How to remove all common character from string array elements in android?

This example demonstrate about How to remove all common character from string array elements in android.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=""
      android:layout_height="match_parent" />

In the above code, we have taken a text view to show array without common character elements.

Step 3 − Add the following code to src/

package com.example.myapplication;

import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;

public class MainActivity extends AppCompatActivity {
   TextView textView;
   String[] strArray = {"aaa", "aaa", "bbb", "ccc", "bbb"};
   @RequiresApi(api = Build.VERSION_CODES.P)
   protected void onCreate(Bundle savedInstanceState) {
      HashMapString, Integer> hashMap = new HashMa<p<>();
      HashSet<String> hashSet = new HashSet<>();
      for (int i = 0; i < strArray.length; i++) {
         if (hashMap.containsKey(strArray[i])) {
            hashMap.put(strArray[i], hashMap.get(strArray[i]) + 1);
         } else {
            hashMap.put(strArray[i], 1);
      for (String name : hashMap.keySet()) {
         String key = name.toString();
         String value = hashMap.get(name).toString();
      HashMap<Character, Integer> hashMap1 = new HashMap<>();
      HashSet<String> hashSet1 = new HashSet<>();
      List<String>list=new ArrayList<>(hashSet);
      for (String name : list) {
         char[] chars=name.toCharArray();
         for (int i = 0; i < chars.length; i++) {
            if (hashMap1.containsKey(chars[i])) {
               hashMap1.put(chars[i],i + 1);
            } else {
               hashMap1.put(chars[i], 1);
         for (Character charValue : hashMap1.keySet()) {
            String key = charValue.toString();
      TextView textView = findViewById(;

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −

Click here to download the project code

Updated on: 30-Jul-2019


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