Can anyone help please?

Question about the task

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3:Be sure that the id (index) of the added person is displayed on the screen. 5:Be sure that the size of the allPeople list does not change when a person's data is deleted. 6:Be sure that the -i argument displays the person's data.

CrUD: Create, Update, Delete.

The program runs with one of the following sets of arguments:
-c name sex bd -u id name sex bd -d id -i id

Argument values:
name (String)
sex ("m" or "f")
bd (birth date in the following format: "04 15 1990")
-c (adds a person with the specified arguments to the end of allPeople; displays the id on the screen)
-u (updates the data of the person with the specified id)
-d (performs the logical deletion of the person with the specified id; replaces all of its data with null)
-i (displays information about the person with the specified id: name sex (m/f) bd (format Apr 15 1990))

The id corresponds to the index in the list.
All the people should be stored in allPeople.
Use Locale.ENGLISH as the second argument for SimpleDateFormat.

Example arguments:
-c Washington m "04 15 1990"

Example output for the -i argument:
Washington m Apr 15 1990

Requirements:

The Solution class must contain a public static List<Person> field called allPeople.
The Solution class must have a static block where two people are added to the allPeople list.
When you start the program with the -c argument, the program should add the person with the specified arguments to the end of the allPeople list and display the id (index).
When you run the program with the -u argument, the program must update the data of the person with the specified id in the allPeople list.
When you run the program with the -d argument, the program must perform the logical deletion the person with the specified id in the allPeople list.
When you run the program with the -i argument, the program should display the data about the person with the specified id in accordance with the format given in the task.

package com.codegym.task.task17.task1710; public enum Sex { MALE, FEMALE }

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Thomas

Level 41 , Bayreuth , Germany

24 May 2021, 17:29

solution

3. id is size - 1 5. name is a reference as well, why not set that to null, too. 6. you're not supposed to modify (set) anything, you just should get data from the allPeople list. And you need to fix all the exceptions you produce. So the way is: - get the name - get the sex and change it to either m or f - the date and combine everything In more detail: In the list you are storing Person objects, so just create one and save the list entry you grab in a Person (btw, here's the first exception, you used args[0] to get an entry from the list, the second is in the confusing date format). Back to creating the Person object:

Person p = allPeople.get(args[1]);

p.getName() is the name p.getSex() returns MALE or FEMALE, if it's MALE get a m, otherwise a f p.getBirthDate() returns a Date object and that you just format and output the birthday... like:

String bDay = new SimpleDateFormat("MMM dd yyyy", Locale.ENGLISH).format(p.getBirthDate());

(three M cause you do not want to output the month as number but as a short three letter string - see the api doc)

Libby

Level 2 , United Kingdom

26 May 2021, 10:56

I think that by number five the problem was that index was args[0] instead of [1]. But never mind, I fixed it now. Thanks for your help!

Thomas

Level 41 , Bayreuth , Germany

26 May 2021, 12:06

I've mentioned that in my answer for number six as you mixed that up there, too. But never mind, you're welcome ;)