Kotlin for Java Developers

Yuvraj Waghray

Who Am I?

https://github.com/yuvrajw

Java

  • Static Typing
  • Strong Ecosystem
  • Community
  • JVM

Java

import java.util.Objects;

public class Customer {
    private String firstName;
    private String lastName;
    private String email;
    private String company;


    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {

        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getCompany() {
        if (company != null) {
            return  company;
        }
        return "";
    }

    public void setCompany(String company) {
        this.company = company;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Customer customer = (Customer) o;
        return Objects.equals(email, customer.email);
    }

    @Override
    public int hashCode() {

        return Objects.hash(email);
    }
}

Kotlin

What is Kotlin?

JVM
 

      Android

     
       Browser

 

    Native

Why Kotlin?

  • Concise
  • Versatile
  • Brings goodies from other languages
  • Interoperable
  • Tooling

Key Features

  • Null safe type system
  • Immutable by design
  • Type inference
  • Smart/Dynamic casts
  • String templating
  • Multiline strings
  • ....
  • Automatic properties
  • Data classes
  • if / when / for expressions
  • Functional Programming
  • Extension methods
  • No Checked Exceptions 
  • ....

Let's Dive In!

Drawbacks

  • Smaller / Growing Community
  • Fewer developers with expertise
  • Lack of support in tools like HP Fortify
  • JVM issues such as Type erasure at runtime

Resources

Questions?

Copy of deck

By Yuvraj Waghray

Copy of deck

  • 75
Loading comments...

More from Yuvraj Waghray