From Java to Kotlin Cheat Sheet

Fabio Santana

Last update: Dec 23, 2022

Related tags

Kotlin kotlin java

Overview

From Java to Kotlin Cheat Sheet

Page: http://fabiomsr.github.io/from-java-to-kotlin/

Programmatically inspired from swift-is-like-go and visually inspired from swiftislikescala

License

MIT

Develop

npm i # install dependencies to build tools
./make.coffee dev # build html

HTML is generated from cirru/index.cirru, cirru/functions.cirru and cirru/classes.cirru. Read those files and you would know what's happening.

Comments

Mistake in Generic Methods category

There is mistake in this category. In Java section we have method createList, but called only create. In Kotlin section there is no mistake.

Screenshot

opened by MenosGrante 2
Replace range with until function that does not include its end element

for-in-until was included in Kotlin 1.1.4 and it's offers optimizations for right-exclusive loops (ref.).

I am opening this PR to change the right-exclusive loop example in Kotlin using until instead of ranges.

opened by wesjon 1
Top navigation doesn't indicate in which section you're in

Take a look at the image below. As you can see there is no way of telling in which section you're in. Users might miss checking other sections if they don't realize these are navigation links.

My suggestion is to add a selected state, a line below the current section or a different background, to the current section.

opened by wesjon 1
remove unnecessary `internal` modifier, as it refers to a module
internal is not the same as Java's package-private. From the docs:

The internal visibility modifier means that the member is visible with the same module. More specifically, a module is a set of Kotlin files compiled together:

an IntelliJ IDEA module;

a Maven or Gradle project;

a set of files compiled with one invocation of the Ant task.
opened by lmller 1
Java 9 Collections factory methods.

This pull request simplifies the collection creation with features from Java 9 (not yet released). You can merge it whenever you feel like Java 9 is standard enough to. I hope this helps!

Thanks, Eli

opened by EtherTyper 1
A couple of issues
val name = null is of type Nothing?

The multi line string will contain a lot of whitespace if you don't call trimMargin

The when snippet is wrong. The branch isOdd(x) will never be triggered because it compares the value of the string x to the boolean result of the call. If you want to have method calls in the when branches, you need to pull the argument out of the when-expression.

The correct name for "Tuples" is "Data Classes" paired with "Destructuring". Tuples are something different.

The correct name for "Object instance" is "Constructor call"

You can leave out the body of a class if it's empty

The correct name for "Attributes" is "Primary Constructor"

A better name for "Multiple Constructors" is "Optional Arguments in Constructors (as alternative to overloaded constructors)"
opened by cypressious 1
Update null-ii.java to be consistent with kotlin

The kotlin code assigns null to length if text is null. The old java code declared length in a different scope and never declared length when text was null.

opened by stevenwaterman 0

Owner

Fabio Santana

Medium: medium.com/@xenss Twitter: twitter.com/XensS

GitHub http://fabiomsr.github.io/from-java-to-kotlin/

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