Решение задачи 2

src/com/school/faang/hashmap/задача_2/Solution.java

@@ -1,7 +1,31 @@
 package com.school.faang.hashmap.задача_2;
 
+import java.util.HashMap;
+import java.util.Map;
+
 public class Solution {
+    public static Map<String, User> users = new HashMap<>();
+
     public static void main(String[] args) {
+        Solution solution = new Solution();
+
+        solution.addUser("@Harry", new User(1, "Гарри Поттер", "31.07.2025"));
+        solution.addUser("@Hermione", new User(2, "Гермиона Грейнджер", "19.09.2025"));
+        solution.addUser("@Ron", new User(3, "Рон Уизли", "01.03.2025"));
+        solution.addUser("@Ron", new User(4, "Рон Уизли", "01.03.2025"));
+
+        for (Map.Entry<String, User> entry : users.entrySet()) {
+            String userName = entry.getKey();
+            String fullName = entry.getValue().getFullName();
+            System.out.printf("Пользователь %s, полное имя: %s.%n", userName, fullName);
+        }
+    }
 
+    public void addUser(String username, User user) {
+        if (users.containsKey(username) && users.containsValue(user)) {
+            System.out.println("Пользователь уже существует.");
+        } else {
+            users.put(username, user);
+        }
     }
 }

src/com/school/faang/hashmap/задача_2/User.java

@@ -0,0 +1,60 @@
+package com.school.faang.hashmap.задача_2;
+
+import java.util.Objects;
+
+public class User {
+    private long userId;
+    private String fullName;
+    private String registrationDate;
+
+    public User(long userId, String fullName, String registrationDate) {
+        this.userId = userId;
+        this.fullName = fullName;
+        this.registrationDate = registrationDate;
+    }
+
+    public long getUserId() {
+        return userId;
+    }
+
+    public void setUserId(long userId) {
+        this.userId = userId;
+    }
+
+    public String getFullName() {
+        return fullName;
+    }
+
+    public void setFullName(String fullName) {
+        this.fullName = fullName;
+    }
+
+    public String getRegistrationDate() {
+        return registrationDate;
+    }
+
+    public void setRegistrationDate(String registrationDate) {
+        this.registrationDate = registrationDate;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof User user)) return false;
+        return userId == user.userId && Objects.equals(fullName, user.fullName) && Objects.equals(registrationDate, user.registrationDate);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(userId, fullName, registrationDate);
+    }
+
+    @Override
+    public String toString() {
+        return "User{" +
+                "userId=" + userId +
+                ", fullName='" + fullName + '\'' +
+                ", registrationDate='" + registrationDate + '\'' +
+                '}';
+    }
+}