Comparison to Java
Some Java issues addressed in Kotlin
Kotlin fixes a series of issues that Java suffers from:
Null references are controlled by the type system.
Arrays in Kotlin are invariant
Kotlin has proper function types, as opposed to Java's SAM-conversions
Use-site variance without wildcards
Kotlin does not have checked exceptions
What Java has that Kotlin does not
Primitive types that are not classes. The byte-code uses primitives where possible, but they are not explicitly available.
Static members are replaced with companion objects, top-level functions, extension functions, or @JvmStatic.
Wildcard-types are replaced with declaration-site variance and type projections.
a ? b : cis replaced with if expression.
What Kotlin has that Java does not
Lambda expressions + Inline functions = performant custom control structures
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Last modified: 02 June 2023