How do I correct "cannot resolve method findviewbyid" not using fragment

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Java

Android

I am using findviewbyid but it is not working.I gave an id in xml file by the name of rootView .I also created textview to display the text in this activity but it is not working.Please help...below is the code

package com.example.android.miwok;

    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.LinearLayout;
    import android.widget.TextView;
    
    import java.util.ArrayList;
    
    public class NumbersActivity extends AppCompatActivity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_numbers);
            // array created
    
            /*String[] words= new String[10];
            words[0]="one";
            words[1]="two";
            words[2]="three";
            words[3]="four";
            words[4]="five";
            words[5]="six";
            words[6]="seven";
            words[7]="eight";
            words[8]="nine";
            words[9]="ten";*/
    
            // arraylist created
    
            ArrayList<string> words =new ArrayList<string>();
            words.add("one");
            words.add("two");
            words.add("three");
            words.add("four");
            words.add("five");
            words.add("six");
            words.add("seven");
            words.add("eight");
            words.add("nine");
            words.add("ten");
    
            LinearLayout rootView=(LinearLayout)findViewById(R.id.rootView);
            TextView wordView=new TextView(this);
            wordView.setText(words.get(0));
            rootView.addView(wordView);
            return rootView;
    
            // logs created
    
            /*Log.v("NumbersActivity", "Word at index 0: "+ words.get(0));
            Log.v("NumbersActivity","Word at index 1: "+ words.get(1));
            Log.v("NumbersActivity","Word at index 2: "+ words.get(2));
            Log.v("NumbersActivity","Word at index 3: "+ words.get(3));
            Log.v("NumbersActivity","Word at index 4: "+ words.get(4));
            Log.v("NumbersActivity","Word at index 5: "+ words.get(5));
            Log.v("NumbersActivity","Word at index 6: "+ words.get(6));
            Log.v("NumbersActivity","Word at index 7: "+ words.get(7));
            Log.v("NumbersActivity","Word at index 8: "+ words.get(8));
            Log.v("NumbersActivity","Word at index 9: "+ words.get(9));*/
    
    
    
        }
    }

XML

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/rootView"
        android:orientation="vertical"
        tools:context=".NumbersActivity">

What I have tried:

i researched and always find the code where fragments were used but i am not using fragment.