[refactor] Use pattern Variable of Java14

Author: dizzzz

extensions/expath/src/test/java/org/expath/exist/HttpClientTest.java

@@ -81,8 +81,7 @@ private boolean hasInternetAccess() {
         try {
             final URL url = new URL("http://www.exist-db.org");
             final URLConnection con = url.openConnection();
-            if (con instanceof HttpURLConnection) {
-                final HttpURLConnection httpConnection = (HttpURLConnection) con;
+            if (con instanceof HttpURLConnection httpConnection) {
                 hasInternetAccess = (httpConnection.getResponseCode() == HttpURLConnection.HTTP_OK);
             }
         } catch(final MalformedURLException e) {

extensions/modules/file/src/test/java/org/exist/xquery/modules/file/EmbeddedBinariesTest.java

@@ -143,8 +143,7 @@ protected boolean isBooleanType(final Item item) throws IOException {
 
     @Override
     protected byte[] getBytes(final Item item) throws IOException {
-        if (item instanceof Base64BinaryDocument) {
-            final Base64BinaryDocument doc = (Base64BinaryDocument) item;
+        if (item instanceof Base64BinaryDocument doc) {
             try (final UnsynchronizedByteArrayOutputStream baos = new UnsynchronizedByteArrayOutputStream()) {
                 doc.streamBinaryTo(baos);
                 return baos.toByteArray();

extensions/modules/sql/src/test/java/org/exist/xquery/modules/sql/ImplicitConnectionCloseIT.java

@@ -247,8 +247,7 @@ public static class StubDataSourceFactory implements ObjectFactory {
 
         @Override
         public Object getObjectInstance(final Object obj, final Name name, final Context nameCtx, final Hashtable<?, ?> environment) throws Exception {
-            if (obj instanceof Reference) {
-                final Reference reference = (Reference)obj;
+            if (obj instanceof Reference reference) {
                 if (reference.getClassName().equals(StubDataSource.class.getName())) {
                     final StubDataSource dataSource = new StubDataSource();
                     dataSource.setURL((String)reference.get("url").getContent());