Find maximum, minimum, sum and average of a list in Java 8

Question

How to find the maximum, minimum, sum and average of the numbers in the following list in Java 8?

List primes = Arrays.asList(2, 3, 5, 7, 11,          


        

Answer 1

    //By using lambda
    int sum = primes.stream().mapToInt(a->a).sum();
    System.out.println(sum);
    int min = primes.stream().mapToInt(a->a).min().orElse(0);
    System.out.println(min);
    int max = primes.stream().mapToInt(a->a).max().orElse(0);
    System.out.println(max);
    double average = primes.stream().mapToInt(a->a).average().orElse(0);
    System.out.println(average);
    
    //By using Collections
    System.out.println(Collections.min(primes));
    System.out.println(Collections.max(primes));