finally found a better java implementation in exchange of primitive types

upperdim · upperdim · commit bd75c55b97b3 · 2023-03-13T01:10:55.000+03:00
diff --git a/FunctionPointerDemo2.java b/FunctionPointerDemo2.java
@@ -0,0 +1,22 @@
+import java.util.function.Function;
+
+public class FunctionPointerDemo2 {
+    static Integer increment(Integer n) {
+        return n + 1;
+    }
+
+    static void myObjective(Integer[] arr, Function<Integer, Integer> f) {
+        for (int i = 0; i < arr.length; ++i) {
+            arr[i] = f.apply(arr[i]);
+        }
+    }
+
+    public static void main(String[] args) {
+        Integer[] arr = {0, 1, 2, 3, 4};
+        myObjective(arr,  FunctionPointerDemo2::increment);
+
+        for (Integer elem : arr) {
+            System.out.print(elem + " ");
+        }
+    }
+}
