(The Courseclass) Rewrite the Course class in Listing 1. Use an ArrayList to replace an ar...

(The Courseclass) Rewrite the Course class in Listing 1. Use an ArrayList to replace an array to store students. Draw the new UML diagram for the class. You should not change the original contract of the Course class (i.e., the definition of the constructors and methods should not be changed, but the private members may be changed.)

LISTING 10.6 Course.java

1 public class Calculator {
2 /** Main method */
3 public static void main(String[] args) {
4 // Check number of strings passed
5 if (args.length != 3) {
6 System.out.println(
7 "Usage: java Calculator operand1 operator operand2");
8 System.exit(0);
9 }
10
11 // The result of the operation
12 int result = 0;
13
14 // Determine the operator
15 switch (args[1].charAt(0)) {
16 case '+': result = Integer.parseInt(args[0]) +
17 Integer.parseInt(args[2]);
18 break;
19 case '-': result = Integer.parseInt(args[0]) -
20 Integer.parseInt(args[2]);
21 break;
22 case '.': result = Integer.parseInt(args[0]) *
23 Integer.parseInt(args[2]);
24 break;
25 case '/': result = Integer.parseInt(args[0]) /
26 Integer.parseInt(args[2]);
27 }
28
29 // Display result
30 System.out.println(args[0] + ' ' + args[1] + ' ' + args[2]
31 + " = " + result);
32 }
33 }