Customer

public class Customer {

    private final int age;
    private final double rating;

    public Customer(int age, double rating) {
        this.age = age;
        this.rating = rating;
    }

    public int getAge() {
        return age;
    }

    public double getRating() {
        return rating;
    }

    /**
     * Aligned columns; floating numbers printed with two decimals.
     */
    @Override
    public String toString() {
        return String.format("%-10d %-10.2f", age, rating);
    }
}