public class GetMaxMinSumAverage
1: //GetMaxMinSumAverage.java
3: import java.util.Arrays;
4: import java.util.IntSummaryStatistics;
5: import java.util.List;
7: public class GetMaxMinSumAverage
8: {
9: public static void main(String args[])
10: {
11: //We will find the maximum, minimum, sum and average of
12: //a list of integers.
13: List<Integer> integers
14: = Arrays.asList(2, 1, 13, 4, 15, 6, 19, 17, 8);
15: System.out.println("\nList of integers: " + integers);
17: System.out.println("\n=============");
18: System.out.println("Using Java 7: ");
19: int max = integers.get(0);
20: int min = integers.get(0);
21: int sum = integers.get(0); //Note this initialization!
22: for (int i = 1; i < integers.size(); i++)
23: {
24: Integer integer = integers.get(i);
25: if (integer.intValue() > max)
26: {
27: max = integer.intValue();
28: }
29: if (integer.intValue() < min)
30: {
31: min = integer.intValue();
32: }
33: sum += integer;
34: }
35: double average = (double) sum / integers.size();
36: System.out.println("Highest number in List: " + max);
37: System.out.println("Lowest number in List: " + min);
38: System.out.println("Sum of all numbers: " + sum);
39: System.out.println("Average of all numbers: " + average);
41: System.out.println("\n=============");
42: System.out.println("Using Java 8: ");
43: IntSummaryStatistics stats = integers
44: .stream()
45: .mapToInt(x -> x) //That is, from Integer to int
46: .summaryStatistics();
47: System.out.println("Highest number in List: " + stats.getMax());
48: System.out.println("Lowest number in List: " + stats.getMin());
49: System.out.println("Sum of all numbers: " + stats.getSum());
50: System.out.println("Average of all numbers: " + stats.getAverage());
51: }
52: }
53: /* Output:
55: List of integers: [2, 1, 13, 4, 15, 6, 19, 17, 8]
57: =============
58: Using Java 7:
59: Highest number in List: 19
60: Lowest number in List: 1
61: Sum of all numbers: 85
62: Average of all numbers: 9.444444444444445
64: =============
65: Using Java 8:
66: Highest number in List: 19
67: Lowest number in List: 1
68: Sum of all numbers: 85
69: Average of all numbers: 9.444444444444445
70: */