
LANGUAGE: JAVA
CHALLENGE:
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
SOLUTION:
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(); }
This is the code that worked:
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();
}