fix: lint errors

Author: hamzamahmood

src/main/java/io/apimatic/core/configurations/http/client/CoreHttpClientConfiguration.java

@@ -141,13 +141,15 @@ public final class CoreHttpClientConfiguration implements ClientConfiguration {
      * @param shouldRetryOnTimeout
      * @param httpClientInstance
      * @param overrideHttpClientConfigurations
+     * @param proxyConfiguration
      */
     private CoreHttpClientConfiguration(final long timeout, final int numberOfRetries,
             final int backOffFactor, final long retryInterval,
             final boolean skipSslCertVerification, final Set<Integer> httpStatusCodesToRetry,
             final Set<Method> httpMethodsToRetry, final long maximumRetryWaitTime,
             final boolean shouldRetryOnTimeout, final okhttp3.OkHttpClient httpClientInstance,
-            final boolean overrideHttpClientConfigurations, final ProxyConfiguration proxyConfiguration) {
+            final boolean overrideHttpClientConfigurations,
+            final ProxyConfiguration proxyConfiguration) {
         this.timeout = timeout;
         this.numberOfRetries = numberOfRetries;
         this.backOffFactor = backOffFactor;
@@ -254,8 +256,7 @@ public boolean skipSslCertVerification() {
     /**
      * Returns the proxy configuration used to route requests through a proxy server.
      * This includes the proxy address, port, and any authentication credentials.
-     *
-     * @return the {@link ProxyConfiguration}, or {@code null} if no proxy is configured
+     * @return the {@link ProxyConfiguration}
      */
     public ProxyConfiguration getProxyConfiguration() { return proxyConfiguration; }
 

src/main/java/io/apimatic/core/configurations/http/client/CoreProxyConfiguration.java

@@ -6,7 +6,7 @@
  * Represents a proxy configuration with address, port, and optional authentication credentials.
  * This class is an implementation of the {@link ProxyConfiguration} interface.
  */
-public class CoreProxyConfiguration implements ProxyConfiguration {
+public final class CoreProxyConfiguration implements ProxyConfiguration {
 
     /**
      * The proxy server address (e.g., IP or domain name).
@@ -37,7 +37,8 @@ public class CoreProxyConfiguration implements ProxyConfiguration {
      * @param username The username for proxy authentication (can be {@code null}).
      * @param password The password for proxy authentication (can be {@code null}).
      */
-    private CoreProxyConfiguration(String address, int port, String username, String password) {
+    private CoreProxyConfiguration(final String address, final int port,
+      final String username, final String password) {
         this.address = address;
         this.port = port;
         this.username = username;
@@ -80,12 +81,12 @@ public Builder newBuilder() {
      */
     @Override
     public String toString() {
-        return "CoreProxyConfiguration [" +
-          "address=" + address +
-          ", port=" + port +
-          ", username=" + (username != null ? username : "null") +
-          ", password=" + (password != null ? password : "null") +
-          "]";
+        return "CoreProxyConfiguration ["
+          + "address=" + address
+          + ", port=" + port
+          + ", username=" + username
+          + ", password=" + password
+          + "]";
     }
 
     /**
@@ -98,7 +99,13 @@ public static class Builder {
         private String username;
         private String password;
 
-        public Builder(String address, int port) {
+        /**
+         * Creates a new {@code Builder} instance with the specified proxy server details.
+         *
+         * @param address the hostname or IP address of the proxy server
+         * @param port    the port number of the proxy server
+         */
+        public Builder(final String address, final int port) {
             this.address = address;
             this.port = port;
         }
@@ -131,4 +138,4 @@ public CoreProxyConfiguration build() {
             return new CoreProxyConfiguration(address, port, username, password);
         }
     }
-}
+}