8258514: Replace Collections.unmodifiableList with List.of

Reviewed-by: jnimeh

Author: XueleiFan

src/java.base/share/classes/sun/security/ssl/AlpnExtension.java

@@ -85,8 +85,7 @@ static final class AlpnSpec implements SSLExtensionSpec {
         final List<String> applicationProtocols;
 
         private AlpnSpec(String[] applicationProtocols) {
-            this.applicationProtocols = Collections.unmodifiableList(
-                    Arrays.asList(applicationProtocols));
+            this.applicationProtocols = List.of(applicationProtocols);
         }
 
         private AlpnSpec(HandshakeContext hc,

src/java.base/share/classes/sun/security/ssl/SSLSessionImpl.java

@@ -198,8 +198,7 @@ final class SSLSessionImpl extends ExtendedSSLSession {
                 Collections.unmodifiableCollection(
                         new ArrayList<>(hc.localSupportedSignAlgs));
         this.serverNameIndication = hc.negotiatedServerName;
-        this.requestedServerNames = Collections.unmodifiableList(
-                new ArrayList<>(hc.getRequestedServerNames()));
+        this.requestedServerNames = List.copyOf(hc.getRequestedServerNames());
         if (hc.sslConfig.isClientMode) {
             this.useExtendedMasterSecret =
                 (hc.handshakeExtensions.get(

src/java.base/share/classes/sun/security/ssl/ServerNameExtension.java

@@ -89,8 +89,7 @@ static final class CHServerNamesSpec implements SSLExtensionSpec {
          * (see JDK-6323374).
          */
         private CHServerNamesSpec(List<SNIServerName> serverNames) {
-            this.serverNames = Collections.<SNIServerName>unmodifiableList(
-                    new ArrayList<>(serverNames));
+            this.serverNames = List.copyOf(serverNames);
         }
 
         private CHServerNamesSpec(HandshakeContext hc,