Скачать или смотреть java record as dto

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java records, introduced in java 14 as a preview feature and made a standard feature in java 16, provide a compact syntax for declaring classes that are primarily used to hold data. they are a great fit for data transfer objects (dtos) because they are immutable and provide a concise way to create data-holding classes without boilerplate code.

what is a dto?

a data transfer object (dto) is a design pattern used to transfer data between software application subsystems or layers. dtos are often used in scenarios where you want to encapsulate data and send it over the network or between processes.

benefits of using records as dtos

1. **immutability**: records are inherently immutable, which means that once created, their state cannot be altered. this characteristic makes them thread-safe and easier to reason about.
2. **conciseness**: they reduce boilerplate code by automatically generating methods like `equals()`, `hashcode()`, and `tostring()`.
3. **pattern matching**: records work well with pattern matching, which provides a more expressive syntax for working with data.

declaring a record

records are declared using the `record` keyword, followed by the name of the record and its components. here’s a simple example:



example of using a record as a dto

let's create a simple example where we use a `userdto` to transfer user data between a service and a controller in a hypothetical application.

#### step 1: define the dto



#### step 2: create a service class

this class will simulate retrieving user data from a database and returning a `userdto`.



#### step 3: create a controller class

this class will handle http requests and use the `userservice` to get user data.



#### step 4: putting it all together

here's how you can run the application:



output

when you run the `main` class, you should get the following output:



summary

using java records as dtos allows you to efficiently transfer data between layers of an application ...

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