Andrey Breslav
49 lines
2.0 KiB
Plaintext
49 lines
2.0 KiB
Plaintext
This document provides a quick comparison of [Kotlin] to *Java*.
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h3. Fixes
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Safety problems in *Java* that are fixed in [Kotlin]:
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* Null references are controlled by the type system, i.e. [Kotlin] has [no {{NPE}}'s|Null-safety]
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* Full type information is [retained at runtime|Generics#Reified generics], i.e. better reflection/safer instanceof-checks
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* [No raw types|Java interoperability#Java generics in Up]
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* Arrays in [Kotlin] are [invariant|Basic types#Arrays]
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Usability problems in *Java* that are fixed in [Kotlin]:
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* [Kotlin] has [higher-order functions|Functions#Higher-order functions], aka closures
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** And with [inlining|Functions#Inline functions] they are cheap
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* [Use-site variance without wildcards|Generics#Type projections]
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* [Declaration-site variance|Generics#Declaration-site variance]
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* [Kotlin] has [no checked exceptions|Exceptions]
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h3. What Java has and [Kotlin] has not
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* [Checked exceptions|Exceptions]
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* [Primitive types|Basic types] that are not objects
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* [Static members|Classes and Inheritance#Class objects]
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* [Non-private fields|Properties And Fields]
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* [Type erasure|Java interoperability#Java generics in Up]
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* [Wildcard-types|Generics#Variance]
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h3. What [Kotlin] has and Java has not
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* [Function literals] + [Inline functions|Functions#Inline functions] = performant custom control structures
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* [Null-safety]
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* [Smart casts|Type casts]
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* [String templates|Strings#Templates]
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* [Properties|Properties And Fields]
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* [Primary constructors|Classes and Inheritance#Primary constructors]
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* [Mixins and First-class delegation|Classes and Inheritance#Inheritance]
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* [Extension functions]
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* [Type inference for variable and property types|Basic syntax walk-through#Define a local variable]
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* [Singletons|Object expressions and Declarations]
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* [Declaration-site variance & Type projections|Generics#Variance]
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* [Modules|Modules and Compilation]
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* [Range expressions|Ranges]
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* [Pattern matching]
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* [Generic types retained at runtime|Generics#Reified generics]
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* [Operator overloading]
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* [Class objects|Generics#Class objects]
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h3. What's next
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* [Comparison to Scala] |