I have to create a java class(es) (with appropriate methods) to manage a promoti
ID: 3581307 • Letter: I
Question
I have to create a java class(es) (with appropriate methods) to manage a promotion program for a small coffee shop. (I was thinking it could be a customer loyalty points program) All classes should have at least a null constructor and copy constructor. Other constructors would be up to your discretion. Include all necessary accessors and modifiers. To test your classes, create a Container class with simply a main() method. The Container class will have attributes that are class objects of each of the classes you create. The main() method will create the class objects, perform some normal business for that store, and produce appropriate output, like:
-Calculating points -Determining if a customer is part of the loyalty rewards program
-Updating an existing loyalty card
-Checking the amount of points on a card
-Applying a reward to a purchase
-Updating a card after purchase
I would really appreciate any help!! Please all comment throughout the code so I can try to understand. Thank you so much!!:)
Explanation / Answer
import com.evrythng.commons.LowerCaseKeyMap;
import com.fasterxml.jackson.annotation.JsonIgnore;
import java.io.Serializable;
import java.util.Map;
public class LoyaltyPoints extends LowerCaseKeyMap<LoyaltyPoints.SchemePoints> {
private static final long serialVersionUID = -3050341780268798332L;
public LoyaltyPoints() {
}
public LoyaltyPoints(String scheme, Integer pointsChange, Integer tierPointsChange) {
put(scheme, pointsChange, tierPointsChange);
}
/**
* Deep copy of all the items.
*/
public LoyaltyPoints(LoyaltyPoints items) {
for (Map.Entry<String, LoyaltyPoints.SchemePoints> pc : items.entrySet()) {
put(pc.getKey(), pc.getValue().points, pc.getValue().tierPoints);
}
}
public static class SchemePoints implements Serializable {
private static final long serialVersionUID = -2883368743402696369L;
private Integer points;
private Integer tierPoints;
public Integer getPoints() {
return points;
}
@JsonIgnore
public int getPointsOrZero() {
return points != null ? points : 0;
}
public void setPoints(Integer points) {
this.points = points;
}
public Integer getTierPoints() {
return tierPoints;
}
@JsonIgnore
public int getTierPointsOrZero() {
return tierPoints != null ? tierPoints : 0;
}
public void setTierPoints(Integer tierPoints) {
this.tierPoints = tierPoints;
}
public void add(SchemePoints other) {
if (other.getPointsOrZero() != 0) {
setPoints(getPointsOrZero() + other.getPointsOrZero());
}
if (other.getTierPointsOrZero() != 0) {
setTierPoints(getTierPointsOrZero() + other.getTierPointsOrZero());
}
}
}
public void put(String scheme, Integer points, Integer tierPoints) {
LoyaltyPoints.SchemePoints pc = new SchemePoints();
pc.points = points;
pc.tierPoints = tierPoints;
put(scheme, pc);
}
/**
* Merges the given loyalty points into <code>this</code>.
*/
public void merge(LoyaltyPoints other) {
for (Map.Entry<String, LoyaltyPoints.SchemePoints> pc : other.entrySet()) {
LoyaltyPoints.SchemePoints thisPoints = get(pc.getKey());
if (thisPoints == null) {
put(pc.getKey(), pc.getValue().getPoints(), pc.getValue().getTierPoints());
} else {
thisPoints.add(pc.getValue());
}
}
}
/**
* Creates a new map with all values multiplied by -1.
*/
public LoyaltyPoints invert() {
LoyaltyPoints inv = new LoyaltyPoints();
for (Map.Entry<String, LoyaltyPoints.SchemePoints> pc : this.entrySet()) {
inv.put(pc.getKey(), invert(pc.getValue().points), invert(pc.getValue().tierPoints));
}
return inv;
}
private static Integer invert(Integer v) {
if (v == null) {
return null;
}
return -v;
}
}