Demonstration of code that doesn't follow standard

core/sdk-core/src/main/java/software/amazon/awssdk/core/FooBarConfiguration.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ * or in the "license" file accompanying this file. This file is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+package software.amazon.awssdk.core;
+
+import java.util.List;
+import java.util.Optional;
+import software.amazon.awssdk.annotations.Immutable;
+import software.amazon.awssdk.annotations.SdkPublicApi;
+
+
+@Immutable
+@SdkPublicApi
+public final class FooBarConfiguration {
+
+    private final String foo;
+    private final List<String> bar;
+    private Optional<String> optionalField;
+
+    private FooBarConfiguration(Builder builder) {
+        this.foo = builder.foo;
+        this.bar = builder.bar;
+        this.optionalField = builder.optionalField;
+    }
+
+    /**
+     * Returns the foo configuration value.
+     *
+     * @return The foo value, if present.
+     */
+    public Optional<String> foo() {
+        return Optional.ofNullable(foo);
+    }
+
+    /**
+     * Returns the bar configuration value.
+     *
+     * @return The bar value, if present.
+     */
+    public Optional<List<String>> bar() {
+        return Optional.ofNullable(bar);
+    }
+
+    /**
+     * Create a new builder for {@link FooBarConfiguration}.
+     *
+     * @return A new builder instance.
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Builder for {@link FooBarConfiguration}.
+     */
+    public static final class Builder {
+        private Optional<String> optionalField;
+        private String foo;
+        private List<String> bar;
+
+        private Builder() {
+        }
+
+        public Builder foo(String foo) {
+            this.foo = foo;
+            return this;
+        }
+
+        public Builder bar(List<String> bar) {
+            this.bar = bar;
+            return this;
+        }
+
+        public Builder optionalField(Optional<String> optionalField) {
+            this.optionalField = optionalField;
+            return this;
+        }
+
+        /**
+         * Build a new {@link FooBarConfiguration} with the properties set on this builder.
+         *
+         * @return The new {@code FooBarConfiguration}.
+         */
+        public FooBarConfiguration build() {
+            return new FooBarConfiguration(this);
+        }
+    }
+}