Creating an arraylist with words and comparing it to a message inputted from the user

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I am new to java and i am building an android studio application. I have a chat where the user can input a message. Is it possible to create an array list containing certain words. eg.

List listL = new ArrayList<>();




And if the user has inputted any of these words i can prompt a message. Eg: If the user has inputted "one".

I have tried

if (message.contains((CharSequence) listL)){

            Toast.makeText(Chat.this,"This message contains a word on the array list", Toast.LENGTH_LONG).show();

My Application Then crashes with the following error.

java.lang.ClassCastException: java.util.ArrayList cannot be cast to java.lang.CharSequence

Any help would be much appreciated.

If you want to check the text when some button clicked. you can use this code in your button's onClickListener

//show your message

You currently trying to find your list in your input text but you need to try find your input text in your list and you can't cast your list to CharSequence because it's Arraylist.

If you want to watch your edittext for changes, use

edittext.addTextChangedListener(new TextWatcher() {

public void onTextChanged(CharSequence s, int start, int before,
        int count) {
        if(list.contains(s)) { 
            //do your work here 

public void beforeTextChanged(CharSequence s, int start, int count,
        int after) {


public void afterTextChanged(Editable s) {



ArrayList in java with example programs, Arraylist class implements List interface and it is based on an Array data structure . This statement creates an ArrayList with the name alist with type “String”. We can use the set method to change an element in ArrayList. I want to compare arraylist with my string input in if statement. if condition becomes true then it� ArrayList<Document> someStuff = new ArrayList<Document> (); The application prompts the user for lastname, firstname, code and then uses those values to create new Document object, which it then adds to the list. It may be clearer if we break the statement down into smaller steps.

You should be checking if the list contains the input, rather than the other way around,

if (listL.contains(message))

Custom ArrayList in Java, Hashing � Graph � Advanced Data Structure � Matrix � Strings � All Data Structures Custom ArrayList: A custom arraylist has attributes based on user Consider a case when we have to take input as N number of students and details are: Build an ArrayList Object and place its type as a Class Data. 0 Creating an arraylist with words and comparing it to a message inputted from the user Apr 26 '19. View all questions and answers → Badges (8) Gold —

In this line (message.contains((CharSequence) listL)) you are trying to cast a list to a CharSequence and you are passing it to the contains method. The exception is telling you that you cannot cast a list to a CharSequence.

What you should do is listL.contains(message).

Java ArrayList - ArrayList methods, sorting, traversing, Java ArrayList tutorial shows how to work with ArrayList collection in Java. the elements to this data type; in our case, we have a list of strings. Since Java 9, we have a couple of factory methods for creating lists having a handful of elements. We use the removeIf method to delete all negative values. The Add method on ArrayList appends a new item/element object to the end of the ArrayList. You can add elements in the ArrayList until memory runs out. The objects are stored in the managed heap. Let’s see an example of creating an ArrayList and add two elements using the Add() method of ArrayList.

We'll the answer is quite simple. You are casting a List to a CharSequence which is off course impossible.

You should be checking the list if it contains the String (or CharSequence).

if (listL.contains(message)) {

Also you might want to use a Set for this. It is a collection of non-duplicate elements.

Set<String> listL = new HashSet<String>();


if (listL.contains(message)) {

How to Compare Two ArrayList in Java, How to Compare Two ArrayList in Java with oops, string, exceptions, Get input from user in Java Read file line by line in Java Take String input in Java How to Read Excel We have added another element in the secondList to create a difference It returns a Collector which collects all the input elements into a List, in an� I'm trying to create a program that prompts the user to put in several different numbers. I'd like to put those numbers into an array for easy use. To save me time on coding, I want to loop the request for user input. Would I use a for loop and use the subscript in the array to make changes as needed? Please help.

Please try this:

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

for (String mWord : listL) {
    if (listL.contains((message))){

listFilter is filter array list

Array User Input using For Loop, You will learn how to create an array, how to read input for the all array elements from user Duration: 9:04 Posted: Jul 7, 2014 Asks the user for values using prompt and stores the values in the array. Finishes asking when the user enters a non-numeric value, an empty string, or presses “Cancel”. Calculates and returns the sum of array items. P.S. A zero 0 is a valid number, please don’t stop the input on zero. Run the demo. solution

1. Get a single line of user input. Is there a method on Scanner that you can use for this? 2. Take that line and split it up into a set of different numbers extracted from that line. There are several ways to do this, but I would suggest creating a new Scanner, that takes the line (a String) as input. Does that help?

Hello, all. I am trying to create an ArrayList of ArrayLists that hold stats about many different people (in order [First_LastName, Social Security Number, Income, Disbersement, Dependends]). I am creating this ArrayList of ArrayLists from a file as inputted by the user.

Hi hughveal: If you plan to make a manual comparison of your Word objects, then you do not need to implement the Comparable interface, nor you need a compareTo method, you could use any other method for that purpose. But if you plan to make a list (e.g. ArrayList<Word>) of Words, and then have them sorted. You have two choices.