Java Program to Remove Duplicate Entries from an Array using TreeSet

// Java Program to remove duplicates entries
// from  an Array using TreeSet

// Importing Arrays and TreeSet class from
// java.util package
import java.util.Arrays;
import java.util.TreeSet;

// Class to remove duplicates
public class GFG {

    // Main driver method
    public static void main(String[] args)
    {
        // Input custom entries in an array
        // String type
        // Custom inputs
        String[] input
            = new String[] { "Hello",   "hi",     "Wow",
                             "cute",    "thanks", "hi",
                             "Aww",     "cute",   "baby",
                             "beloved", "Aww" };

        // Converting Array to String and printing it
        System.out.print(
            "Initial String Array(Containing Duplicates) : "
            + (Arrays.toString(input)));

        // Creating an object of TreeSet
        TreeSet<String> dupliCheckr = new TreeSet<String>();

        // Adding array elements in TreeSet

        // For added elements in TreeSet
        for (String element : input) {

            // Displaying duplicate entries
            if (!dupliCheckr.add(element)) {

                // Print and display elements in an array
                // which are duplicated.
                System.out.println(
                    "Duplicate Data entered : " + element);
            }
        }

        // Next line
        System.out.println();

        // Print and display elements in an array
        // after removing duplicates from it.
        System.out.println(
            "TreeSet(After Removing Duplicates) : "
            + dupliCheckr);

        // Next line
        System.out.println();

        // Getting size of TreeSet using size() method
        int length = dupliCheckr.size();

        // Converting above TreeSet to arrays
        // Using toArray() method
        input = dupliCheckr.toArray(input);

        // Iterating over array elements
        for (int i = length; i < input.length; i++)
            input[i] = null;

        // Print and display above string array
        // after removing duplicate entries from it
        System.out.println("Final String Array is : "
                           + Arrays.toString(input));
    }
}