EditText saved the value after device rotation automatically

I created a sample application in Android Studio to learn about the life cycle of an Android application. I know that orientation change completely restarts the activity (i.e. OnCreate method is called again). As far as I know, orientation change should have destroyed the context and shown a blank text after device rotation. But somehow without overriding onSaveInstanceState and onRestoreInstanceState methods it is saving the context.

I don't have any fragments. It just the basic template that is provided by Android studio, with few overridden life cycle methods. Here is my MainActivity class:

package com.example.android.a2_screen_orientation_change;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = MainActivity.class.getSimpleName();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.i(TAG, "in method onStart");
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.i(TAG, "in method onResume");
    }

    @Override
    protected void onRestart() {
        super.onRestart();
        Log.i(TAG, "in method onRestart");
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.i(TAG, "in method onPause");
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.i(TAG, "in method onStop");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.i(TAG, "in method onDestroy");
    }
}

Layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.android.a2_screen_orientation_change.MainActivity">

    <EditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

AbdroidManifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.android.a2_screen_orientation_change">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Image: