8330815: Use pattern matching for instanceof in KeepAliveCache

Backport-of: ddecbe52018fdb7556b04b20e8529eb430d3aa75

src/java.base/share/classes/sun/net/www/http/KeepAliveCache.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1996, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 2024, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -407,9 +407,9 @@ public KeepAliveKey(URL url, Object obj) {
      */
     @Override
     public boolean equals(Object obj) {
-        if ((obj instanceof KeepAliveKey) == false)
+        if (!(obj instanceof KeepAliveKey kae))
             return false;
-        KeepAliveKey kae = (KeepAliveKey)obj;
+
         return host.equals(kae.host)
             && (port == kae.port)
             && protocol.equals(kae.protocol)
@@ -423,7 +423,7 @@ public boolean equals(Object obj) {
     @Override
     public int hashCode() {
         String str = protocol+host+port;
-        return this.obj == null? str.hashCode() :
+        return this.obj == null ? str.hashCode() :
             str.hashCode() + this.obj.hashCode();
     }
 }