Revert "BAEL-4134"

core-java-modules/core-java-networking-2/src/main/java/com/baeldung/macaddress/GetAllMacAddressesDemo.java

@@ -0,0 +1,23 @@
+package com.baeldung.macaddress;
+
+import java.net.NetworkInterface;
+import java.net.SocketException;
+import java.util.Enumeration;
+
+public class GetAllMacAddressesDemo {
+
+    public static void main(String[] args) throws SocketException {
+        Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
+        while (networkInterfaces.hasMoreElements()) {
+            NetworkInterface ni = networkInterfaces.nextElement();
+            byte[] hardwareAddress = ni.getHardwareAddress();
+            if (hardwareAddress != null) {
+                String[] hexadecimalFormat = new String[hardwareAddress.length];
+                for (int i = 0; i < hardwareAddress.length; i++) {
+                    hexadecimalFormat[i] = String.format("%02X", hardwareAddress[i]);
+                }
+                System.out.println(String.join("-", hexadecimalFormat));
+            }
+        }
+    }
+}

core-java-modules/core-java-networking-2/src/test/java/com/baeldung/macaddress/MacAddressUnitTest.java

@@ -0,0 +1,21 @@
+package com.baeldung.macaddress;
+
+import org.junit.Test;
+
+import java.net.InetAddress;
+import java.net.NetworkInterface;
+import java.net.SocketException;
+import java.net.UnknownHostException;
+
+import static org.junit.Assert.assertEquals;
+
+public class MacAddressUnitTest {
+
+    @Test
+    public void givenNetworkInterface_whenUsingLocalHost_thenGetMacAddress() throws UnknownHostException, SocketException {
+        InetAddress localHost = InetAddress.getLocalHost();
+        NetworkInterface ni = NetworkInterface.getByInetAddress(localHost);
+        byte[] macAddress = ni.getHardwareAddress();
+        assertEquals(6, macAddress.length);
+    }
+}