sum returns int - no need getAsInt()

Week 7: Enum, Generic Type, Streams, write to file, class diagram/09B. Sum, Average, Minimum, Maximum+++

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+Write a program that asks the 'user to enter integers'. 
+The program stores the numbers in a 'list of integers'.
+
+When the user enters the 'number -1', the program execution 'ends', 
+and it prints the sum, average, minimum, and maximum of all the numbers entered (before -1).
+
+
+Use streams to calculate the values!
+
+
+
+
+Example execution:
+Enter a number: 1
+Enter a number: 2
+Enter a number: 3
+Enter a number: -1
+Sum: 6
+Average: 2.0
+Minimum: 1
+Maximum: 3
+
+
+
+    
+import java.util.Random;
+import java.util.ArrayList;
+import java.util.Scanner;
+
+
+
+public class Test {
+    public static void main(String[] args) {
+        final Random r = new Random();
+        
+
+    // ADD
+    // USER INPUTS INTEGERS
+    ArrayList<Integer> numbers = new ArrayList<>();
+    Scanner reader = new Scanner(System.in);
+    while (true) {
+        System.out.print("Give a number: ");
+        int number = Integer.valueOf(reader.nextLine());
+
+        if (number == -1) {
+            break;
+        }
+        numbers.add(number);
+    }
+    
+
+    // SUM AVG MIN MAX
+    if (!numbers.isEmpty()) {
+        // sum() method returns an int, so no need to getAsInt()
+        System.out.println("Sum: " + numbers.stream().mapToInt(num -> num).sum());
+        System.out.println("Average: " + numbers.stream().mapToInt(num -> num).average().getAsDouble());
+        System.out.println("Minimum: " + numbers.stream().mapToInt(num -> num).min().getAsInt());
+        System.out.println("Maximum: " + numbers.stream().mapToInt(num -> num).max().getAsInt());
+    }
+}
+
+
+
+Test number 1
+Give a number: 2
+Give a number: 3
+Give a number: 4
+Give a number: 5
+Give a number: -1
+Sum: 14
+Average: 3.5
+Minimum: 2
+Maximum: 5
+
+Test number 2
+Give a number: 10
+Give a number: 12
+Give a number: 14
+Give a number: 16
+Give a number: -1
+Sum: 52
+Average: 13.0
+Minimum: 10
+Maximum: 16
+
+Test number 3
+Give a number: 9
+Give a number: 7
+Give a number: 5
+Give a number: 3
+Give a number: -1
+Sum: 24
+Average: 6.0
+Minimum: 3
+Maximum: 9
+
+Test number 4
+Give a number: 100
+Give a number: 103
+Give a number: 107
+Give a number: 99
+Give a number: -1
+Sum: 409
+Average: 102.25
+Minimum: 99
+Maximum: 107
+
+