Exercise 6        Name __________________        Score __/17

Modified: 

1. (2) Define an array named vowels of type char initialized to contain the vowels a, e, i, o, u.
    

   char vowels[] = new char[5];        vowels[0] = 'a'; vowels[1] = 'e'; vowels[2] = 'i'; vowels[3] = 'o'; vowels[4] = 'u';

   char vowels[] = { 'a', 'e', 'i', 'o', 'u' };

2. (2) Define an array named color of String initialized to contain the Strings "red", "white", "yellow" and "blue".
    

   String color[]=new String[4]; color[0] = "red"; color[1] = "white"; color[2] = "yellow"; color[3] = "blue";

   String color[] = {  "red", "white", "yellow", "blue" };

   

    

3. (2) Diagram the following fixed size array declaration similar to at right for NumberDisplay:

   Use the TicketMachine definition on page 35.

   TicketMachine t1 = new TicketMachine(40);
   TicketMachine t2 = new TicketMachine(50);
   TicketMachine t3 = new TicketMachine(60);
   TicketMachine t4 = new TicketMachine(50);

   TicketMachine C [ ] = new TicketMachine[4];
   C[0]=t1;
   C[1]=t2;
   C[2]=t3;
   C[3]=t4; 
    

    

4. (1) Does the following initialize array C equivalently to the Java code in Question 3?   __yes except for t1-t4____
   
   TicketMachine C[] = { new TicketMachine(40),
                                     new TicketMachine(50),
                                     new TicketMachine(60),
                                     new TicketMachine(50)
                                   };       
    
5. (2) Give the Java for-statement to print the price of each TicketMachine variable of array C in Question 3 (use TicketMachine getPrice() method).
   
    

   for(int i=0; i<4; i++)     System.out.println( C[i].getPrice() );

    

6. (2) Give the Java for-statement to total the price of each TicketMachine variable of array C in Question 3 (use TicketMachine getPrice() method).
   
    

   int total=0; for(int i=0; i<4; i++)     total = total + C[i].getPrice();

    

7. (2) Write the Java method greatestPrice() that returns the greatest price of a TicketMachine variable of array C in Question 4 (use TicketMachine getPrice() method). The solution should work for any array of TicketMachines.
   
    

   public int greatest() {     int gP = C[0].getPrice();     for(int i=1; i<4; i++)         if ( C[i].getPrice() > gP)                 gP = C[i].getPrice();     return gP; }

   
    

8. (2) Give the Java for-statement to print the price of each TicketMachine variable of ArrayList D below (use TicketMachine getPrice() method).

   Use the TicketMachine definition below.

   TicketMachine t1 = new TicketMachine(40);
   TicketMachine t2 = new TicketMachine(50);
   TicketMachine t3 = new TicketMachine(60);

   ArrayList <TicketMachine> D = new ArrayList <TicketMachine>();
   D.add(t1);
   D.add(t2);
   D.add(t3); 
   D.add(new TicketMachine(50)); 

   for(int i=0; i < D.size(); i++)     System.out.println( D.get(i).getPrice() );

9. (2) Write the Java method greatestPrice() that returns the greatest price of any TicketMachine variable from ArrayList D in Question 8 (use TicketMachine getPrice() method). The solution should work for any size ArrayList collection of TicketMachines.
    

   public int greatestPrice() {     int gP = D.get(0).getPrice();     for(int i=1; i<D.size(); i++)         if( D.get(i).getPrice() > gP)             gP = D.get(i).getPrice();     return gP; }