Thread: interface - public void method() throws SomeException;

I need to write the implementation for the following interface. I noticed that "throws SomeException" are marked in the method declaration header. Does it mean I must specify the particular precondition and construct that particular exception object for a throw statement in the method?

public interface MinHeap<E> {

public void insert(E item) throws HeapOverflowException;
public E findMin() throws NoSuchElementException;
public E deleteMin() throws NoSuchElementException;
}

I need to write the implementation for the following interface. I noticed that "throws SomeException" are marked in the method declaration header. Does it mean I must specify the particular precondition and construct that particular exception object for a throw statement in the method?

public interface MinHeap<E>
{
public void insert(E item) throws HeapOverflowException;
public E findMin() throws NoSuchElementException;
public E deleteMin() throws NoSuchElementException;
}

"throws" means just a possibility. It can happen, and it can never happen. By the way, when I want to test something quickly, I often do it in the main method with following signature:

public static void main(String[] args) throws Exception

And it works even if the body does not throw any exception.

Please do not double post your questions

Threads merged

I still need to include the codes in the body to handle the exception either
if (precondition) { throw new SomeException();}
or
try/catch block
right?

if that's the case, why do I need to put "throws Exception" in the method header?

--- Update ---

got it. thanks.