diff --git a/Extension/.gitignore b/Extension/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/Extension/.gitignore
@@ -0,0 +1,38 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/Extension/.idea/.gitignore b/Extension/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/Extension/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/Extension/.idea/encodings.xml b/Extension/.idea/encodings.xml
new file mode 100644
index 0000000..aa00ffa
--- /dev/null
+++ b/Extension/.idea/encodings.xml
@@ -0,0 +1,7 @@
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Extension/.idea/misc.xml b/Extension/.idea/misc.xml
new file mode 100644
index 0000000..df00c07
--- /dev/null
+++ b/Extension/.idea/misc.xml
@@ -0,0 +1,14 @@
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Extension/.idea/vcs.xml b/Extension/.idea/vcs.xml
new file mode 100644
index 0000000..68844c5
--- /dev/null
+++ b/Extension/.idea/vcs.xml
@@ -0,0 +1,7 @@
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Extension/lab-java-exceptions b/Extension/lab-java-exceptions
new file mode 160000
index 0000000..c30179c
--- /dev/null
+++ b/Extension/lab-java-exceptions
@@ -0,0 +1 @@
+Subproject commit c30179c81c9259420be8c44a86c82d9b7f7e32c9
diff --git a/Extension/pom.xml b/Extension/pom.xml
new file mode 100644
index 0000000..6659144
--- /dev/null
+++ b/Extension/pom.xml
@@ -0,0 +1,31 @@
+
+
+ 4.0.0
+
+ org.example
+ Extension
+ 1.0-SNAPSHOT
+
+
+ 17
+ 17
+ UTF-8
+
+
+
+
+ org.junit.jupiter
+ junit-jupiter-api
+ 5.7.1
+ test
+
+
+ org.junit.jupiter
+ junit-jupiter-engine
+ 5.7.1
+ test
+
+
+
\ No newline at end of file
diff --git a/Extension/src/main/java/org/example/Main.java b/Extension/src/main/java/org/example/Main.java
new file mode 100644
index 0000000..b39b37f
--- /dev/null
+++ b/Extension/src/main/java/org/example/Main.java
@@ -0,0 +1,28 @@
+package org.example;
+
+public class Main {
+ public static void main(String[] args) {
+
+ PersonsList personList = new PersonsList();
+
+ try{
+ personList.getList().add(new Person(1, "John Doe", 30, "Software Developer"));
+ personList.getList().add(new Person(2, "Jane Doe", 25, "Software Developer"));
+ personList.getList().add(new Person(3, "John Smith", 35, "Wifi Hacker"));
+
+ for(Person p : personList.getList()){
+ Person p1 = personList.findByName(p.getName());
+ System.out.println("Found: " + p1);
+
+ Person clonedPerson = personList.clone(p);
+ System.out.println("Cloned: " + clonedPerson);
+
+ personList.writePersonToFile(p);
+ }
+ }
+ catch (Exception e){
+ System.out.println("Error: " + e.getMessage());
+ }
+
+ }
+}
diff --git a/Extension/src/main/java/org/example/Person.java b/Extension/src/main/java/org/example/Person.java
new file mode 100644
index 0000000..1503bfb
--- /dev/null
+++ b/Extension/src/main/java/org/example/Person.java
@@ -0,0 +1,81 @@
+package org.example;
+
+import java.util.Objects;
+
+public class Person {
+
+ //PRIVATE PROPERTIES
+ private int id;
+ private String name;
+ private int age;
+ private String occupation;
+
+ //CONSTRUCTOR
+ public Person(int id, String name, int age, String occupation){
+ try {
+ setId(id);
+ setName(name);
+ setAge(age);
+ setOccupation(occupation);
+ } catch (Exception e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ //GETTERS AND SETTERS
+ public int getId() {
+ return id;
+ }
+
+ public void setId(int id) {
+ this.id = id;
+ }
+
+ public String getName() {
+ return name;
+ }
+
+ public void setName(String name) {
+ this.name = name;
+ }
+
+ public int getAge() {
+ return age;
+ }
+
+ public void setAge(int age) {
+ if(age < 0) {
+ throw new IllegalArgumentException("Age must be greater than 0");
+ }
+ this.age = age;
+ }
+
+ public String getOccupation() {
+ return occupation;
+ }
+
+ public void setOccupation(String occupation) {
+ this.occupation = occupation;
+ }
+
+ //METHODS
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+ if (o == null || getClass() != o.getClass()) return false;
+ Person person = (Person) o;
+ return age == person.age && Objects.equals(name, person.name) && Objects.equals(occupation, person.occupation);
+ }
+
+ @Override
+ public String toString() {
+ return "Person{" +
+ "id=" + id +
+ ", name='" + name + '\'' +
+ ", age=" + age +
+ ", occupation='" + occupation + '\'' +
+ '}';
+ }
+
+
+}
\ No newline at end of file
diff --git a/Extension/src/main/java/org/example/PersonsList.java b/Extension/src/main/java/org/example/PersonsList.java
new file mode 100644
index 0000000..0d37f6a
--- /dev/null
+++ b/Extension/src/main/java/org/example/PersonsList.java
@@ -0,0 +1,48 @@
+package org.example;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.io.FileWriter;
+import java.io.PrintWriter;
+import java.io.IOException;
+import java.util.UUID;
+
+public class PersonList {
+ private List list = new ArrayList<>();
+
+
+ //METHODS
+ public Person findByName(String n) {
+ if (n.split(" ").length != 2)
+ throw new IllegalArgumentException("Invalid name format. It should be 'firstName lastName'.");
+
+ for (Person p : list) {
+ if (p.getName().equals(n)) {
+ return p;
+ }
+ }
+ return null;
+ }
+
+ public Person clone(Person p) {
+ return new Person(UUID.randomUUID().hashCode(), p.getName(), p.getAge(), p.getOccupation());
+
+ }
+
+ public void writePersonToFile (Person p) {
+ try{
+ FileWriter fileWriter = new FileWriter("person.txt");
+ PrintWriter printWriter = new PrintWriter(fileWriter);
+ printWriter.println(p.toString());
+ printWriter.close();
+ }catch (IOException e){
+ System.out.println("Error: " + e.getMessage());
+ }
+
+ }
+
+ //ARRAYLIST METHODS
+ public List getList(){
+ return list;
+ }
+}
\ No newline at end of file
diff --git a/Extension/src/test/java/PersonTest.java b/Extension/src/test/java/PersonTest.java
new file mode 100644
index 0000000..8e14671
--- /dev/null
+++ b/Extension/src/test/java/PersonTest.java
@@ -0,0 +1,38 @@
+package org.example;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PersonListTest {
+
+ @Test
+ void findByName1() {
+ PersonList personList = new PersonList();
+ Person p = new Person(1, "Jenna Doe", 30, "Software Developer");
+ personList.getList().add(p);
+ Person foundPerson = personList.findByName("Jenna Doe");
+ assertEquals(p, foundPerson);
+ }
+
+ @Test
+ void findByName2() {
+ PersonList personList = new PersonList();
+ Person p = new Person(1, "Jenna Doe", 30, "Software Developer");
+ personList.getList().add(p);
+ assertThrows(IllegalArgumentException.class, () -> personList.findByName("Jenna_Doe"));
+ }
+
+ @Test
+ void testClone() {
+ PersonList personList = new PersonList();
+ Person p = new Person(1, "John Doe", 30, "Software Developer");
+ Person clonedPerson = personList.clone(p);
+ assertEquals(p.getName(), clonedPerson.getName());
+ assertEquals(p.getAge(), clonedPerson.getAge());
+ assertEquals(p.getOccupation(), clonedPerson.getOccupation());
+ assertNotEquals(p.getId(), clonedPerson.getId());
+
+
+ }
+}
\ No newline at end of file