Android Studio SQLite

extends SQLiteDataOpenHelper 的onCreate方法中，db错误

定义错误

    public void onCreate(SQLiteDatabase db) {
        System.out.println("create a Database");
        db.execSQL("create table user(id int, name varchar(20))");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion,int newVersion) {
        System.out.print("update a Database");

    }