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This task should be so easy so why HashMap is not correct? Why also if I call 2 methods in main class something is wrong?

1. Create a Map<String, String> and add 10 people represented by (last name, first name) pairs.
2. Among these 10 people, let there be people who share the same first names.
3. Among these 10 people, let there be people who share the same last names.
4. Display the contents of the Map on the screen.

Requirements:

The program should display text on the screen.
The Solution class must have only three methods.
The createPeopleMap() method must create and return a Map with (String, String) elements. Also, add 10 people to the map.
In the createPeopleMap() method, you need to add people with the same last name.
In the createPeopleMap() method, you need to add people with the same first name.
The printPeopleMap() method should display all people in the Map. Display each value on a new line. The last name and first name should be separated by a space.
The main() method should call the createPeopleMap() method.
The main() method should call the printPeopleMap() method.

package com.codegym.task.task08.task0821; import java.util.HashMap; import java.util.Map; /* Shared last names and first names */ public class Solution { public static Map<String, String> createPeopleList() { Map<String, String> people = new HashMap<String, String>() {{ put("Aaa", "Brian"); put("Bbb", "Casey"); put("Ccc", "Eliot"); put("Ddd", "Justin"); put("Eee", "Mitch"); put("Fff", "Tyler"); put("Ggg", "Tom"); put("Hhh", "Nick"); put("Jjj", "Tyler"); put("Aaa", "Lucas"); }}; return people; } public static void printPeopleList(Map<String, String> map) { for (Map.Entry<String, String> s : map.entrySet()) { System.out.println(s.getKey() + " " + s.getValue()); } } public static void main(String[] args) { Map<String, String> map = createPeopleList(); printPeopleList(map); } }

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Gellert Varga

Level 23 , Szekesfehervar, Hungary

16 July 2020, 20:05

1.) The requirements talk about "createPeopleMap() method". But where is this in your program? I can't see it. 2.) Have you tried the program? Have you counted how many item-pairs there are in the output? (Do it!) We learned this: All the keys of the HashMap should be unique. If you try to put two or more equal keys, then the new one will overwrite the previous one.