Java Reference
In-Depth Information
Display 9.3
Same Thing Using Exception Handling
(part 2 of 3)
11
try
12 {
13
if
(men == 0 && women == 0)
14
throw new
Exception("Lesson is canceled. No students.");
15
else if
(men == 0)
16
throw new
Exception("Lesson is canceled. No men.");
17
else if
(women == 0)
try
block
18
throw new
Exception("Lesson is canceled. No women.");
19 //
women
>=
0 && men
>=
0
20
if
(women >= men)
21 System.out.println("Each man must dance with " +
22 women/(
double
)men + " women.");
23
else
24 System.out.println("Each woman must dance with " +
25 men/(
double
)women + " men.");
26 }
27
catch
(Exception e)
28 {
29 String message = e.getMessage();
30 System.out.println(message);
31 System.exit(0);
32 }
catch
block
33 System.out.println("Begin the lesson.");
34 }
35 }
Sample Dialogue 1
Enter number of male dancers:
4
Enter number of female dancers:
6
Each man must dance with 1.5 women.
Begin the lesson.
Sample Dialogue 2
Enter number of male dancers:
0
Enter number of female dancers:
0
Lesson is canceled. No students.
Note that this dialogue and
the dialogues that follow do not
say
"Begin the lesson".
