8.1 Declare Card subclasses Consider using the following Card class. public class Card { private String name; public Card() { name = ""; } public Card(String n) { name = n; } public String getName() { return name; } public boolean isExpired() { return false; } public String format() { return "Card holder: " + name; } } Use this class as a superclass to implement a hierarchy of related classes: Class Data IDCard ID number CallingCard Card number, PIN DriverLicense Expirationyear Write declarations for each of the subclasses. For each subclass, supply private instance variables. Leave the bodies of the constructors and the format methods blank for now. Important: DriverLicense is subclass of IDCard class Lab 8.2 Provide constructors for Card subclasses Implement constructors for each of the three subclasses. Each constructor should call the superclass constructor to set the name. Here is one example: public IDCard(String n, String id) { super(n); idNumber = id; }
OOPs
In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.
Constructor
The easiest way to think of a constructor in object-oriented programming (OOP) languages is:
Lab 8.1 Declare Card subclasses
Consider using the following Card class.
public class Card
{
private String name;
public Card()
{
name = "";
}
public Card(String n)
{
name = n;
}
public String getName()
{
return name;
}
public boolean isExpired()
{
return false;
}
public String format()
{
return "Card holder: " + name;
}
}
Use this class as a superclass to implement a hierarchy of related classes:
Class Data
IDCard ID number
CallingCard Card number, PIN
DriverLicense Expirationyear
Write declarations for each of the subclasses. For each subclass, supply private instance variables. Leave the bodies of the constructors and the format methods blank for now.
Important: DriverLicense is subclass of IDCard class
Lab 8.2 Provide constructors for Card subclasses
Implement constructors for each of the three subclasses. Each constructor should call the superclass constructor to set the name. Here is one example:
public IDCard(String n, String id)
{
super(n);
idNumber = id;
}
Lab 8.3 Declare format methods for subclasses
Replace the implementation of the format method for the three subclasses. The methods should produce a formatted description of the card details. The subclass methods should call the superclass format method to get the formatted name of the cardholder.
Lab 9 Unit Testing for three subclasses
Create each object for all three subclasses, print out each object information by invoking format method.
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