#ListIterator returning object instead of integer

18 messages · Page 1 of 1 (latest)

dark night
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Hi guys. I'm working on a little program and it uses two classes. One class is already written- it creates a stack of 5 integers and then calls a method to return the largest value in the stack. I'm trying to write this method.

Inside this method I create a listiterator object to iterate through the stack, but when i do iterator.next() for some reason it returns an "object" and not an integer, even though the stack is of type integer and not just object? But it does throw me an error. I dont understand why its returning me just a plain object

hybrid sequoiaBOT
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dark night
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I think the problem is in the part that has red squiggle

hexed sierra
# dark night

your ListIterator is not parameterized. Parameterize it to Integer using ListIterator<Integer>

dark night
hybrid sequoiaBOT
# dark night Thank you

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dark night
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How would I know that thats what listiterator needs? I didnt see something like that in the api maybe i glossed over it

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I'm still learning to use the java api thing

hexed sierra
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Have a look at generics.

dark night
hexed sierra
dark night
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Thx

dark night
# hexed sierra Have a look at generics.

So does that mean that the list iterator is a method that accepts generics? And when we write <integer> thats our way of working with that method to tell it that our type here is an integer?

hexed sierra
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essentially yes.

dark night
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Thanks

hybrid sequoiaBOT
# dark night Thanks

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