how can i save the date???

Question about the task

Yet another adapter

Java Core, Level 9, Lesson 3

Resolved

Pls, hint with explanation, tk you! :)

Adapt Scanner to the PersonScanner interface.
The adapter class is PersonScannerAdapter.
Create a private final Scanner field called fileScanner in the adapter class.
Initialize the field in a constructor with one Scanner parameter.

The file stores data in the following format:
John Michael Peterson 12 31 1950
Larry Thomas Gates 12 31 1957

The file contains information about a lot of people. Each line has data for a single person. The read() method must read only one person's information.

Requirements:

PersonScanner must be an interface.
The PersonScannerAdapter class must implement the PersonScanner interface.
The PersonScannerAdapter class must have a private Scanner field called fileScanner.
The PersonScannerAdapter class must have a constructor with a Scanner parameter.
The PersonScannerAdapter class's close() method must delegate the call to fileScanner.
The PersonScannerAdapter class's read() method should read a line from the file, parse it, and return only one person's data as an Person object.

package com.codegym.task.task19.task1904; import java.io.IOException; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Locale; import java.util.Scanner; /* Yet another adapter */ public class Solution { public static void main(String[] args) { } public static class PersonScannerAdapter implements PersonScanner { private Scanner fileScanner; public PersonScannerAdapter(Scanner fileScanner){ this.fileScanner = fileScanner; } @Override public Person read() throws IOException { Person person1 = null; String person = fileScanner.nextLine();//read next line(nextPerson) String lastName = person.substring(0, person.indexOf(" "));//save text until first space person = person.substring(lastName.length()+1);//read from lastName.length()+1 String middleName = person.substring(0, person.indexOf(" "));//save text until first space person = person.substring(middleName.length()+1);//... String firstName = person.substring(0, person.indexOf(" "));//... String birthDate = person.substring(firstName.length()+1);//read text from firstName.length()+1 //how can i save the date(birthDate) in format MM DD YYYY??? return new Person(firstName, middleName, lastName, birthDate);//not string, but Date tipe!? } @Override public void close() throws IOException { fileScanner.close(); } } }

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Ramen

Level 23 , South Lake Tahoe, United States

28 April 2023, 06:16

You need to use something like SimpleDateFormat to format the String into a Date object. The parser will throw an exception. I wrapped it in a try-catch, and this worked.

Nouser

Level 36 , Germany

27 August 2020, 15:04

either

Date date = new Date(int year, int month, int date);

or use SDF

Date date = new SimpleDateFormat("MMddyyyy", Locale.ENGLISH).parse(month + day + year);

may in the end look similar to:

public Person read() throws IOException {
    //do we have a next line?
    if (!fileScanner.hasNextLine()) return null;

    //Read next line, split and save parts in part array
    String[] part = fileScanner.nextLine().split("\\s+");
    //lineParts     0          1           2           3           4           5
    //              LastName   FirstName   MiddleName  Month       Day         Year

    Date date = null;
    try {
        date = new SimpleDateFormat("MMddyyyy").parse(part[3] + part[4] +part[5]);
    } catch (ParseException ignore) {}

    return new Person(part[2], part[0], part[1], date);
}

Angel Stefan Arjoca

Level 26 , Bucharest, Romania

27 August 2020, 17:32

Tk you! Great solution! In the end i change the order to replicate the constructor of Person class from lastName, middleName, firstName, birthDate to ...firstName, middleName... in read(); Is not enough only to return in the specific order. Tk you! Great solution!

Lawson

Level 29 , Lagos, Nigeria

4 September 2020, 12:23

Bro pls i tried ur method and it didnt work