package Kursovaa2; 
public class Main {
    public static void main(String[] args) {

        Battery battery = new Battery("LItieva", 20, 20);
        Screen screen = new Screen(4.7, 25000);
        Phone nokiaN95 = new Phone("95", "Nokia", 25.5, battery, screen);
        System.out.println(nokiaN95.toString());

    }
}
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package Kursovaa2; 
public class Battery {

    private String model;
    private double idleTime;
    private double hoursTalk;

    public Battery(String model, double idleTime, double hoursTalk) {
        this.model = model;
        this.idleTime = idleTime;
        this.hoursTalk = hoursTalk;
    }
   @Override
    public String toString() {
        return String.format("Model: %s\n"
                + "Idle time: %.2f\n"
                + "Hours talk %.2f\n", this.model, this.idleTime, this.hoursTalk);
    }
}
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package Kursovaa2; 
public class Phone {

    private String model;
    private String brand;
    private double price;
    private String owner;
    private Battery battery;
    private Screen screen;

    public Phone(String model, String brand, double price, Battery battery, Screen screen) {
        this.model = model;
        this.brand = brand;
        this.price = price;
        this.owner = null;
        this.battery = battery;
        this.screen = screen;
    }
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public Phone(String model, String brand, double price, String owner, Battery battery, Screen screen) {
        this.model = model;
        this.brand = brand;
        this.price = price;
        this.owner = owner;
        this.battery = battery;
        this.screen = screen;
    }

    @Override
    public String toString() {
        String result = String.format("%s %s\n"
                + "Price: %.2f\n", this.brand, this.model, this.price);
        if (this.owner != null) {
            result += String.format("Owner: %s", this.owner);
        }
        result += battery.toString();
        result += screen.toString();
        return result;
    }
}
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package Kursovaa2;
public class Screen {

    private double size;
    private int colors;

    public Screen(double size, int colors) {
        this.size = size;
        this.colors = colors;
    }

    @Override
    public String toString() {
        return String.format("Size: %.2f\n"
                + "Colors: %d", this.size, this.colors);
    }
}