diff --git a/app/src/main/java/fr/imt_atlantique/myfirstapplication/User.java b/app/src/main/java/fr/imt_atlantique/myfirstapplication/User.java
index 56620dc5dca672b09f29ee4b167440aef91aea08..863d36009365bef96354206949c1298e46b06692 100644
--- a/app/src/main/java/fr/imt_atlantique/myfirstapplication/User.java
+++ b/app/src/main/java/fr/imt_atlantique/myfirstapplication/User.java
@@ -4,10 +4,14 @@ import android.os.Build;
 import android.os.Parcel;
 import android.os.Parcelable;
 
+import androidx.annotation.NonNull;
+
 import java.text.DateFormat;
 import java.time.LocalDate;
 import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Date;
 
 public class User implements Parcelable {
     private String firstName;
@@ -17,15 +21,21 @@ public class User implements Parcelable {
     private LocalDate birthDate;
     private String[] phoneNumbers;
 
-    public User(String firstName, String lastName, String birthCity, String birthDept, LocalDate birthDate, String[] phoneNumbers) {
-        this.firstName = firstName;
-        this.lastName = lastName;
-        this.birthCity = birthCity;
-        this.birthDept = birthDept;
-        this.birthDate = birthDate;
-        this.phoneNumbers = phoneNumbers;
+    public User(String firstName, String lastName, String birthCity, String birthDept, LocalDate birthDate, String[] phoneNumbers) throws Exception {
+        try {
+            setFirstName(firstName);
+            setLastName(lastName);
+            setBirthCity(birthCity);
+            setBirthDept(birthDept);
+            setBirthDate(birthDate);
+            setPhoneNumbers(phoneNumbers);
+        } catch (Exception e) {
+            throw new IllegalArgumentException(e.getMessage());
+        }
     }
 
+
+
     protected User(Parcel in) {
         firstName = in.readString();
         lastName = in.readString();
@@ -86,4 +96,75 @@ public class User implements Parcelable {
     public String[] getPhoneNumbers() {
         return phoneNumbers;
     }
+
+    public void setFirstName(String firstName) {
+        if (firstName.isEmpty()) {
+            throw new IllegalArgumentException("The first name can not be empty.");
+        }
+        this.firstName = capitalizeFirstLetter(firstName);
+    }
+
+    public void setLastName(String lastName) {
+        if (lastName.isEmpty()) {
+            throw new IllegalArgumentException("The last name can not be empty.");
+        }
+        this.lastName = capitalizeFirstLetter(lastName);
+    }
+
+    public void setBirthCity(String birthCity) {
+        if (birthCity.isEmpty()) {
+            throw new IllegalArgumentException("The birth city can not be unspecified.");
+        }
+        this.birthCity = capitalizeFirstLetter(birthCity);
+    }
+
+    public void setBirthDept(String birthDept) {
+        if (birthDept.isEmpty()) {
+            throw new IllegalArgumentException("The birth department can not be unspecified.");
+        }
+        this.birthDept = capitalizeFirstLetter(birthDept);
+    }
+
+    public void setBirthDate(LocalDate birthDate) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            if (birthDate != null && birthDate.isAfter(LocalDate.now())) {
+                throw new IllegalArgumentException("The birth date cannot be in the future.");
+            }
+        }
+        this.birthDate = birthDate;
+    }
+
+    public void setPhoneNumbers(String[] phoneNumbers) {
+        this.phoneNumbers = phoneNumbers;
+    }
+
+    @NonNull
+    @Override
+    public String toString() {
+        return "User{"
+                + "firstName='"
+                + firstName
+                + '\''
+                + ", lastName='"
+                + lastName
+                + '\''
+                + ", birthCity='"
+                + birthCity
+                + '\''
+                + ", birthDept='"
+                + birthDept
+                + '\''
+                + ", birthDate="
+                + birthDate
+                + ", phoneNumbers="
+                + Arrays.toString(phoneNumbers)
+                + '}';
+    }
+
+    private String capitalizeFirstLetter(String input) {
+        if (input == null || input.isEmpty()) {
+            return input;
+        }
+        return input.substring(0, 1).toUpperCase() + input.substring(1);
+    }
 }