I have a method, how do I throw an exception. As opposed to try and catch.
Its a basic void method which reads in a file,
public void method(String filename){
//does some stuff to the file here
}
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2 Answers
Easy as:
public void method(String filename) throws Exception
{
if (error)
throw new Exception("uh oh!");
}
or if you want a custom exception:
class MyException extends Exception
{
public MyException(String reason)
{
super(reason);
}
}
public void method(String filename) throws MyException
{
if (error)
throw new MyException("uh oh!");
}
2 Comments
NilsH
And If the exception is an unchecked exception, you don't need the
throws.
acdcjunior
Also, add the constructor with parameter to
MyException.As a first step, I think you need to go through java Exceptions
It depends on what kind of exception you want to throw
If you want to throw an unchecked exception
public void method(String filename){
if(error condition){
throw new RuntimeException(""); //Or any subclass of RuntimeException
}
}
If you want to throw an checked exception
public void method(String filename) throws Exception{ //Here you can mention the exact type of Exception thrown like IOExcption, FileNotFoundException or a CustomException
if(error condition){
throw new Exception(""); //Or any subclass of Exception - Subclasses of RuntimeException
}
}
