e01 - Midterm Exam Handout -

INSTRUCTIONS FOR QUESTION 1

The Aircraft class is intended to represent one of the rows in the table shown here, which is a portion of the United Airlines fleet:

Boeing 747-400 (744)	wifi	52 Business First	240 Economy	70 Economy Plus	12 Global First
Boeing 767-300 (763)	wifi	26 BusinessFirst	80 Economy	71 Economy Plus	6 Global First
Boeing 787-8 (788)	wifi	36 BusinessFirst	113 Economy	70 Economy Plus
Boeing 787-9 (789)	wifi	48 BusinessFirst	116 Economy	88 Economy Plus
Embraer EMB 170	wifi	48 Economy	16 Economy Plus	6 First
Embraer EMB 175	no wifi	48 Economy	16 Economy Plus	12 First
Bombardier CRJ-200	no wifi	46 Economy	4 Economy Plus
Bombardier CRJ-700	no wifi	28 Economy	32 Economy Plus	6 First

As you can see, for each Aircraft in a fleet, we need to be able to store:

a name, such as "Boeing 747-400 (744)"
or "Embraer EMB 175"
an indication of whether the plane has wifi or not
a collection of Cabins

For your convenience, you may assume that there is a Cabin class available to you with:

a constructor: public Cabin(String name, int seats)
public getter methods:
String getName() and int getSeats()
a public String toString() method that returns a cabin in the format shown in the table, e.g. "28 Economy"

Your job is to write the public class Aircraft, with all of the following:

(10 pts) Correct syntax and structure of a Java class.
(8 pts) Private instance variables for the data members (attributes)
(8 pts) A two-argument constructor that takes arguments for the name of the aircraft, and whether or not the aircraft has wifi: Example invocation:
```
    Aircraft a = new Aircraft("Boeing 747-400 (744)",true);
    Aircraft b = new Aircraft("Embraer EMB 175",false);
```
(8 pts) getter methods called getName and hasWifi that return appropriate values

(8 pts) a method addCabin that adds a Cabin object to the aircraft. For example,

    Aircraft a = new Aircraft("Boeing 747-400 (744)",true);
    Cabin bf = new Cabin("Business First",52);
    a.addCabin(bf);
    Cabin e = new Cabin("Economy",240);
    a.addCabin(e);

(8 pts) a correct toString() method. The method should return a representation of the aircraft object in a format that follows these examples.
```
Boeing 747-400 (744) (Capacity: 374 )
Bombardier CRJ-200 V1 (Capacity: 50)
```
The capacity should be the sum of the capacities of all cabins that have been added to the Aircraft.

Note that for this exam, you do NOT need to include Javadoc comments or write a .equals method.

Total Points: Total points: ?

Code for Question 6


public class Dog {

    private static Dog dogOfTheWeek = null;
    
    private String name;
    
    public void setAsDogOfTheWeek() {
	dogOfTheWeek = this;
    }

    public static Dog getDogOfTheWeek() {
	return dogOfTheWeek;
    }
    
    public Dog(String name) { this.name = name;}

    public static void main(String [] args) {

	Dog d1 = new Dog("Snoopy"); 
	Dog d2 = new Dog("Princess"); 
	Dog d3 = new Dog("Rover");
	Dog d4 = new Dog("Spot"); 
	Dog d5 = new Dog("Fido"); 


	d5.setAsDogOfTheWeek();    /*  1 */
	d2 = d1;                   /*  2 */
	Dog d3 = d6;               /*  3 */ 
	Dog temp = d2;             /*  4 */
	d2 = d5;                   /*  5 */
	d5 = temp;                 /*  6 */
	d3 = getDogOfTheWeek();    /*  7 */
	d1.setAsDogOfTheWeek();    /*  8 */
	d1 = null;                 /*  9 */
	d2 = null;                 /* 10 */
	d3 = null;                 /* 11 */
	d4 = null;                 /* 12 */
	d5 = null;                 /* 13 */
	temp = null;               /* 14 */
    }                              /* 15 */
}

End of Handout