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I trying to decide between Kotlin and Java 21. Please suggest me the advantages of Kotlin over Java 21.

• fzeindl 3y ago
  Kotlin all the time, for these reasons: * Nullsafe typing. * Nullsafe typing! * Inline extension functions for existing APIs. These are supremely useful. You can write features like locking and unlocking around a block, or try-with-resources in a one-liner, without compromising performance. * (Nested) When statements, if-else as expression etc. * Reified generics. You can actually write: "if (xy is T)" or use T::class * Nullsafe typing * Data classes * Getter/Setter syntax as property and indexing syntax. * Only unchecked exceptions Kotlin really is Java 2.0.
• p2detar 3y ago
  If Android, then Kotlin, else Java. But on a serious note it’s far too complex of a decision that includes your personal situation. I have a mixed codebase of Java and Kotlin and I tend to prefer Java now. I do use Kotlin’s Data classes a lot though. That’s my favorite feauture of the language.
  • kaba0 3y ago
    How do they relate to Java’s records?
    • p2detar 3y ago
      They do have similarities, but data classes actually predate records. One can declare a data class a record by using the @JvmRecord annotation, which probably introduces some JVM benefits in how records are represented in the Java memory model. All in all you could use a Kotlin data class just like you'd use a Java record, but it gives you much more flexibility like inheritance and mutable fields.