of Marks: OptionalDouble[46.6]
Java 8 programs to calculate average of marks...!!! Share on X
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