Kotlin vs Java: with 関数でオブジェクト操作をよりシンプルに

public class User {
    private String name;
    private int age;

    public void setName(String name) { this.name = name; }
    public void setAge(int age) { this.age = age; }
    public void printUser() {
        System.out.println("Name: " + name + ", Age: " + age);
    }
}

public class Main {
    public static void main(String[] args) {
        User user = new User();
        user.setName("Alice");
        user.setAge(25);
        user.printUser();
    }
}

Name: Alice, Age: 25

data class User(var name: String = "", var age: Int = 0) {
    fun printUser() {
        println("Name: $name, Age: $age")
    }
}

fun main() {
    val user = User()

    with(user) {
        name = "Alice"
        age = 25
        printUser()
    }
}

Name: Alice, Age: 25