Question

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 #(phoneNumber), and two abstract methods: a boolean-valued method named createConnection that returns a boolean and accepts an reference to an object of type Network, and a void-returning method, closeConnection, that accepts no parameters

Answer 1

Answer:

Java class is given below

Explanation:

public abstract class Phone

{private

String phoneNumber;

public Phone(String phoneNumber)

{

this.phoneNumber = phoneNumber;

}

public String getPhoneNumber()

{

return this.phoneNumber;

}

public String toString()

{

return "#("+this.phoneNumber+")";

}

public abstract boolean createConnection(Network n);

public abstract void closeConnection();

}