Initialization of classes without any constructor in Java

Phone nokiaPhone = new Phone();
nokiaPhone.model = "Nokia 6610";

Phone iPhone5 = new Phone();
iPhone5.model = "iPhone 5";

Employee kim = new Employee();
kim.firstName = "Victorya";
kim.lastName = "Kim";
kim.personalPhone = iPhone5;

class Phone {
    public String model;
}

class Employee {
    public String firstName;
    public String lastName;
    public Phone personalPhone;
}