Java arrayList element

Question

I have an issue regarding arrayList element while in looping I have two lists : the first list contains 2 elements : A and B. the second list contains 4 element : A1,B1,B2,B3 Now, what I want is to get from both the list to match their respective elements For example: A -> A1 B -> B1 B -> B2 B -> B3

public class MyArrayList {
    public static void main(String[] args) {
        List listA = new ArrayList<>();
        List listB = new ArrayList<>();
        listA.add("ElementA");
        listA.add("ElementB");
        listB.add("ElementA1");
        listB.add("ElementB1");
        listB.add("ElementB2");
        listB.add("ElementB3");
        listB.add("ElementB4");
        for (int i = 0; i < listA.size(); i++) {
            for (int j = 0; i < listB.size(); j++) {
                System.out.println(listA.get(i) + "-->" + listB.get(j));
            }
        }
    }
}

What do you mean exactly by "respective elements"? And what is actually your problem? — lexicore
– lexicore, Commented Mar 28, 2018 at 10:51
Please never use raw-types (except you must code on Java versions below 1.5). Instead use generics, List<String> for example. — Zabuzard
– Zabuzard, Commented Mar 28, 2018 at 11:06
If you say you have an issue, then clearly state the problem. What does your current code do? Does it throw errors? If so, which? If not, what is its current output and what is the desired? — Zabuzard
– Zabuzard, Commented Mar 28, 2018 at 11:07

xingbin · Accepted Answer · 2018-03-28 11:14:30Z

1

You code got some synax errors. You can print them when element from A is substring of element from B using String.contains().

public class MyArrayList {
    public static void main(String[] args) {
        List listA = new ArrayList<>();
        List listB = new ArrayList<>();
        listA.add("ElementA");
        listA.add("ElementB");
        listB.add("ElementA1");
        listB.add("ElementB1");
        listB.add("ElementB2");
        listB.add("ElementB3");
        listB.add("ElementB4");
        for (Object elementFromFirstList : listA) {
            for (Object elementFromSecondList : listB) {
                if (((String) elementFromSecondList).contains(
                        (String) elementFromFirstList)) {
                    System.out.println(elementFromSecondList + "-->" + elementFromFirstList);
                }
            }
        }
    }
}

edited Mar 28, 2018 at 11:14

answered Mar 28, 2018 at 10:51

xingbin

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2 Comments

gkhaos Over a year ago

you may even shorten it by using for each loops since you never use the iterator value (only for indexing)

statut Over a year ago

I think better to use Set to check on containing elements

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