Intoroduction to Kotlin session, held at Menoufiya University on 31-10-2019 at the Software Freedom Day 2019

1. Kotlin Everywhere
By Ahmed Nabil (AhmedNMahran)

2. Content
1. About Me
2. Me and Kotlin
3. Kotlin Platforms
4. Kotlin and Java
5. Questions

4. About Me
● Writing code from the age of 11 :)
● Participated in a lot of programs from Microsoft and Google.
● Participated in many hackathons.
● Former Android Developer at Hungerstation | Delivery Hero.
● Android Team Lead at Generation C.
● Founder and Leader of The Egyptian Kotlin Community (Kotlin Egypt).

6. Me And Kotlin

7. Me And Kotlin

8. What Is Kotlin
● Named after Kotlin Island in Russia
● Developed by Jetbrains. 2010
● Statically Typed Language
● Became First-class language for Android since 2017

9. Programming language for

10. Why Kotlin?

11. Model In Java !
public class Customer {
private String name;
private String email;
private String company;
public Customer(String name) {
this(name, "", "");
}
public Customer(String name, String email) {
this(name, email, "");
}

12. Still in Java
public Customer(String name, String email, String company) {
this.name = name;
this.email = email;
this.company = company;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}

13. And… Java :D
public void setEmail(String email) {
this.email = email;
}
public String getCompany() {
return company;
}
public void setCompany(String company) {
this.company = company;
}

14. Java.. too
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Customer customer = (Customer) o;
if (name != null ? !name.equals(customer.name) : customer.name != null) return false;
if (email != null ? !email.equals(customer.email) : customer.email != null) return false;
return company != null ? company.equals(customer.company) : customer.company == null;
}

15. Finally, end of java code
@Override
public int hashCode() {
int result = name != null ? name.hashCode() : 0;
result = 31 * result + (email != null ? email.hashCode() : 0);
result = 31 * result + (company != null ? company.hashCode() : 0);
return result;
}
@Override
public String toString() {
return "Customer{" +
"name='" + name + ''' +
", email='" + email + ''' +
", company='" + company + ''' +
'}';
}
}

16. In Kotlin
data class Customer(var name: String, var email: String = "",
var company: String = "")

17. Resources
● https://kotlinlang.org
● https://en.wikipedia.org/wiki/Kotlin
● https://android.jlelse.eu/kick-starting-android-development-with-kotlin-diving-in
to-kotlin-code-35e2637c7eda
● https://android-developers.googleblog.com/2017/05/android-announces-supp
ort-for-kotlin.html

18. Let’s keep in touch
Facebook: https://www.facebook.com/AhmedNMahran1
LinkedIn: https://www.linkedin.com/in/AhmedNMahran/
Twitter | Instagram| Github: @AhmedNMahran
Kotlin Egypt FB page: https://www.facebook.com/KotlinEgypt/
Kotlin Egypt on Twitter: @KotlinEgypt
Kotlin Egypt on LinkedIn: https://www.linkedin.com/company/KotlinEgypt/