Constructors

import java.util.Scanner;

public class Program {

    public static void main(String[] args) throws Exception {

        Scanner sc = new Scanner (System.in);
        SmartphoneBattery Battery = new SmartphoneBattery();
        System.out.print("What is the type of battery: ");
        Battery.type = sc.nextLine();
        System.out.print("What is the capacity of the battery (mAh): ");
        Battery.capacity = Double.parseDouble(sc.nextLine());
        System.out.print("Adding quantity: ");
        Battery.quantity = Double.parseDouble(sc.nextLine());

        System.out.println();

        Battery.printInfo();
    }
}





public class SmartphoneBattery {
    String type;
    double capacity;
    double quantity;


     void printInfo() { System.out.println("Battery type: " + this.type);
     System.out.printf("Battery capacity: %.0f\n" ,this.capacity);
     System.out.printf("Adding quantity: %.0f", this.quantity); }


    void charge(double mAh) throws Exception {
        if ((mAh + this.quantity) > this.capacity) {
            throw new Exception();
        } else {
            this.quantity += mAh;
        }
    }

    public SmartphoneBattery() {
        this.type = "li-ion";
        this.capacity = 3500;
        this.quantity = 3000;
    }

    public SmartphoneBattery(String type, double capacity, double quantity) {
        this.type = type;
        this.capacity = capacity;
        this.quantity = quantity;
    }
}