When must I use throws ISOException at the end of the declaration line?

[marclo]

This is a process method declaration followed by throws ISOException.

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public void process(APDU apdu) throws ISOException 
    {
    ...
    }  

Another process declaration line from the end of which I removed throws ISOException.

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public void process(APDU apdu)
    {
    ...
    } 

What is the difference between the two expression below? When must I use throws ISOException at the end of the declaration line?

[UNKNwYSHSA]

Please read this article first.
https://docs.oracle.com/javase/tutorial ... aring.html

And the ISOException

is an unchecked exception. including it in the throws clause is not mandatory.

ISOException is a RuntimeException:

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public class ISOException extends CardRuntimeException {
public class CardRuntimeException extends RuntimeException {