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// Professor.java - Chapter 16 version. 
 
// Copyright 2000 by Jacquie Barker - all rights reserved. 
 
// A MODEL class. 
 
 
import java.util.*; 
 
public class Professor extends Person { 
	//------------ 
	// Attributes. 
	//------------ 
 
	private String title; 
	private String department; 
	private Vector teaches; // of Sections 
 
	//---------------- 
	// Constructor(s). 
	//---------------- 
 
	public Professor(String name, String ssn, String title, String dept) { 
		// Reuse the parent constructor with two arguments. 
 
		super(name, ssn); 
 
		setTitle(title); 
		setDepartment(dept); 
 
		// Note that we must instantiate an empty vector. 
 
		teaches = new Vector(); 
	} 
		 
	//----------------- 
	// Get/set methods. 
	//----------------- 
 
	public void setTitle(String title) { 
		this.title = title; 
	} 
	 
	public String getTitle() { 
		return title; 
	} 
 
	public void setDepartment(String dept) { 
		department = dept; 
	} 
 
	public String getDepartment() { 
		return department; 
	} 
 
	//----------------------------- 
	// Miscellaneous other methods. 
	//----------------------------- 
 
	// Used for testing purposes. 
 
	public void display() { 
		// First, let's display the generic Person info. 
 
		super.display(); 
		 
		// Then, display Professor-specific info. 
 
		System.out.println("Professor-Specific Information:"); 
		System.out.println("\tTitle:  " + getTitle()); 
		System.out.println("\tTeaches for Dept.:  " + getDepartment()); 
		displayTeachingAssignments(); 
	} 
	 
	// We are forced to program this method because it is specified 
	// as an abstract method in our parent class (Person); failing to 
	// do so would render the Professor class abstract, as well. 
	// 
	// For a Professor, we wish to return a String as follows: 
	// 
	// 	Josephine Blow (Associate Professor, Math) 
 
	public String toString() { 
		return getName() + " (" + getTitle() + ", " + 
		       getDepartment() + ")"; 
	} 
 
	public void displayTeachingAssignments() { 
		System.out.println("Teaching Assignments for " + getName() + ":"); 
		 
		// We'll step through the teaches Vector, processing 
		// Section objects one at a time. 
 
		if (teaches.size() == 0)  
			System.out.println("\t(none)"); 
 
		else for (int i = 0; i < teaches.size(); i++) { 
			// Because we are going to need to delegate a lot of the effort 
			// of satisfying this request to the various Section objects that 
			// comprise the Professor's teaching load, we "pull" the Section  
			// object once, and refer to it by a temporarily handle. 
 
			Section s = (Section) teaches.elementAt(i); 
 
			// Note how we call upon the Section object to do 
			// a lot of the work for us! 
 
			System.out.println("\tCourse No.:  " + 
				s.getRepresentedCourse().getCourseNo()); 
			System.out.println("\tSection No.:  " +  
				s.getSectionNo()); 
			System.out.println("\tCourse Name:  " + 
				s.getRepresentedCourse().getCourseName()); 
			System.out.println("\tDay and Time:  " + 
				s.getDayOfWeek() + " - " +  
				s.getTimeOfDay()); 
			System.out.println("\t-----"); 
		} 
	} 
	 
	public void agreeToTeach(Section s) { 
		teaches.addElement(s); 
 
		// We need to link this bidirectionally. 
		s.setInstructor(this); 
	} 
}