dublicatearraylist.java

// Java program to remove duplicates from ArrayList

import java.util.*;

public class dublicatearraylist {

	// Function to remove duplicates from an ArrayList
	public static <T> ArrayList<T> removeDuplicates(ArrayList<T> list)
	{

		// Create a new LinkedHashSet
		Set<T> set = new LinkedHashSet<>();

		// Add the elements to set
		set.addAll(list);

		// Clear the list
		list.clear();

		// add the elements of set
		// with no duplicates to the list
		list.addAll(set);

		// return the list
		return list;
	}

	// Driver code
	public static void main(String args[])
	{

		// Get the ArrayList with duplicate values
		ArrayList<Integer>
			list = new ArrayList<>(
				Arrays
					.asList(1, 10, 1, 2, 2, 3, 10, 3, 3, 4, 5, 5));

		// Print the Arraylist
		System.out.println("ArrayList with duplicates: "
						+ list);

		// Remove duplicates
		ArrayList<Integer>
			newList = removeDuplicates(list);

		// Print the ArrayList with duplicates removed
		System.out.println("ArrayList with duplicates removed: "
						+ newList);
	}
}