Insert data in an array list java

Question

I have two lists one is feature and has a placement number based on which i insert data in sorted list e.g if placement number is 5 data will be added in 5th position .i want to add data at 5th postion and to move data which was at 5th position to next index but in my case it just replace data at 5th position not move current data to next position

      for (int i = 0; i < featuredList.size(); i++) {

            int n = featuredList.get(i).getPlacementNumber().intValue();
            if (n < sortedList.size()) {

                    sortedList.add(n, featuredList.get(i));


            } else {
                sortedList.add(featuredList.get(i));
            }


        }

Use ArrayList function addAll and add a new list with your specified item docs.oracle.com/javase/7/docs/api/java/util/… — B. Kemmer
– B. Kemmer, Commented May 5, 2015 at 12:47
Try to use LinkedList : developer.android.com/reference/java/util/LinkedList.html — Hareshkumar Chhelana
– Hareshkumar Chhelana, Commented May 5, 2015 at 12:53

Sumit Singh · Accepted Answer · 2015-05-05 12:57:10Z

3

You should use ArrayList, from add(int index, E element)

Inserts the specified element at the specified position in this list. Shifts the element currently at that position (if any) and any subsequent elements to the right (adds one to their indices).

Make your sortedList as ArrayList:

List<YourType> sortedList= new ArrayList<YourType>();

See the example http://ideone.com/L6hpsf

String s1 = "s1";
String s2 = "s2";
String s3 = "s3";
List<String> list = new ArrayList<String>();
list.add(s1);
list.add(s3);
list.add(1, s2);
System.out.println(list);

Output: [s1, s2, s3]

edited May 5, 2015 at 12:57

answered May 5, 2015 at 12:49

Sumit Singh

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2 Comments

Babar Sanah Over a year ago

i have initialed but it replace data at index instead of adding data at a given index and moving the data to next index

Sumit Singh Over a year ago

Can you give use example and output/expected value of your program?

Hareshkumar Chhelana · Accepted Answer · 2015-05-05 13:01:17Z

1

Try to use LinkedList to insertion or deletion between list for better performance then ArrayList :

private LinkedList<String> linkedList = new LinkedList<String>();

linkedList.add("1");
linkedList.add("2");
linkedList.add("3");
linkedList.add("4");
linkedList.add("5");

// insertion at 3 position
linkedList.add(2,"6");

answered May 5, 2015 at 13:01

Hareshkumar Chhelana

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Comments

Pankaj Dubey · Accepted Answer · 2015-05-05 12:59:51Z

0

Another example which may give you some clue and even easy to run :)

import java.util.ArrayList;


public class Alisttest {
  public static void main(String[] args) {
    ArrayList a = new ArrayList();
    a.add("1");
    a.add("2");
    a.add("3");
    a.add("4");


    System.out.println("a=> "+a.get(2));
    a.add(2, "Pankaj");

    System.out.println("a=> "+a.get(2));
    System.out.println();
    System.out.println("a=> "+a);
}

}

answered May 5, 2015 at 12:59

Pankaj Dubey

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