Скачать или смотреть java record class example

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java introduced the `record` class in java 14 as a preview feature and made it a standard feature in java 16. records are a special kind of class in java that are a quick way to create data-carrying classes (also known as dtos - data transfer objects). they provide a compact syntax for declaring classes whose main purpose is to hold data.

key features of java records:

1. **immutability**: fields in a record are final, meaning once an instance is created, its data cannot be changed.
2. **automatic implementations**: records automatically provide implementations of `equals()`, `hashcode()`, and `tostring()` methods based on their fields.
3. **concise syntax**: records reduce boilerplate code, making it easier to create data classes.

syntax of a record

here's how you declare a record:



example of a java record

let’s create a simple example of a `person` record that holds a name and an age.



using the person record

now let's see how to use the `person` record in a java application:



explanation of the example:

1. **record declaration**: we declare a record named `person` with two fields: `name` of type `string` and `age` of type `int`.

2. **constructor**: the record automatically generates a constructor, so we can create instances by passing the required fields.

3. **field accessors**: the fields can be accessed using methods that have the same name as the fields. for example, `person1.name()` retrieves the name.

4. **custom methods**: you can define methods in a record. in our example, we defined a `greeting()` method that uses the fields.

5. **equality and hashing**: the `equals()` and `hashcode()` methods are overridden to compare records based on their values rather than their references.

6. **string representation**: the `tostring()` method is overridden to provide a string representation of the record in a readable format.

conclusion

java records are a powerful feature that allows developers to create simple data-carryin ...

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