Kod źródłowy do wpisu o Records Classes w Javie 14 znajdującego się pod adresem: https://blog.mloza.pl/java-14-record-classes/

LocalRecord.java

    public static void localRecord() {
        String persons = """
                Java,Developer,29
                Python,Developer,25
                John,Doe,65
                """;

        record LocalPerson(String firstName, String lastName, int age) {
            LocalPerson(String[] data) {
                this(data[0], data[1], Integer.parseInt(data[2]));
            }
        }

        Arrays.stream(persons.split("\n"))
                .map(i -> i.split(","))
                .map(LocalPerson::new)
                .forEach(System.out::println);
    }

Main.java

public class Main {
    public static void main(String[] args) {
        Person p = new Person("Java", "Developer", 29);
        System.out.println(p.firstName());
        System.out.println(p.lastName());
        System.out.println(p.age());
        System.out.println(p);
    }
}

Person.java

public record Person(
        String firstName,
        String lastName,
        int age) {}

PersonConstructor.java

public record Person (
        String firstName,
        String lastName,
        int age) {

    public Person {
        if (age < 20) {
            new IllegalArgumentException("You are too young!");
        }
    }

    public Person() {
        this("Java", "Developer", 21);

        System.out.println("Default object has been created");
    }
}

PersonMethods.java

public record Person (
        String firstName,
        String lastName,
        int age) {

    public static int x;

    public static int inc() {
        return x++;
    }
    
    public String getFullName() {
        return firstName + " " + lastName;
    }
}

PersonOldWay.java

public final class PersonOldWay {
    private final String firstName;
    private final String lastName;
    private final int age;

    public PersonOldWay(String firstName, String lastName, int age) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.age = age;
    }

    public String firstName() {
        return firstName;
    }

    public String lastName() {
        return lastName;
    }

    public int age() {
        return age;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        PersonOldWay personOld = (PersonOldWay) o;
        return age == personOld.age &&
                Objects.equals(firstName, personOld.firstName) &&
                Objects.equals(lastName, personOld.lastName);
    }

    @Override
    public int hashCode() {
        return Objects.hash(firstName, lastName, age);
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder("PersonOldWay{");
        sb.append("firstName='").append(firstName).append('\'');
        sb.append(", lastName='").append(lastName).append('\'');
        sb.append(", age=").append(age);
        sb.append('}');
        return sb.toString();
    }
}