changed the file structure

Code/Steiner/swapArray/src/App.java

@@ -0,0 +1,33 @@
+import java.util.Scanner;
+
+public class App {
+    public static void main(String[] args) {
+        String[] namen = { "Gian", "Leotrim", "Kevin", "Marco" };
+
+        print(namen);
+        swapArrayPosi(namen, 0, 4);
+        swapArrayPosi(namen, 1, 2);
+
+        System.out.println("Print after the switch:");
+        System.out.println("-----------------");
+
+        print(namen);
+    }
+
+    public static void swapArrayPosi(String[] namen, int numberOne, int numberTwo) {
+        if (numberOne < 0 || numberOne >= namen.length || numberTwo < 0 || numberTwo >= namen.length) {
+            System.out.println("Error: Invalid indices for array swap.");
+        } else {
+            String placeholderString = namen[numberOne];
+            namen[numberOne] = namen[numberTwo];
+            namen[numberTwo] = placeholderString;
+        }
+    }
+
+    public static void print(String[] namen) {
+        for (int i = 0; i < namen.length; i++) {
+            System.out.println(namen[i]);
+        }
+    }
+
+}