How to remove duplicates from ArrayList

Here we have chosen LinkedHashSet because it preserves insertion order and also remove duplicate elements

Eg:

public static void main(String[]args){

//creation of Arraylist 1 with string arguments

//adding elements to Arraylist 1

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

al.add("India");

al.add("US");

al.add("Australia");

al.add("Germany");

al.add("Germany");

al.add("Europe");

//Displaying elements of Arraylist

System.out.println(al);

//creating Linked Hash Set

LinkedHashSet<String> lh=new LinkedHashSet<String>();

//adding Arraylist elements   to LinkedHashSet

lh.addAll(al);

//Removing ArrayList elements

al.clear();

//Adding LinkedHashElements to ArrayList

al.addAll(lh);

//Displaying elements of Arraylist

System.out.println(al);

}

Output:[India,US,Australia,Germany,Germany,Europe]

//Non duplicates

Output:[India,US,Australia,Germany,Europe]