Kotlin for Java Developers

Yuvraj Waghray

Who Am I?

https://github.com/yuvrajw

Java

  • Static Typing
  • Strong Ecosystem
  • Community
  • JVM

Java

public class Person {
    private final String first;
    private final String last;

    public Person(String first, String last) {
        this.first = first;
        this.last = last;
    }

    public String getFirst() {
        return first;
    }

    public String getLast() {
        return last;
    }

    @Override
    public String toString() {
        return "Person( first=" + first + "last=" + last + ")";
    }

    @Override
    public int hashCode() {
        return Objects.hash(first, last);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) return true;
        if (obj == null || getClass() != obj.getClass()) return false;
        Person person = (Person) obj;
        return Objects.equals(first, person.first)
                && Objects.equals(last, person.last);

    }

    public Person copy(Object obj) {
        return null;
    }
}

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

Resources

Questions?

Kotlin for JVM

By Yuvraj Waghray

Kotlin for JVM

Eonics Hacknight presentation

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