Analysis of information sources in references of the Wikipedia article "Kotlin (programming language)" in English language version.
By default, the Object class defines both the .equals() and .hashCode() methods. As a result, every Java class implicitly has these two methods. [...] The default implementation of equals() in the Object class compares the identity of the object. [...] The second criterion of the .hashCode() contract has an important consequence: If we override equals(), we must also override hashCode(). [...] We would expect myTeamLeader to return "Anne," but with the current code, it doesn't. If we want to use instances of the Team class as HashMap keys, we have to override the hashCode() method so that it adheres to the contract; equal objects return the same hashCode.
we expect Kotlin to drive the sales of IntelliJ IDEA
Today, at the Google I/O keynote, the Android team announced first-class support for Kotlin.
Kotlin lets you choose the version of JVM for execution. By default, the Kotlin/JVM compiler produces Java 8 compatible bytecode. If you want to make use of optimizations available in newer versions of Java, you can explicitly specify the target Java version from 9 to 19. Note that in this case the resulting bytecode might not run on lower versions.
Working on all platforms is an explicit goal for Kotlin, but we see it as a premise to a much more important goal: sharing code between platforms. With support for JVM, Android, JavaScript, iOS, Linux, Windows, Mac and even embedded systems like STM32, Kotlin can handle any and all components of a modern application.
In 1.4.0, we slightly change the Swift API generated from Kotlin with respect to the way exceptions are translated.
Implement the full semantics of Eiffel DbC and improve upon it.
As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java™ programming language.)
This implementation provides constant-time performance for the basic operations (get and put), assuming the hash function disperses the elements properly among the buckets.
Kotlin lets you choose the version of JVM for execution. By default, the Kotlin/JVM compiler produces Java 8 compatible bytecode. If you want to make use of optimizations available in newer versions of Java, you can explicitly specify the target Java version from 9 to 19. Note that in this case the resulting bytecode might not run on lower versions.
we expect Kotlin to drive the sales of IntelliJ IDEA
Today, at the Google I/O keynote, the Android team announced first-class support for Kotlin.
Working on all platforms is an explicit goal for Kotlin, but we see it as a premise to a much more important goal: sharing code between platforms. With support for JVM, Android, JavaScript, iOS, Linux, Windows, Mac and even embedded systems like STM32, Kotlin can handle any and all components of a modern application.
In 1.4.0, we slightly change the Swift API generated from Kotlin with respect to the way exceptions are translated.
Implement the full semantics of Eiffel DbC and improve upon it.
By default, the Object class defines both the .equals() and .hashCode() methods. As a result, every Java class implicitly has these two methods. [...] The default implementation of equals() in the Object class compares the identity of the object. [...] The second criterion of the .hashCode() contract has an important consequence: If we override equals(), we must also override hashCode(). [...] We would expect myTeamLeader to return "Anne," but with the current code, it doesn't. If we want to use instances of the Team class as HashMap keys, we have to override the hashCode() method so that it adheres to the contract; equal objects return the same hashCode.
As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java™ programming language.)
This implementation provides constant-time performance for the basic operations (get and put), assuming the hash function disperses the elements properly among the buckets.
