Hash set task 4

src/com/school/faang/hashset/задача_4/ChannnelManager.java

@@ -0,0 +1,58 @@
+package com.school.faang.hashset.задача_4;
+
+import java.util.Set;
+import java.util.HashSet;
+import java.util.HashMap;
+import java.util.Map;
+
+public class ChannnelManager {
+
+    private final Set<String> members;
+    private final Map<String, Role> membersRoles;
+
+    public ChannnelManager() {
+        members = new HashSet<>();
+        membersRoles = new HashMap<>();
+    }
+
+    public void addUser(String userId, Role role) {
+        members.add(userId);
+        membersRoles.put(userId, role);
+    }
+
+    public void addUser(User user) {
+        addUser(user.getId(), user.getRole());
+    }
+
+    public void addUser(String userId, String role) {
+        addUser(userId, Role.valueOf(role));
+    }
+
+    public void removeUser(String userId) {
+        members.remove(userId);
+        membersRoles.remove(userId);
+    }
+
+    public void removeUser(User user) {
+        removeUser(user.toString());
+    }
+
+    public String getRole(String userId) {
+        return membersRoles.get(userId).toString();
+    }
+
+    public String getRole(User user) {
+        if (!membersRoles.containsKey(user.getId())) {
+            throw new IllegalArgumentException("The user " + user.getId() + " is not aa participant of channel");
+        }
+        return membersRoles.get(user.getId()).toString();
+    }
+
+    public boolean hasUser(String userId) {
+        return members.contains(userId);
+    }
+
+    public boolean hasUser(User user) {
+        return members.contains(user.getId());
+    }
+}

src/com/school/faang/hashset/задача_4/Role.java

@@ -0,0 +1,5 @@
+package com.school.faang.hashset.задача_4;
+
+public enum Role {
+    MODERATOR, ADMIN, PARTICIPANT;
+}

src/com/school/faang/hashset/задача_4/Solution.java

@@ -2,6 +2,13 @@
 
 public class Solution {
     public static void main(String[] args) {
-
+        ChannnelManager channnelManager = new ChannnelManager();
+        channnelManager.addUser(new User("id123", "ADMIN"));
+        channnelManager.addUser(new User("id456", "MODERATOR"));
+        channnelManager.addUser(new User("id789", "PARTICIPANT"));
+        System.out.println(channnelManager.hasUser("id789"));
+        System.out.println(channnelManager.getRole("id456"));
+        channnelManager.removeUser("id789");
+        System.out.println(channnelManager.hasUser("id789"));
     }
 }

src/com/school/faang/hashset/задача_4/User.java

@@ -0,0 +1,30 @@
+package com.school.faang.hashset.задача_4;
+
+public class User {
+
+    private Role role;
+
+    private final String id;
+
+    public User(String id, Role role) {
+        this.role = role;
+        this.id = id;
+    }
+
+    public User(String id, String role) {
+        this.id = id;
+        this.role = Role.valueOf(role);
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public Role getRole() {
+        return role;
+    }
+
+    public void setRole(Role role) {
+        this.role = role;
+    }
+}