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CRUD 2

Java Core, Level 7, Lesson 10

Under discussion

I've solver first CRUD ; The problem in second , I make the same logic with comment , but it not advantage;

Batch CrUD: multiple Creations, Updates, Deletions.

The program runs with one of the following sets of arguments:
-c name1 sex1 bd1 name2 sex2 bd2 ... -u id1 name1 sex1 bd1 id2 name2 sex2 bd2 ... -d id1 id2 id3 id4 ... -i id1 id2 id3 id4 ...

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

The id corresponds to the index in the list.
The birth date format is Apr 15 1990.
All the people should be stored in allPeople.
The order in which data is displayed corresponds to the order in which is input.
Be sure the program is thread safe (works correctly with multiple threads without corrupting the data).
Use Locale.ENGLISH as the second argument for SimpleDateFormat.

Example output for the -i argument with two ids:
Washington m Apr 15 1990 Ross f Apr 25 1997

Requirements:

The Solution class must contain a public volatile List<Person> field called allPeople.
The Solution class must have a static block where two people are added to the allPeople list.
With the -c argument, the program must add all people with the specified arguments to the end of the allPeople list, and display the id of each of them.
With the -u argument, the program must update the data of the people with the specified ids in the allPeople list.
With the -d argument, the program must perform the logical deletion of the people with the specified ids in the allPeople list.
With the -i argument, the program should display data about all the people with the specified ids according to the format specified in the task.
The Solution class's main method must contain a switch statement based on args[0].
Each case label in the switch statement must have a synchronization block for allPeople.

package com.codegym.task.task17.task1711; 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 2 */ public class Solution { public static volatile 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 { SimpleDateFormat forParse = new SimpleDateFormat("MM dd yyyy" , Locale.ENGLISH); SimpleDateFormat pattern = new SimpleDateFormat("MMM dd yyyy" , Locale.ENGLISH); switch(args[0]){ case "-c" : synchronized (allPeople) { // Getting a name for first Person [args1] String name1 = args[1]; // Getting a date for first Person [args3] Date date1 = forParse.parse(args[3]); // Checking sex of the Person if (args[2].equals("m")){ // Add to the end of the list; allPeople.add(Person.createMale(name1 , date1)); } else{ // Add to the end of the list allPeople.add(Person.createFemale(name1 , date1)); } // Saving index for first guy; int index1 = allPeople.size()-1; // Display it System.out.println(index1); // Getting a name for second Person[args4] String name2 = args[4]; // Getting a date for second Person[args4] Date date2 = forParse.parse(args[6]); // Checking sex of the Person if (args[5].equals("m")){ // Add to the end of the list; allPeople.add(Person.createMale(name2 , date2)); } else{ allPeople.add(Person.createFemale(name2 , date2)); } //Getting index of the last person int index2 = allPeople.size()-1; // Display it System.out.println(index2); } break; case "-u" : synchronized (allPeople){ // Gettind the id of the first person; int id1 = Integer.parseInt(args[1]); // Getting this person by id Person person1 = allPeople.get(id1); // Set a name to this person person1.setName(args[2]); // Set a sex to this person Sex sex1 = args[3] == "m" ? Sex.MALE : Sex.FEMALE; person1.setSex(sex1); // Set a birthday to this person Date bd1 = forParse.parse(args[4]); person1.setBirthDate(bd1); // Getting the id of the second person; int id2 = Integer.parseInt(args[5]); // Getting second person by id Person person2 = allPeople.get(id2); // Set a name to this person person2.setName(args[6]); // Set a sex to second person Sex sex2 = args[7] == "m" ? Sex.MALE : Sex.FEMALE; person2.setSex(sex2); // Set a birthday to second person Date bd2 = forParse.parse(args[8]); person2.setBirthDate(bd2); } break; case "-d": synchronized (allPeople){ for (int i = 1 ; i < args.length ; i++){ Person person = allPeople.get(i); person.setName(null); person.setSex(null); person.setBirthDate(null); } } break; case "-i" : synchronized (allPeople){ for (int i = 1 ; i < args.length ; i++){ Person person = allPeople.get(i); System.out.print(person.getName() + " "); String sex = person.getSex() == Sex.MALE ? "m" : "f"; System.out.print(sex + " "); System.out.print(pattern.format(person.getBirthDate())); } } break; } } }

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Jackgai

Level 26 , Tokyo, Japan

18 July 2019, 05:19

It seems you have no loop for creating and updating statement. Just two people can be created or updated. I think this task requires add more than two.