CODEWITHSUNDEEP
javacollectionsarraylist
user3505394
user3505394

Reputation: 315

Comparing string against multiple arraylis

I want to compare a string against multiple arraylist.

 Say String str;
  ArrayList<String> list1;
  ArrayList<String> list2;

   if(list1.contains(str)

   else if(list2.contains(str)

   else if...

I want to do it in some another way instead of if else ladder.

Any options?

Upvotes: 0

Views: 55

Answers (3)

Farvardin
Farvardin

Reputation: 5424

a tricky solution :

public static void main(String[] args) throws Exception {
    ArrayList<String> l1 = new ArrayList<>();
    ArrayList<String> l2 = new ArrayList<>();
    int i = getIndex("key", l1, l2);
    switch (i) {
    case -1:

        break;
    case 0:

        break;
    case 1:

        break;

    default:
        break;
    }
}

public static int getIndex(String key, ArrayList<String>... arrayLists) {
    for (int i = 0; i < arrayLists.length; i++) {
        if (arrayLists[i].contains(key))
            return i;
    }
    return -1;
}

Upvotes: 0

Karibasappa G C
Karibasappa G C

Reputation: 2732

list2 etc elements into one list using addAll() method...like..

lists.addAll(list1);
lists.addAll(list2)..

now you can iterate your list using for loop for list

for (String ele: lists) {
    if (ele.equals(str) {
        // do whatever you want
    }
}

here you can save the iteration of list of list..

Upvotes: 0

Zoyd
Zoyd

Reputation: 3569

You could have a List of lists :

ArrayList<ArrayList<String>> lists = new ArrayList<>();

lists.add(list1);
lists.add(list2);

then you can write

for (<ArrayList<String> list : lists) {
    if (list.contains(str) {
        // whatever
    }
}

Upvotes: 2

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