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Question about the task

CRUD

Java Core, Level 7, Lesson 10

Under discussion

I am in trouble about 2 weeks and I can't solve this tasks.

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; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import java.util.Locale; /* CRUD */ public class Solution { public static List<Person> allPeople = new ArrayList<>(); static { allPeople.add(Person.createMale("Donald Chump", new Date())); // id=0 allPeople.add(Person.createMale("Larry Gates", new Date())); // id=1 } public static void main(String[] args) throws ParseException { DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy", Locale.ENGLISH); if (args[0].startsWith("-c")){ if (args[2].equals("m")){ allPeople.add(Person.createMale(args[1] , dateFormat.parse(args[3]))); } if (args[2].equals("f")){ allPeople.add(Person.createFemale(args[1] , dateFormat.parse(args[3]))); } } if (args[0].startsWith("u")){ if (args[3].equals("m")){ allPeople.set(Integer.parseInt(args[1]), Person.createMale(args[2] , dateFormat.parse(args[4]))); } if (args[3].equals("f")){ allPeople.set(Integer.parseInt(args[1]) , Person.createFemale(args[2] , dateFormat.parse(args[4]))); } } if (args[0].startsWith("d")){ int index = Integer.parseInt(args[1]); Person person = allPeople.get(index); person.setName(null); person.setBirthDate(null); person.setSex(null); } if (args[0].startsWith("-i")){ int index = Integer.parseInt(args[1]); Person person = allPeople.get(index); StringBuffer s = new StringBuffer(); s.append(person.getName()); s.append(" "); s.append(person.getSex() == Sex.MALE ? "m" : "f"); s.append(" "); s.append(dateFormat.format(person.getBirthDate())); System.out.println(s.toString()); } } }

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Picvajzmen

Level 20 , Belgrade, Serbia

28 August 2019, 10:53

you are missing the "-" in front of the "u" and "d" in the if() blocks... lines 34 and 42