diff --git a/test/jdk/java/nio/channels/DatagramChannel/AdaptorMulticasting.java b/test/jdk/java/nio/channels/DatagramChannel/AdaptorMulticasting.java
index 38b3051effa08..cab2bc7628562 100644
--- a/test/jdk/java/nio/channels/DatagramChannel/AdaptorMulticasting.java
+++ b/test/jdk/java/nio/channels/DatagramChannel/AdaptorMulticasting.java
@@ -402,10 +402,6 @@ static void testLoopbackMode(MulticastSocket s) throws IOException {
                      () -> s.setOption((SocketOption) IP_MULTICAST_LOOP, "badValue"));
     }
 
-    static int getPort(SocketAddress address) {
-        return ((InetSocketAddress) address).getPort();
-    }
-
     /**
      * Send a datagram to the given multicast group and check that it is received.
      */
@@ -427,10 +423,10 @@ static void testSendReceive(MulticastSocket s, InetAddress group) throws IOExcep
 
         // receive message
         s.setSoTimeout(0);
-        do {
+        while (true) {
             p = new DatagramPacket(new byte[1024], 100);
             s.receive(p);
-            if (getPort(p.getSocketAddress()) == getPort(s.getLocalSocketAddress())) {
+            if (p.getPort() == s.getLocalPort()) {
                 String str = new String(p.getData(), p.getOffset(), p.getLength(), "UTF-8");
                 if (Arrays.equals(p.getData(), p.getOffset(), p.getLength(), message, 0, message.length)) {
                     System.out.format("Got expected message \"%s\" from %s%n", str, p.getSocketAddress());
@@ -442,7 +438,7 @@ static void testSendReceive(MulticastSocket s, InetAddress group) throws IOExcep
                 System.out.println("Unexpected message received. Expected message from: " + s.getLocalAddress());
                 System.out.println("Received message sender doesn't match - skipping: " + p.getSocketAddress());
             }
-        } while(true);
+        }
 
         assertTrue(p.getLength() == message.length);
         assertTrue(p.getPort() == s.getLocalPort());
diff --git a/test/jdk/java/nio/channels/DatagramChannel/Connect.java b/test/jdk/java/nio/channels/DatagramChannel/Connect.java
index 01c83df08cae6..41c172b33284d 100644
--- a/test/jdk/java/nio/channels/DatagramChannel/Connect.java
+++ b/test/jdk/java/nio/channels/DatagramChannel/Connect.java
@@ -118,6 +118,13 @@ public void run() {
                 ByteBuffer bb = ByteBuffer.allocateDirect(MAX);
                 bb.put(bytes);
                 bb.flip();
+                // When connecting an unbound datagram channel, the underlying
+                // socket will first be bound to the wildcard address. On macOS,
+                // the system may allocate the same port on which another socket
+                // is already bound with a more specific address. This may prevent
+                // datagrams directed at the connected socket to reach it.
+                // To avoid this, when on macOS, we preemptively bind `dc` to the
+                // specific address instead of letting it bind to the wildcard.
                 if (Platform.isOSX()) {
                     dc.bind(new InetSocketAddress(((InetSocketAddress)connectSocketAddress).getAddress(), 0));
                     err.println("Initiator bound to: " + connectSocketAddress);
diff --git a/test/jdk/java/nio/channels/DatagramChannel/NotBound.java b/test/jdk/java/nio/channels/DatagramChannel/NotBound.java
index 3249c503c7ba7..bcd73591bf967 100644
--- a/test/jdk/java/nio/channels/DatagramChannel/NotBound.java
+++ b/test/jdk/java/nio/channels/DatagramChannel/NotBound.java
@@ -109,7 +109,7 @@ public static void main(String[] args) throws IOException {
         // connect
         dc = DatagramChannel.open();
         try {
-            System.out.println("Checks that connect() binds the socket");
+            System.out.println("Check that connect() binds the socket");
             try (DatagramChannel peer = DatagramChannel.open()) {
                 peer.bind(new InetSocketAddress(0));
                 int peerPort = ((InetSocketAddress)(peer.getLocalAddress())).getPort();
@@ -123,7 +123,7 @@ public static void main(String[] args) throws IOException {
         // send
         dc = DatagramChannel.open();
         try {
-            System.out.println("Checks that send() binds the socket");
+            System.out.println("Check that send() binds the socket");
             ByteBuffer bb = ByteBuffer.wrap("NotBound: ignore this".getBytes());
             SocketAddress target =
                 new InetSocketAddress(InetAddress.getLocalHost(), 5000);
@@ -136,7 +136,7 @@ public static void main(String[] args) throws IOException {
         // receive (blocking)
         dc = DatagramChannel.open();
         try {
-            System.out.println("Checks that blocking receive() binds the socket");
+            System.out.println("Check that blocking receive() binds the socket");
             ByteBuffer bb = ByteBuffer.allocateDirect(128);
             wakeupWhenBound(dc);
             SocketAddress sender = dc.receive(bb);
@@ -151,7 +151,7 @@ public static void main(String[] args) throws IOException {
         // receive (non-blocking)
         dc = DatagramChannel.open();
         try {
-            System.out.println("Checks that non-blocking receive() binds the socket");
+            System.out.println("Check that non-blocking receive() binds the socket");
             dc.configureBlocking(false);
             ByteBuffer bb = ByteBuffer.allocateDirect(128);
             SocketAddress sender = dc.receive(bb);