feat: add unnamed variable example

Author: claudioaltamura

README.md

@@ -9,4 +9,5 @@ Java 25 features examples
 - instance main method
 - module import declarations
 - flexible constructor bodies
-- markdown documentation
+- markdown documentation
+- unnamed variables

src/main/java/de/claudioaltamura/java25/unnamed/DBOperations.java

@@ -0,0 +1,22 @@
+package de.claudioaltamura.java25.unnamed;
+
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.logging.Logger;
+
+public class DBOperations {
+    private static final Logger logger = Logger.getLogger(DBOperations.class.getName());
+    void checkConnection(String url, String user, String pwd) {
+        try (var _ = DriverManager.getConnection(url, user, pwd)) {
+            var msg = """
+                        DB Connection successful
+                        URL = {%s}
+                        usr = {%s}
+                        pwd = {%s}
+                        """.formatted(url, user, pwd);
+            logger.info(msg);
+        } catch (SQLException e) {
+            logger.warning(e.toString());
+        }
+    }
+}