Java 21 record default value. 63 votes, 107 comments.

Java 21 record default value. Includes Java 21 examples, Lombok's @Builder, and best practices. In this article, we will explore some of the most essential developer’s friendly Java 21 new features with examples. Feb 4, 2025 · Learn how Java Record Patterns and Pattern Matching simplify data extraction and enhance switch expressions in Java 21. Default? Let's consider an example with properties object for new file creation. On the other hand, Lombok is a Java library that can auto-generate some known patterns as Java byte-code. If the type of the annotated parameter is List, Set or SortedSet then the resulting collection will have a single entry mapped from Dec 8, 2024 · From returning values directly and pattern-matching complex objects to handling nulls gracefully and enforcing exhaustive case handling, Java’s switch now offers developers greater flexibility Jan 25, 2024 · Java Scoped Values: Discover Java Scoped Values, ensuring secure and efficient thread-local data sharing in concurrent programming. Dec 6, 2024 · Learn how to master Java 17 Record Classes for creating customizable, user-friendly value objects with improved functionality and maintenance Nov 16, 2023 · Java records automatically handle default values for fields. Records are serializable. The goal is to have a 'data carrier' class without the traditional 'Java ceremony' (boilerplate). 12. Oct 21, 2021 · Before pattern matching, switch cases supported only simple testing of a selector expression that needs to match a constant value exactly. Apr 21, 2017 · Learn to use the Spring @Value annotation to configure fields from property files, system properties, etc. Default annotation in Java records is used to provide default values for fields when using the Builder pattern. By following these best practices, you can ensure that your Spring applications are robust, maintainable Sep 19, 2020 · Records, like lambdas and default methods on interfaces are tremendously useful language features because they enable many different patterns and uses beyond the obvious. Instead, you need to customize the builder class to set default values. records to default: import org. The basic steps that the code should carry out are as follows: Assign String a default value Run a method If the method returns a null/empty string le Oct 24, 2019 · If the id property is in fact a value, then yes. Apr 20, 2017 · You have two choices for setting the default value of an instance variable (sometimes called an "instance field"): Using an initializer on the declaration. Record classes, which are a special kind of class, help to model plain data aggregates with less ceremony than normal classes. Understanding these concepts is vital for effectively managing data serialization in Java applications. x Currently, using Java < 16 and Jackson, since records are not supported, the only way we have to serialize a Java object into JSON, is to use the Jackson object mapper, as follows: Let's create a simple PersonDTO class which has the following information: Nov 21, 2024 · Java 21, released in September 2024, introduces a host of exciting new features, performance improvements, and enhancements aimed at improving developer productivity, application performance, and language features. In this tutorial, we’ll explore several approaches to handling this scenario by using default values. 2. The default value of the property. Jul 31, 2018 · How would an annotation help with your goal of not hard-coding the default values? As I already mentioned, you can include a default value in your code by initialising the field with the desired default value. Aug 13, 2025 · 3. Hi all, I had a discussion back few days ago in the office and we realized that Java doesn’t have default argument values… 145K subscribers in the learnjava community. public record Account (Integer id, String login, Boolean blocked) {} public class Main { public static void main (String [] args) { Aug 21, 2025 · Learn how to write safer, cleaner code in Java 21 using sealed classes, pattern matching, and enhanced cryptography features. Integrate the custom configuration properties into your Spring Boot application by specifying the prefix and binding them from the application. Jan 24, 2025 · Define your custom configuration properties using Java records in the specified package. Records are very useful for creating small immutable objects. In simple words, we can auto-generate May 24, 2022 · I'm pulling my hair out here. Apply validation constraints to the fields of the records to ensure data integrity. Learn how to a leverage Java records for immutable configuration, Micronaut Data Mapped Entities and Projection DTOs Record classes can implement Serializable and receive treatment defined by the Java Object Serialization Specification, Section 1. Jan 23, 2020 · Records, great as DTO but it's not a replacement for Lombok Available in Java 17 LTS, Java Records were initially introduced in Java 14 as a new feature. As tempting as it might be to use records for data carrier objects, records are still a preview feature in Java. Sep 17, 2024 · Java avro default values: Learn how to set and manage default values in Java Avro schemas for efficient data serialization. The records feature is designed to enhance Java's ability to model "data as data". Java 8 brought lambdas, with lots of compelling uses for streams. You’ll find that records come with a default constructor and default values for components May 23, 2019 · Is there a way to add these default values when creating a new Record? So that this test will succeed? KampagneRecord record = new KampagneRecord(); assertTrue(record. The MongoDB URI is set in Heroku as an environment variable, and I access it in my application. public final class Record ex This BBE demonstrates the default values for record fields, adding default values to record fields, and default values in inclusions. class) void givenGuavaOptionalWhenNotNullThenReturnsDefault(String givenValue, String defaultValue) { How to model your immutable data with records to make your code simpler and more readable. Jan 8, 2024 · In this short tutorial, we’ll demonstrate the use of method overloading to simulate default parameters in Java. Deserializing Java records with Jackson can be straightforward, but handling optional fields and setting default values requires specific configurations. Definition Java Records automatically provide a canonical constructor, which is the default constructor for records. This is done by giving semantic meaning to data and providing a simple, compact syntax when working with data. By default, Java records automatically generate a constructor for you with parameters specifically set to match all fields. It is possible to use local record classes (since Java SE 15). It can also be helpful in avoiding bugs and improving code reliability. Learn how to handle null fields in Java with Jackson mapping, using default values effectively. Jan 11, 2022 · Java 16 introduces a new language feature called Records. 2 Code Example In this section, we will implement the employee management scenario using Java records and the RecordBuilder library. Unlike traditional classes, records automatically provide implementations for equals and hashCode, saving you time and reducing errors. This article provides a comprehensive overview of the most notable features of Java 21 and how you can leverage them with practical examples. public record User(String id, String name) { public User { Aug 7, 2017 · A quick and practical guide to setting default values when using the @Value annotation in Spring. Perfect for beginners and advanced users! Apr 14, 2020 · Learn what Java Records are, how you can create them, and why they simplify the way a POJO, DTO, or Value Object is created. No, the structure you found is how Java handles it, (that is, with overloading instead of default parameters). See full list on baeldung. The class itself is also made final by default, because immutability is not something that can be forced onto a subclass. key:my default value}") private String id; However, since you want just the default value and not to inject a value, @Value annotation is not what you want. Any declarations of the special handling methods discussed above are ignored for record types. This makes them a powerful tool for simplifying data structures in Java. Set<java. String> must have a non-empty default value. If the caller does not provide a value for these parameters, the default values are used instead. This can be achieved using the ternary operator along with a local variable initialized using the method `System. Jun 30, 2025 · In Java, unlike some other programming languages such as Python or JavaScript, there is no built - in support for default parameter values. Here, we say simulate because unlike certain other OOP languages (like C++ and Scala), the Java specification doesn’t support assigning a default value to a method parameter. This guide explains how to set values for properties in a Java 15 record and provides clear examples. This builder class possesses methods for defining each field and a build method to instantiate the record. What I would like to get as a default value is a empty Set. yml May 15, 2022 · A complete guide to creating value objects using Java Records with code examples Learn how to use Jackson to set default values for JSON attributes when they are null. Sep 1, 2023 · I have this: // the id-constructor-parameter should not exist // as the value should always be calculated within the constructor. In Java, you can streamline the assignment of a default value to a String by combining the initialization and null/empty check into one concise line. . Each property in a record is final and can only be assigned when the record is instantiated. Default annotation to my property and my object now looks like this @Data @Builder @NoArgsConstructor @AllArgsConstructor public class UserInfo { private int id; private String nick; @Builder. However, I am getting an error: org. To provide customized access to this attribute you are instead looking for an May 27, 2022 · You could override the record's getters to achieve some kind of default value logic: public record Foo(String requiredValue, Integer optionalValue) { @Override public Integer optionalValue() { return optionalValue == null ? 42 : optionalValue; } } When you want to provide default values for only some of the record's fields, this might be more convenient than overriding the canonical constructor. is completely based on this state of the records. Oct 2, 2023 · The article explores the evolution of the switch statement in Java, and using the new Java 21 features for finegrained pattern matching on nested records Mar 21, 2025 · Get creative with your records and remember that using Java 14 records doesn't have to lead to boilerplate code; default values can still be efficiently applied. fasterxml. Jun 20, 2024 · However, it doesn’t allow the default value to be supplied lazily. The last very brief discussion on it in the JDK dev lists (Amber in this case) looks like back in 2020, where it's fairly clear there's little interest in pursuing it at this stage - noting the risk of compatibility breaks Jan 22, 2024 · The upsides of using Java records Immutable by default: One of the key features of Java records is immutability. Use metadata annotations to provide default values and enhance IDE support. We explore the fundamental concept of the @Value annotation, provide a practical implementation guide, highlight common pitfalls and best practices, and discuss advanced usage scenarios. May 11, 2024 · Learn how to create a builder default property values using Lombok After the mapping with Jackson, all the fields that are not set in the JSON object will have a null value in Java. The Java SE 21 release introduces pattern matching for switch expressions and statements (JEP 441) as a permanent feature. Jul 17, 2023 · Scopes Values to the Rescue To mitigate the downsides associated with ThreadLocal<T>, a new type to efficiently store and share immutable data between multiple components was created alongside the other new concurrent-related modern Java features: ScopedValue<T>. We can instantiate records using the new keyword. properties file like t Learn how to set default values for fields with Lombok's @Builder and @Getter annotations in Java, including coding examples and common mistakes. The first expression you use will call a method/attribute on a bean called props, the one with the placeholder will try to locate a property named props. Apr 11, 2020 · I have a record and want to add default constructor to it. Overview @Value is the immutable variant of @Data; all fields are made private and final by default, and setters are not generated. This is when you have enough May 26, 2017 · With #{} it is an expression, with ${} it is a placeholder for a value. I have a Springboot project that is deployed in Heroku and connects to MongoDB. Records are a special purpose class to easily aggregate data in a shallowly immutable fashion. Like @Data, useful toString(), equals() and hashCode() methods are also generated, each field gets a getter method, and a constructor that Sep 14, 2025 · Master the Builder Design Pattern in Java using both the Classic and Fluent Builder approaches. Here you can find the official proposal: JEP 359 Records. When I try to use a Record as @ConfigurationProperties bean as follows I get the In Java 15, records are a new feature that allows developers to create immutable data classes easily. 5 days ago · Java Record Default Value：深入探索与实践 在Java编程中，记录（Record）是Java 14引入的一种紧凑语法，用于创建不可变的数据类。Record类在许多场景下都非常实用，它简化了数据类的创建过程，减少了样板代码。而理解和掌握Record的默认值设定，对于高效、准确地使用Record类至关重要。本文将深入探讨Java Jan 8, 2025 · After Java 17, Java 21 is the next LTS version. Dec 5, 2022 · Before java 16 you would use a class with a lombok value annotation, because records didn't exist yet (except in preview). isFPL in the Environment. If the title or director is null, default values are assigned. Aug 14, 2025 · Learn how Java records simplify string representations with auto-generated toString(). Is there a similar annotation to @NotNull that can tell Jackson to set a default value to a Java class member, in case it is null? Edit: To make the question more clear here is some code example. By the end of this article, you will have a solid understanding of what a Sep 30, 2022 · I have this simple configuration: @ConfigurationProperties("dummy") public record TestRecord(@DefaultValue Set<String> values, @DefaultValue("default") String one) { } This does not work and fails with : Parameter of type java. Jun 8, 2025 · Over recent Java versions, you might have noticed the introduction of the Java record class, a compact and immutable data carrier designed to simplify your code. Learn how to use Lombok's @Builder with default values in Java effectively. Jul 5, 2024 · Learn about the new features of Java 21, like record patterns and switch enhancements for cleaner code. jackson. Let‘s start with a basic example of how to create a Kafka consumer and leave the max. I want to use a Java record for my @ConfigurationProperties, providing default values to unspecified config properties. For instance, we have a record Rectangle: record Rectangle(double a, double b) { } And if I do need to specify the default values, how does that work for a union; do I need to specify default values for each schema in the union and how does that work in terms of order/syntax? Learn how to set default values in Java Lists, with practical examples, best practices, and troubleshooting tips. This new addition allows us to reduce boilerplate code when side effects are our only concern. Instead you could initialize the id in LookupDTO and Spring will replace it with incoming value. Sep 2, 2023 · 🔎 Java's support for default parameter values? Have you ever come across Java code that looks like it's missing something? 🤔 You may have stumbled upon a situation where default parameter values could come in handy. lang package is rare but necessary from time to time, such as Enum in Java SE 5, Module in Java SE 9, and Record in Java SE 14. The Java language provides concise syntax for declaring record classes, whereby the record components are declared in the record header. In this guide, we will explore how to effectively deserialize records while ensuring that optional fields are assigned default values if they are not provided in the JSON input. An Employee Use Jul 9, 2024 · Learn how to specify default field values in Apache Avro schemas. Defines the default value of request meta-data that is bound using one of the following annotations: PathParam, QueryParam, MatrixParam, CookieParam, FormParam, or HeaderParam. The list of record components declared in the record header form the record descriptor. databind. This is achievable because the record components, the canonical constructor, and the serialized form are all known and consistent. Apr 30, 2025 · Records in Java (3 part series) What are Java Records? How to use Java Records Java Records as Data Transfer Objects (upcoming) Table of Contents Creating and using java records Documentation Default Values Validation Normalization Modifying java records Manually add wither methods Use a compiler plugin Enforcing non-null Derived data Creating and using java records Using a java record is Nov 15, 2024 · In this blog post, we have explored effective approaches to handle null values when using Java 14's Records. Jan 8, 2024 · In Java, when working with a List, sometimes, we may want to set a default value for elements in the list. This constructor initializes the record's fields with the values passed to it. They are even Jan 8, 2024 · I am using Java 21, and trying to convert a String from a REST response to a record. The @Builder. But matching types is only one possible use case for pattern matching. Learn how to use Jackson in Java to automatically assign default values to null fields during JSON mapping with techniques and best practices. Returns a string representation of the record. We should also be familiar with the Record functionality introduced as a preview in Java 14 The introduction of classes in the java. We will then use the generated builder classes to construct objects in a clean, readable, and type Nov 18, 2022 · Table of Contents Creating and using records Documentation Default Tagged with java, record, programming. com. Feb 3, 2020 · Records are new type in Java 14, which allow you to declare simple data classes without all the boilerplate. Feb 16, 2024 · Exploring the New Horizons of Java 21: Record Patterns and Pattern Matching Introduction Java is constantly evolving, and with each update, it brings new and exciting features. Nov 7, 2024 · In this blog post, we delve into the topic of Spring @Value Annotation: Default Value Best Practices. getProperty ()`. With records, you don’t need to write any code to make the class immutable — it’s done for you automatically. The default value is used if the corresponding meta-data is not present in the request. Mar 10, 2023 · Learn how to create custom constructors for Java Records and the benefits they provide. Aug 24, 2024 · While they share some features with classes, such as the ability to implement interfaces and define constructors, records are final and cannot be extended. apache. You can create a generic record class. 13, "Serialization of Records". You may also go through Java 17 Features With Examples. Apr 28, 2023 · When to use Record in Java? If you want to transfer immutable data between different layers of your application, then using a record in Java can be a good choice. Default private boolean isEmailConfirmed = true; } Here is console output ui: false ui2 A record class is a shallowly immutable, transparent carrier for a fixed set of values, called the record components. By using methods like orElse(), orElseGet(), and orElseThrow(), you can ensure that your code is robust, avoids NullPointerException, and handles absent values gracefully. Dec 4, 2019 · How to set default value on field values in a class used in spring boot request parameter Asked 5 years, 8 months ago Modified 4 years, 4 months ago Viewed 13k times Jan 16, 2024 · A record, being a restricted form of a Class in Java, comes with its default implementation of equals (), hashCode (), and toString (). We can also compare two instances of a record for equality, as we would, for a class. A record pattern includes a record class type and a pattern list matched against the record component values. This feature can simplify method calls Apr 28, 2025 · Learn how to set default value in JPA entity using annotations, database defaults, and lifecycle callbacks in Spring Boot applications. This means that by default, the poll() method will retrieve up to 500 records at a time. The example will showcase how to define immutable data structures, apply validation rules, set default values for optional fields, and work with nested records. Often, it’s overridden to provide a meaningful description of the object’s state. These… Jul 17, 2020 · A record comprises attributes that primarily define its state. Explore JEP 440 & JEP 441 with real-world examples, including nested records Jan 23, 2023 · I study reflection and try to change field's value in Record. But does Java actually support this feature? Let's dive in and find out! 😄 💡 The Java Default Parameter Values Dilemma Here's a piece of code for context: public Introduction With the release of Java 17, developers gained access to Java Records, a feature designed to simplify the creation of immutable data models. Constructor for record classes to call. util. com Jun 10, 2025 · This blog post aims to explore different ways to achieve default values in Java records, covering fundamental concepts, usage methods, common practices, and best practices. You can use a record pattern to test whether a value is an instance of a record class type and, if it is, to recursively perform pattern matching on its component values. Aug 5, 2023 · I have this simple record in Java (a contrived example): public record DatePair( LocalDate start , LocalDate end , long days ) {} I want all three properties (start, end, &amp; days) to be available Apr 24, 2021 · Current status and usage before Java 16 and Jackson 2. How does the future of Java look in their context? May 10, 2020 · Assuming the following example: public record SomeRecord(int foo, byte bar, long baz) { } Do I need to override hashCode and equals if I were to add said object to a HashMap? Aug 23, 2025 · Explore three ways of dealing with missing or null values in JSON when parsing it with Jackson. It seems that builder does not get a default value. Sep 4, 2024 · Using record patterns with switch Record patterns combine the power of Java records (classes that act as immutable data carriers) and pattern matching. @Value("${some. You can tell Spring to inject this value or use default. public class Jan 23, 2019 · This is actually a bit tricky, but its java's nature, even there is no setter, the client code can still change the object's field value by using reflection which I assume thats how jackson does it. Now in your example, the state of the attribute value is null, hence the access using the default implementation ends up providing the true state. Superficially, Scoped values have many similarities with thread-local variables, like being bound to their thread. Here is a very simple example: @ Mar 18, 2021 · Java 16 introduced Records, which help to reduce boilerplate code when writing classes that carry immutable data. records is 500. Apr 17, 2019 · Spring @Value annotation is used for expression-driven dependency injection. shaded. Apr 7, 2025 · We can use the toString () method in Java to return a string representation of an object. This is secure because it means the record class can validate the values before assigning them to fields, just like when an ordinary Java program creates a record object via new. Sep 8, 2022 · You cannot use the the compact constructor to assign a default value for a record, since the record's fields are final and the compact constructor is code executed after the fields are initialized. As noted, no Java does not have default parameters (which usually has to be accompanied by named parameters to be useful). Records were first introduced in Java 14 as a preview feature and released as production-ready in Java 16 in March 2021. Also, it provides an Optional<T> class with the same name as Java but resides in a different package: @ParameterizedTest @ArgumentsSource(ObjectsProvider. Dec 8, 2023 · Unlock Java 21’s potential with Record Patterns and a powerful SWITCH statement, simplifying data modeling and boosting programming efficiency. Even though both of them can be used to reduce the boilerplate code, they are different tools. We can use patterns Dec 23, 2024 · Learn about the key Java 21 features, and see how they work in practice. Using an assignment in a constructor. For other methods, renaming some cases or using a parameter object can help. Default annotation is not straightforward with records. 63 votes, 107 comments. The Java object: class JavaObject { Nov 4, 2023 · Records in java are the special types of classes that act as transparent data carriers with less ceremony than the normal classes. JsonMappingException: C Jan 8, 2024 · In the case of Java records, we establish a static nested Builder class inside the record. Jun 15, 2022 · I'm wondering is there any way to combine java record with lombok's @Builder. “Impossible” objects are impossible. A record can implement interfaces. public record Record(int recordId) { public Record { } } But it created constructor with int param. Aug 6, 2024 · Learn to implement the builder pattern style fluent API and copy constructors in Java records for creating immutable records with examples. This allows developers to create immutable objects with predefined properties, making initialization more straightforward and flexible. consumer. Therefore, we should use the one that better suits our needs A record class is a shallowly immutable, transparent carrier for a fixed set of values, called the record components. It is inclined to improve developer productivity and program efficiency. Feb 5, 2025 · With records, you can achieve the same practical effects from the last snippet in a single line: By default, Java Records provide: In Java, records provide an implicit constructor, but Sep 5, 2023 · Java 21 extended the concept to be usable in switch statements and expressions: As you can see, the resulting code looks nicer and is more streamlined than before. Resources for learning Java Jan 21, 2022 · If you inject default values during deserialization, do those default values need to be represented in the serialized form? In this case, a more compact serialized form could still fully capture the state of the record object. Dec 11, 2020 · I am using Java 15 preview feature record in my code, and defined the record as follow public record ProductViewModel ( String id, String name, Jun 12, 2023 · It would be very useful in some situations to define default values when deserializing into a record. Jan 30, 2024 · Default Behavior The default value of max. Of course as a workaround, I can: public Set Jun 22, 2022 · You can have nested records too, which will implicitly be static. Records eliminate boilerplate code often associated with creating standard Java classes, such as getters, setters, toString(), equals(), and hashCode() methods. But there are several limitations. poll. Mar 3, 2023 · Immutable objects Records are immutable by default, making them a good choice for classes that should not be modified after instantiation. Unnamed patterns are an improvement over Record Patterns In Java 19 and Pattern Matching for Switch. It is only possible in the moment to define default values using the @JsonSetter annotation and Jun 12, 2025 · You can extend records with additional constructors, such as a default constructor (one without parameters) or one that sets x and y to the same value: public record Point(int x, int y) { Dec 28, 2023 · In the record example for the Film class, default values are set directly in the constructor body. testcontainers. However, certain fields might be null, and printing them could lead to NullPointerExceptions. Default parameter values are a feature that allows a function or method to have parameters with pre - defined values. It's important to note that unlike traditional classes, you cannot declare a no-argument constructor in records. A record class is a shallowly immutable, transparent carrier for a fixed set of values, called the record components. I add @Builder. Before java 14 @Value @Builder public c Record classes, which are a special kind of class, help to model plain data aggregates with less ceremony than normal classes. For constructors, See Effective Java: Programming Language Guide's Item 1 tip (Consider static factory methods instead of constructors) if the overloading is getting complicated. By default, Records are immutable in Java, which means that we can’t change their properties after they are created. Step-by-step guide with code examples. Jul 21, 2024 · Setting default values with Lombok's Builder. getAktiv(); Why I need this you may ask? I use the Record in a UI and want that the checkboxes are already set to the default value based on the Record that is bound to the model. Say I have a class Example and an instance variable answer whose default should be 42. kafka. Pattern matching provides us more flexibility when defining conditions for switch selector expressions and cases. I can either: // Example of #1 (initializer) class Example { Nov 17, 2023 · Usage and Benefits of Java Record Records in Java are useful in situations where you need classes that are simple data carriers, and you don't want to write a lot of boilerplate code just to define a class. clients. lang. Can be an array of values for collection or array-based properties. By implementing constructor checks, utilizing Optional fields, establishing default values, and considering validation libraries, you can manage null situations gracefully. Jan 16, 2024 · The release of Java 21 SE introduces an exciting preview feature: unnamed patterns and variables (JEP 443). Language Features Record patterns and type patterns can be nested to enable a powerful, declarative, and composable form of data navigation and processing. The derivation of the accessors, constructors, etc. @Value can configure default value to be used when actual value is not available for dependency injection. Java records seem to be a perfect match for your persistence layer. public record Temperature(double value, String unit) {} Simple value types Jan 16, 2024 · Learn how record patterns allow us to extract the values of a record into variables using pattern matching. Aug 28, 2024 · Conclusion Using Optional in Java 8 to provide default values is a powerful way to handle potentially null values in a more controlled and expressive manner. ConsumerConfig; Jan 16, 2024 · Java’s record keyword is a new semantic feature introduced in Java 14. Explore use cases, customization, and performance tips in Java 16+. Records have been a part of Java 14 and 15 but were still in preview. Returns a hash code value for the record. Feb 10, 2015 · We can use @Value("${property. Jul 14, 2015 · I am trying to simplify the following code. Learn how to use Java records with JPA and Hibernate. If a record constructor initializes some, but not all, fields, the generated methods consider those fields’ default values in their implementations. Java 21 comes with various new features, some preview features, enhancements, deprecation & deletions. name:defaultValue}") to provide a default value for the `@Value` annotation. In this tutorial, we explored how to work with default values in Java Avro, covering schema definition, code generation, and usage. Indicates whether some other object is "equal to" this one. You should use the latter and you are probably loading your properties in the wrong way. Improve your coding efficiency with this comprehensive tutorial. Answer In Java, records are a special kind of class designed to be a simple data carrier. If you wanted a builder and wanted a field to have a default value, you wo Apr 29, 2024 · Learn about record type in java. For example, this can be useful when initializing a list. It is introduced as preview feature in Java 14 and shall be used as plain immutable data classes for data transfer. akyqkj ssm oviiu qjoe cgwhx szgqx ceij okjf cgtzzc ghpijjw