Question

Java problem

Implement class Course containing: String name, enumeration Type (Foundamental, Specialization, Discipline), enumeration Stream (English, French, German), int creditPoints.

 Class Contract has an array of courses with methods addCourse(Course), deleteCourse(type, stream, name) sort(), display().

 Courses are sorted by stream, type, name.

 If 2 courses are equal raise a custom exception in method sort().

 Make Contract implement Storable.

Answer 1

//Course.java

package test2;

public class Course {

   private String name;
   private enum Type {
       Foundamental, Specialization, Discipline;
   }
   private Type type;
  
   private enum Stream {
       English, French, German;
   }
   private Stream stream;
  
   private int creditPoints;

   public Course(){
       this.name = "Not set";
       this.type = Type.Discipline;
       this.stream = Stream.English;
       this.creditPoints = 0;
   }
  
   public Course(String name, String type, String stream, int creditPoints){
       this.name = name;
       this.type = Type.valueOf(type);
       this.stream = Stream.valueOf(stream);
       this.creditPoints = creditPoints;
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public String getType() {
       return type.name();
   }

   public void setType(String type) {
       this.type = Type.valueOf(type);
   }

   public String getStream() {
       return stream.name();
   }

   public void setStream(String stream) {
       this.stream = Stream.valueOf(stream);
   }

   public int getCreditPoints() {
       return creditPoints;
   }

   public void setCreditPoints(int creditPoints) {
       this.creditPoints = creditPoints;
   }
  
   public String toString(){
       return "Name: " + this.name + "\n"
               + "Type: " + this.type.name() + "\n"
               + "Stream: " + this.stream.name() + "\n"
               + "Credit Points: " + this.creditPoints + "\n";
   }
}

//test.java
package test2;
public class test {
   public static void main(String[] args) {
       Course c1 = new Course("b","Discipline","English",5);
       Course c2 = new Course("a","Discipline","German",5);
       Course c3 = new Course("d","Foundamental","French",5);
       Course c4 = new Course("c","Discipline","English",5);
       Course c6 = new Course("f","Specialization","French",5);
       Contract obj = new Contract();
       obj.add(c1);
       obj.add(c2);
       obj.add(c3);
       obj.add(c4);
       obj.add(c6);
       obj.display();
       obj.sortByName();
       System.out.println("\nAfter sorting by Name\n");
       obj.display();
       obj.sortByType();
       System.out.println("\nAfter sorting by Type\n");
       obj.display();
       obj.sortByStream();
       System.out.println("\nAfter sorting by Stream\n");
       obj.display();
       Course c5 = new Course("c","Discipline","English",5);
       obj.add(c5);
       System.out.println("\nDuplicate value exception\n");
       obj.sortByName();
   }

}