All phones must have a way of making and then terminating a connection to the phone network; however the exact procedure for doing so depends upon the nature of the phone (e. g. landline, cell phone, satellite phone). Write a abstract class, Phone, that contains a string instance variable, phoneNumber, a constructor that accepts a string parameter initializing the instance variable, an accessor method, getPhoneNumber, that returns the phoneNumber, a toString method that return the phoneNumber in the form

The code will be a java-script code

Explanation:

public abstract class Phone{

    private String phoneNumber ;

    public Phone  (String thePhoneNumber) {

        phoneNumber = thePhoneNumber ;

    }

    public  String getPhoneNumber ( ) {

        return phoneNumber ;

    }

public String toString (  ) {

    phoneNumber = "# (" + phoneNumber + ") " ;

    return phoneNumber ;

   }

public abstract boolean createConnection (Network status) ;

public abstract void closeConnection(  ) ;

}

go to edit profile, preferences, then choose level and select the desired choice.