ArrayList is a class which implements List interface. It is widely used because of the functionality and flexibility it offers. Most of the developers choose Arraylist over Array as it’s a very good alternative of traditional java arrays.
- ArrayList stores the element’s value alone and internally maintains the indexes for each element.
- ArrayList maintains the insertion order while HashMap doesn’t. Which means ArrayList returns the list items in the same order in which they got inserted into the list.
-
ArrayList allows duplicate elements - ArrayList can have any number of null elements.
- ArrayList get the element by specifying the index of it.
Example Below :
import java.util.ArrayList;
public class Details {
public static void main(String args[]) {
ArrayList<String> arrStr = new ArrayList<String>();
arrStr.add("Item1");
arrStr.add("Item2");
arrStr.add("Item6");
arrStr.add("Item9");
arrStr.add("Item8");
arrStr.add("Item7");
arrStr.add("Item3");
arrStr.add("Item4");
System.out.println("Item in array list are: "+arrStr);
}
}
you will see the result like this :
Item in array list are: [Item1, Item2, Item6, Item9, Item8, Item7, Item3, Item4]
EmoticonEmoticon