CODEWITHSUNDEEP
javaarraylistiterator
Renjun Zou
Renjun Zou

Reputation: 101

How to pass content of one iterators to another in Java?

I have two lists a = {1,2,2,5,6,6,6,7} and b = {2,3,3,6,6,6,8} I want to get the equivalent elements, in this case, the output should be 2 *(2 = 2) and 9 * (6 = 6) Here is part of my code

    Iterator aIt = a.iterator();
    Iterator bIt = b.iterator();
    Iterator tempIt = b.iterator();

    int aNode = (Integer)aIt.next();
    int bNode = (Integer)bIt.next();
    Boolean isEquals = false;

    while(aIt.hasNext()||bIt.hasNext()){
        while(aNode<bNode){
            aNode = (Integer)aIt.next();
        }
        while(aNode>bNode){
            bNode = (Integer)bIt.next();
        }
        while(aNode==bNode){
            tempIt = bIt;
            while(aNode==bNode){
                System.out.println(aNode + " = " + bNode);
                bNode = (Integer)tempIt.next();
            }
            aNode = (Integer)aIt.next();
            tempIt = bIt;
            bNode = (Integer)tempIt.next();
            isEquals = true;
        }
        if(isEquals){
            bIt = tempIt;
            isEquals = false;
        }
    }

However after I run the code I realise that what I pass is the reference of bIt to tempIt not the content. Is there any solution if I really want to use iterator to achieve this? Many thanks!

Upvotes: 0

Views: 232

Answers (2)

Peter
Peter

Reputation: 1

I suspect that there's an easier way to do it---namely, not using iterators, but rather by using the lists themselves.

So if your lists A and B are ArrayList<Integer>s, it might look something like this:

public void printMatch(ArrayList<Integer> A, ArrayList<Integer> B) {
    for(int i = 0; i < A.length(); i++) {
        for(int j = 0; j < B.length(); j++) {
            if(A.get(i).equals(B.get(j))) {
                System.out.println("Match!" + A.get(i));
            }
        }
    }
}

Or something along those lines---I've not compiled that, but it's the right idea.

Upvotes: -1

len
len

Reputation: 335

It sounds like you want to clone your iterator, something that is not supported in Java (the clone() method is private). Just as a note, the iterator does not contain the data, you should think of it as an interface to the list. So maybe iterators is not the most ideal solution here.

Upvotes: 2

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