 | Chapter 10 |  |
Throw exception
Before we are going to proceed with the exception handling, let's have a look at how it is possible to break the program flow with own usr friendly message when an exception occurs:
static int factor(int n) {
if (n < 0)
throw new IllegalArgumentException("N cannot be negative!"); // an exception is thrown
int result = 1;
for (int i = n; i > 1; i--)
result = result * i;
return result;
}
If n equals to -1, the program flow is interrupted and the following message is printed out:
Exception in thread "main" java.lang.IllegalArgumentException: N cannot be negative!
at Example.factor(Example.java:7)
at Example.main(Example.java:3)
| Chapter 10 | |