CODEWITHSUNDEEP
javaarraylistiterator
james11
james11

Reputation: 31

Copying specified objects from one ArrayList to another

I currently have an ArrayList holding "Product" objects which contain a string, integer and double within each object. I want to be able to search through the objects using a parameter, to pick out the ID (integer value) which matches the search parameter and to copy this object into another ArrayList. Is it possible to do this through an Iterator or is there an easier way of doing this?

Upvotes: 1

Views: 2049

Answers (3)

roeygol
roeygol

Reputation: 5028

Simple stright forward solution for Java less them 8 version:

ArrayList<Product> arrOriginal = new ArrayList<Product>(); //with values of yours

ArrayList<Product> arrCopy = new ArrayList<Product>(); //empty

for (Product item : arrOriginal){
    if (<some condition>){
        arrCopy.add(item);
    }

}

Upvotes: 1

John Britto
John Britto

Reputation: 457

ArrayList<Product> arrListOriginal = new ArrayList<Product>();
arrListOriginal.add(item1);
arrListOriginal.add(item2);
arrListOriginal.add(item3);

ArrayList<Product> arrListCopy = new ArrayList<Product>();
Product objProduct = new Product();
for (int index=0;index<arrListOriginal.size();index++){
    objProduct = (Product) arrListOriginal.get(index);
    if (<search condition with objProduct>){
        arrListCopy.add(objProduct);
    }
}

Upvotes: 0

Marko Topolnik
Marko Topolnik

Reputation: 200148

The easy way is using Java 8 streams:

List<Product> filtered = 
   prods.stream().filter(p -> p.getId() == targetId).collect(toList());

Assuming import static java.util.stream.Collectors.toList;

Upvotes: 2

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