added java implementation

upperdim · upperdim · commit 476e4cc1d25a · 2022-08-14T15:47:18.000+03:00
diff --git a/FunctionPointerDemo.java b/FunctionPointerDemo.java
@@ -0,0 +1,24 @@
+interface FunctionWrapper {
+	int methodSignature(int n);
+}
+
+public class FunctionPointerDemo {
+	static int increment(int n) {
+		return n + 1;
+	}
+
+	static void myObjective(int[] arr, FunctionWrapper f) {
+		for (int i = 0; i < arr.length; ++i)
+			arr[i] = f.methodSignature(arr[i]);
+	}
+
+	public static void main(String[] args) {
+		int[] arr = {0, 1, 2 ,3 ,4};
+
+		FunctionWrapper functionPointer = FunctionPointerDemo::increment;
+		myObjective(arr, functionPointer);
+
+		for (int elem : arr)
+			System.out.print(elem + " ");
+	}
+}
