Yet Another Kotlin VS Java Comparison

This one shows complete examples where the Kotlin code is compiled to bytecode and decompiled to Java. Enabling a person familiar with Java to very quickly understand Kotlin.

Examples

The examples are organized like the examples in the Kotlin Reference.

Basics

• Control Flow
  • Assign From If
  • Assign If Not Null
  • When
• Returns Jumps
  • Loop Labels
  • Return To Label

Classes And Objects

• Classes And Inheritance
  • Empty Class
  • Constructor Param
  • Init Order Demo
  • Constructor To Attribute
  • Init From Constructor
  • Constructor With Annotation
  • Secondary Constructor
  • Default Values
  • Instantiation
  • Open Closed Data Object
  • Inheritance
  • Inheritance No Primary Constructor
  • Override Method
  • Derived Class Initialization Order
  • Inner Class
  • Overriding Rules
• Data Classes
  • Class Body And Constructor
  • Copy
  • Destructing
  • Data
• Generics
  • Out Parameter
  • In Parameter
  • Copy Out Parameter
• Nested Classes
  • Nested Class
  • Inner Class
  • Anonymous Class
• Objects
  • Object
  • Companion And Jvmstatic
• Properties
  • Properties And Fields
  • Setter With Annotation
  • Var And Val
  • Lateinit
• Sealed Classes
  • Sealed Class
  • Not Sealed

Functions And Lambdas

• Functions
  • Tail Recursive
  • Single Expression
  • Infix

Mixed

• Extensions
  • Extending Standard Library