Java record getter lombok example

Java record getter lombok example

Here is an example of using Lombok to generate getters for a Java record:

Let's say we have the following User record:

@record
public class User {
private final String name;
private final int age;
public User(String name, int age) {
this.name = name;
this.age = age;
}
}

By default, Lombok will not generate any getters for the record's fields. However, if we add the @Getter annotation to the User class, Lombok will generate getters for all the fields:

@Getter
@record
public class User {
private final String name;
private final int age;
public User(String name, int age) {
this.name = name;
this.age = age;
}
}

Now, if we create an instance of User and access the fields using getters, Lombok will generate the necessary code to retrieve the values:

User user = new User("John", 30);
String userName = user.getName(); // generated getter
int userAge = user.getAge(); // generated getter
System.out.println(userName); // prints "John"
System.out.println(userAge); // prints 30

In this example, Lombok generates the following getters:

public String getName() {
return name;
}
public int getAge() {
return age;
}

As you can see, using Lombok's @Getter annotation simplifies the process of creating getters for a record's fields. This can be especially useful when working with immutable data classes or records.

It's worth noting that Lombok also supports other annotations, such as @Setter, @Builder, and @ToString, which can help simplify your Java code even further. For example, you could use the @Builder annotation to create a fluent builder for your record:

@Getter
@Setter
@Builder(toBuilder = true)
@record
public class User {
private final String name;
private final int age;
public User(String name, int age) {
this.name = name;
this.age = age;
}
}

This would allow you to create a builder for your User record and use it like this:

User user = User.builder().name("John").age(30).build();

Overall, Lombok can be a powerful tool in simplifying your Java code and making it more concise and readable.

Java record Lombok Builder

I'll respond in English as per your request.

Java records are a new feature introduced in Java 14 (Nathan) and allow you to create simple classes that hold data without requiring the boilerplate code typically associated with getters and setters. They were designed to be used with Lombok, which can automatically generate these methods for you.

Lombok is an open-source project that aims to reduce the amount of boilerplate code in your Java projects by providing a simpler way of writing classes. It achieves this through the use of annotations, such as @Data and @Builder, which are used to define how the class should be constructed and accessed.

A record is essentially a special type of class that can hold data without requiring you to write getters and setters manually. When you create a record using Lombok, it will automatically generate these methods for you.

Here's an example of how you could use Java records with Lombok Builder:

@Value
public static class PersonRecord {
private final String firstName;
private final String lastName;
public static PersonRecordBuilder builder() {
return new PersonRecordBuilder();
}
public static class PersonRecordBuilder {
private String firstName;
private String lastName;
public PersonRecordBuilder firstName(String firstName) {
this.firstName = firstName;
return this;
}
public PersonRecordBuilder lastName(String lastName) {
this.lastName = lastName;
return this;
}
public PersonRecord build() {
return new PersonRecord(firstName, lastName);
}
}
}

To use the PersonRecord class with the Lombok Builder, you would do something like this:

PersonRecord person = PersonRecord.builder()
.firstName("John")
.lastName("Doe")
.build();

In this example, we're using the @Value annotation to create a record that holds two pieces of data: firstName and lastName. We're also creating a builder class that allows us to construct an instance of the record with the desired values.

The benefits of using Java records with Lombok Builder include:

Overall, Java records and Lombok Builders provide a powerful tool for creating simple classes that hold data without requiring excessive boilerplate code.