Iterator Problems

[haroldjclements]

I have a problem with the Iterator in J#. In standard Java this code would have run through all the elements in �myVector� and would have worked fine. I have imported both java.util.Vector and java.util.Iterator.

 

Iterator myIterator = myVector.iterator();
while (myIterator.hasNext())
{
AnObject myObject = (AnObject) myIterator.next();
} 

 

In J# I receive this error and I don�t know how to fix it

 

Cannot find method 'iterator()' in 'java.util.Vector'

 

If anyone has any clues I would be very grateful.

 

Thanks in advance,

Harold Clements

[Winston]

If you haven't noticed Java's Vector Class by default doesn't have a method for returning an iterator. It does however inherit off AbstractList, which in essence has a listIterator method, but i don't think the Vector class actually provided implementation to return a listIterator of all the objects inside the list. Generally iterators in Java are used on for example LinkedList's which is farily popular to use iterators on, and LinkedList has a method which returns it called the listIterator() method.

 

To traverse a Vector list just simply do it as if you were doing it with a ArrayList, Vector in Java is essentially the same as an ArrayList i think except it's synchronized.

[haroldjclements]

What I was really trying to get at was that the above code (using an iterator with a vector) works fine if you were programming with the Java JDK1.4.2. However in J# some methods (which are available in Java) are not in J#. For example there is also a 'get' method in the JDK version of Vector with in non-existent in J#, which makes it very hard to migrate.

[Winston]

What I was really trying to get at was that the above code (using an iterator with a vector) works fine if you were programming with the Java JDK1.4.2. However in J# some methods (which are available in Java) are not in J#. For example there is also a 'get' method in the JDK version of Vector with in non-existent in J#' date=' which makes it very hard to migrate.[/quote']

 

 

Yeah i know what you mean... but the reason why they don't have some of the methods, or probably they do is compatibility reasons with the framework, because in other languages like C# it's rather similar to Java, and to make it cross compatible, they standardise some of the method naming i think... so in J# instead of the get method we have the elementAt method.

[haroldjclements]

Thanks Winston, I feel a little stupid as I know the �elementAt� and have used it in my Java applications numerous times just did not associate it with the �get� method.

 

It takes me back to the early days of learning Java when the tutor said to me �There is sometimes more then one method in the class that does, more of less, the same thing. That�s why they keep deprecating methods in each new version�.

 

Well am happy now, I have been stuck on this for a while now.

 

Cheers again,

Harold Clements