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JAVA ADVANCED/12. Exercise Functional Programming/P04_AppliedArithmetics.java

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+import java.util.Arrays;
+import java.util.List;
+import java.util.Scanner;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+public class P04_AppliedArithmetics {
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        Function<List<Integer>, List<Integer>> add = list -> list.stream()
+                .map(e -> e + 1)
+                .collect(Collectors.toList());
+
+        Function<List<Integer>, List<Integer>> multiply = list -> list.stream()
+                .map(e -> e * 2)
+                .collect(Collectors.toList());
+
+        Function<List<Integer>, List<Integer>> subtract = list -> list.stream()
+                .map(e -> e - 1)
+                .collect(Collectors.toList());
+
+
+        List<Integer> numbers = Arrays.stream(scanner.nextLine().split("\\s+"))
+                .map(Integer::parseInt)
+                .collect(Collectors.toList());
+
+        String line;
+        while (!"end".equals(line = scanner.nextLine())) {
+
+            switch (line) {
+                case "add":
+                    numbers = add.apply(numbers);
+                    break;
+                case "multiply":
+                    numbers = multiply.apply(numbers);
+                    break;
+                case "subtract":
+                    numbers = subtract.apply(numbers);
+                    break;
+                default:
+                    numbers.forEach(e -> System.out.print(e + " "));
+                    System.out.println();
+                    break;
+            }
+        }
+
+    }
+}