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the comparedTo method. This is the course class I do not understand how to do the compared to method. I need to order the course first by department then by the course number.
This is the course class
public class Course implements Comparable{ private String prefix; private int number; private String title; private String grade; /** * Constructs the course with the specified information. * * @param prefix the prefix of the course designation * @param number the number of the course designation * @param title the title of the course * @param grade the grade received for the course */ public Course(String prefix, int number, String title, String grade) { this.prefix = prefix; this.number = number; this.title = title; if (grade == null) this.grade = ""; else this.grade = grade; } /** * Constructs the course with the specified information, with no grade * established. * * @param prefix the prefix of the course designation * @param number the number of the course designation * @param title the title of the course */ public Course(String prefix, int number, String title) { this(prefix, number, title, ""); }
/** * Returns the prefix of the course designation. * * @return the prefix of the course designation */ public String getPrefix() { return prefix; } /** * Returns the number of the course designation. * * @return the number of the course designation */ public int getNumber() { return number; } /** * Returns the title of this course. * * @return the prefix of the course */ public String getTitle() { return title; } /** * Returns the grade for this course. * * @return the grade for this course */ public String getGrade() { return grade; } /** * Sets the grade for this course to the one specified. * * @param grade the new grade for the course */ public void setGrade(String grade) { this.grade = grade; } /** * Returns true if this course has been taken (if a grade has been received). * * @return true if this course has been taken and false otherwise */ public boolean taken() { return !grade.equals(""); } /** * Determines if this course is equal to the one specified, based on the * course designation (prefix and number). * * @return true if this course is equal to the parameter */ public boolean equals(Object other) { boolean result = false; if (other instanceof Course) { Course otherCourse = (Course) other; if (prefix.equals(otherCourse.getPrefix()) && number == otherCourse.getNumber()) result = true; } return result; } /** * Creates and returns a string representation of this course. * * @return a string representation of the course */ public String toString() { String result = prefix + " " + number + ": " + title; if (!grade.equals("")) result += " [" + grade + "]"; return result; }}
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