Java Reference
In-Depth Information
Display 9.8
Catching Multiple Exceptions
(part 2 of 3)
8
try
9
{
10
System.out.println("How many pencils do you have?");
11
int
pencils = keyboard.nextInt();
12
if
(pencils < 0)
13
throw
new
NegativeNumberException("pencils");
14
System.out.println("How many erasers do you have?");
15
int
erasers = keyboard.nextInt();
16
double
pencilsPerEraser;
17
if
(erasers < 0)
18
throw
new
NegativeNumberException("erasers");
19
else
if
(erasers != 0)
20
pencilsPerEraser = pencils/(
double
)erasers;
21
else
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throw
new
DivisionByZeroException();
23
System.out.println("Each eraser must last through "
24
+ pencilsPerEraser + " pencils.");
25
}
26
catch
(NegativeNumberException e)
27
{
28
System.out.println("Cannot have a negative number of "
29
+ e.getMessage());
30
}
31
catch
(DivisionByZeroException e)
32
{
33
System.out.println("Do not make any mistakes.");
34
}
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System.out.println("End of program.");
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}
37
}
Sample Dialogue 1
How many pencils do you have?
5
How many erasers do you have?
2
Each eraser must last through 2.5 pencils
End of program.
(continued)
