Exception

[Nikhil Jain]

Hello Friends,

As we know that the unchecked exceptions are not required to be declared. So is it necessary to learn the list of unchecked exceptions the java provides.

Thanks
Shashank

[Balazs Borbely]

If you don't know the list of unchecked exceptions then you cannot tell if the code compiles.

i.e.
Will the following code compile?

Case 1

  
public class MainTest {
    public static void main(String[] args) {
            MainTest mainTest = new MainTest();
            mainTest.testException();
    }
 
    public void  testException(){
        throw new UnsupportedOperationException();
    }
}

Case 2

  
import java.io.IOException;
public class MainTest {
    public static void main(String[] args) {
            MainTest mainTest = new MainTest();
            mainTest.testException();
    }
 
    public void  testException(){
        throw new  IOException();
    }
}

[ July 02, 2005: Message edited by: Balazs Borbely ]

[Roger Chung-Wee]

Nobody is expecting you to know all the unchecked exceptions. I don't know which ones you need to know for the exam, but here's a list of the more common ones.

Error
RuntimeException
ArithmeticException
ClassCastException
IllegalArgumentException
IndexOutOfBoundsException
ArrayIndexOutOfBoundsException
NullPointerException