try-catch
try
-catch
public class HelloThere {
public static void main(String[] args) {
try {
System.out.println("Hello " + args[0]);
}
catch (ArrayIndexOutOfBoundsException e) {
System.out.println("Hello Whoever you are.");
}
}
}
What can you do with an exception once you've caught it?
- Fix the problem and try again.
- Do something else instead.
- Exit the application with
System.exit()
- Rethrow the exception.
- Throw a new exception.
- Return a default value (in a non-void method).
- Eat the exception and return from the method (in a void
method).
- Eat the exception and continue in the same method (Rare and
dangerous. Be very careful if you do this. Novices almost always do
this for the wrong reasons. Do not simply to avoid
dealing with the exception. Generally you should only do this if
you can logically guarantee that the exception will never be thrown
or if the statements inside the
try
block do not need
to be executed correctly in order for the following code to
run.)
Printing an error message by itself is generally
not an acceptable response to an exception.