Removing duplicate values from the array list using java -- it contains String compression,List,Hashset techniques

Hi All,

Here I Write a program for Removing duplicate values from the array list using three techniques
1. Normal String compression for finding duplicates from array list 

2. List using to compare string and find & remove duplicates from array list 

3. Hash set method to find and remove the duplicates from the array list.

import java.util.Set;
import java.util.HashSet;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedHashSet;
import java.util.List;

public class removeDuplicateas {

    public static void main(String args[]) {
        String[] value = new String[]{"S", "K", "I", "T", "E", "C", "H", "", "-", "a", "b", "a", "b"};

        /* Normal  string method for find and display the duplicates from array*/
        if (checkDuplicated_withNormal(value)) {
            System.out.println("Array contains duplicate values \n");
        }
         /* Hashset method for find and remove the duplicates from array*/
        if (checkDuplicated_withSet(value)) {
            System.out.println(" \n");
        }

        /* List method using find and remove the duplicates from array*/

        listCheck();

    }

    public static void listCheck() {

        List<String> skilist = (List<String>) Arrays.asList("macos", "windows", "linux", "Android", "", "Boss", "macos", "windows");

        LinkedHashSet<String> lsToset = new LinkedHashSet<String>(skilist);
        List<String> lsWoDuplicates = new ArrayList<String>(lsToset);
        System.out.println("ArrayList size without duplicate: " + lsToset.size());
        System.out.println("ArrayList after removing duplicates in order: " + lsWoDuplicates);
    }

    //check duplicated value using noraml string check method
    private static boolean checkDuplicated_withNormal(String[] value) {
        for (int i = 0; i < value.length; i++) {
            String ValueCheck = value[i];
            if (ValueCheck == null || ValueCheck.equals("")) {
                continue; //empty value ignore condition
            }
            for (int j = 0; j < value.length; j++) {
                if (i == j) {
                    continue;
                }
                String Valuematch = value[j];
                if (ValueCheck.equals(Valuematch)) {
                    return true;
                }
            }

        }
        return false;

    }

    //check Without Duplicate values
    private static boolean checkDuplicated_withSet(String[] values) {
        Set<String> sValueSet = new HashSet<String>();
        for (String temp : values) {
            if (sValueSet.contains(temp)) {
                return true;
            } else if (!temp.equals("")) {
                sValueSet.add(temp);
            }
            System.out.println("Without Duplicate values " + sValueSet.toString());
        }
        return false;
    }
}

output:

~~~~~~~

Array contains duplicate values

Without Duplicate values [S]
Without Duplicate values [S, K]
Without Duplicate values [S, I, K]
Without Duplicate values [T, S, I, K]
Without Duplicate values [E, T, S, I, K]
Without Duplicate values [E, T, S, C, I, K]
Without Duplicate values [E, T, S, C, H, I, K]
Without Duplicate values [E, T, S, C, H, I, K]
Without Duplicate values [E, T, S, C, H, I, -, K]
Without Duplicate values [E, T, S, a, C, H, I, -, K]
Without Duplicate values [E, T, b, S, a, C, H, I, -, K]


ArrayList size without duplicate: 6
ArrayList after removing duplicates in order: [macos, windows, linux, Android, , Boss]