Wo werden die App Daten gespeichert

package de.moser.datenbanktest;


import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


import java.text.DateFormat;
import java.util.Date;
import java.util.Locale;


public class MainActivity extends AppCompatActivity {


    private Button btnSubmit;
    private EditText editName;
    private EditText editNachname;
    private EditText editAlter;


    private String strNachname;
    private String strName;
    private String strAlter;


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


        this.btnSubmit = (Button) findViewById(R.id.btnSubmit);
        this.editName = (EditText) findViewById(R.id.editName);
        this.editNachname = (EditText) findViewById(R.id.editNachname);
        this.editAlter = (EditText) findViewById(R.id.editAlter);
    }


    public void ButtonKlick(View v){


        strName= editName.getText().toString();
        strNachname= editNachname.getText().toString();
        strAlter = editAlter.getText().toString();


        //Datenbank-Objekt erzeugen (Constructor legt neue Datenbank an)
        DatenbankErstellen neueDatenbankErstellen;
        neueDatenbankErstellen = new DatenbankErstellen(this);


        //Neuen Datensatz in die Datenbank zufügen
        neueDatenbankErstellen.InsertNewRecord(strName,strNachname,strAlter);
    }
}

package de.moser.datenbanktest;


import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;


public class DatenbankErstellen {
     //DB Name und Version
    private static final String DB_NAME = "TestDB.db";


    private static final int DB_VERSION = 1;


    //DB Splaten
    private static final String TABLE_NAME = "test";
    private static final String COLUMN_ID = "_id";
    private static final String COLUMN_NAME = "name";
    private static final String COLUMN_NACHNAME = "nachname";
    private static final String COLUMN_ALTER = "alter";


    //String für DB-Erstellung zusammenbauen
    private static final String CREATE_DB =
            "CREATE TABLE " + TABLE_NAME + " (" +
                    COLUMN_ID + " INTEGER PRIMARY KEY, " +
                    COLUMN_NAME + " TEXT " +
                    COLUMN_NACHNAME + "INTEGER ," +
                    COLUMN_ALTER + "INTEGER )";


    //Instanz der gekapselten Klasse
    InnerDatenbankErstellen innerDatenbankErstellen;
    private SQLiteDatabase WritableSqLiteDatabase;


    public DatenbankErstellen(Context context) {
        innerDatenbankErstellen = new InnerDatenbankErstellen(context);
        WritableSqLiteDatabase = innerDatenbankErstellen.getWritableDatabase();
    }


    public long InsertNewRecord(String name, String nachname, String alter) {


        ContentValues values = new ContentValues();
        values.put(COLUMN_NAME, name);
        values.put(COLUMN_NACHNAME, nachname);
        values.put(COLUMN_ALTER, alter);


        return WritableSqLiteDatabase.replace(TABLE_NAME, null, values);
    }


    private class InnerDatenbankErstellen extends SQLiteOpenHelper {
        public InnerDatenbankErstellen(Context context) {
            super(context, DB_NAME, null, DB_VERSION);
        }


        @Override
        public void onCreate(SQLiteDatabase db) {
            db.execSQL(CREATE_DB);
        }


        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            db.execSQL("DROP TABLE IF EXIST " + TABLE_NAME);
            onCreate(db);
        }
    }


}