" + methodWithAllArguments(house="Stark", surname="John", name="Snow")) } fun methodWithAllArguments(surname: String, name: String = "Snow", house: String = "Stark"): String { return "$surname $name of house $house" } java -jar demo.jar Bend the knee John Snow of house Stark
" + methodWithAllArguments(surname="John")) } fun methodWithAllArguments(surname: String, name: String = "Snow", house: String = "Stark"): String { return "$surname $name of house $house" } java -jar demo.jar Bend the knee John Snow of house Stark
" + boast(null)) } fun boast(count:Int): String = "$count dragons" main.kt:4:31: error: null can not be a value of a non-null type kotlin.Int println("I have " + boast(null))
val house:String ) fun main(args: Array<String>) { var john = Person("John","Snow","Stark") greet(john) } fun greet(person:Person){ println("Welcome ${person.surname} ${person.name} of house ${person.house}") } java -jar demo.jar Welcome John Snow of house Stark
val house:String ) fun main(args: Array<String>) { var john = Person("John","Snow","Stark") greet(john) } fun greet(person:Person){ println("Welcome ${person.surname} ${person.name} of house ${person.house}") } java -jar demo.jar Welcome John Snow of house Stark
val house:String ) fun main(args: Array<String>) { var john = Person("John","Snow","Stark") greet(john) } fun greet(person:Person){ println("Welcome ${person.surname} ${person.name} of house ${person.house}") } java -jar demo.jar Welcome John Snow of house Stark
val house:String ) fun main(args: Array<String>) { var gendry = Person("Gendry") greet(gendry) } fun greet(person:Person){ println("Welcome ${person.surname} ${person.name} of house ${person.house}") } main.kt:9:33: error: no value passed for parameter name, house var gendry = Person("Gendry")
val name:String? = null, val house:String? = null ) fun main(args: Array<String>) { var john = Person("John",name="Snow", house="Stark") var gendry = Person("Gendry",house="Baratheon") var arya = Person() greet(john) greet(gendry) greet(arya) } fun greet(person:Person){ when(person.surname){ null println("Welcome servant of The Many-Faced God") else when(person.house){ null println("Welcome ${person?.surname} ${person?.name ?:""}") else println("Welcome ${person?.surname} ${person?.name ?:""} of house ${person.house}") } } } java -jar demo.jar Welcome John Snow of house Stark Welcome Gendry of house Baratheon Welcome servant of The Many-Faced God
public class PeopleCollections { public static void sortByHouse(List<Person> list) { Collections.sort(list, new Comparator<Person>() { public int compare(Person s1, Person s2) { if (s1.getHouse() == null){ return 0; } if ((s1.getHouse().equals("Lannister"))) { return -1; package org.westeros; import com.sun.istack.internal.Nullable; public class Person { private String name; private String surname; private String house; public Person(){} public Person(@Nullable String surname, @Nullable String name, @Nullable String house){ setSurname(surname); COLLECTIONS java -jar demo.jar Welcome Gendry of house Baratheon Welcome John Snow of house Stark Welcome servant of The Many-Faced God package org.westeros; import java.util.ArrayList; import org.westeros.utils.PeopleCollections; public class Main { public static void main(String[] args) { ArrayList<Person> people = new ArrayList<>(); people.add(new Person("John","Snow","Stark")); people.add(new Person("Gendry",null,"Baratheon")); people.add(new Person()); PeopleCollections.sortByHouse(people);
null println("Welcome servant of The Many-Faced God") else when(person.house){ null println("Welcome ${person?.surname} ${person?.name ?:""}") else println("Welcome ${person?.surname} ${person?.name ?:""} of house ${person.house}") } } is Ironborn println("Let ${person.surname} ${person.name } your servant be born again from the sea, as you were. Bless him with salt, bless him with stone, bless him with steel.") is Freefolk println("Welcome ${person.surname}") is Dothraki println("Athchomar Chomakea ${person.surname} ${person.name}") is Dornish println("Greetings ${person.surname} ${person.name}, $ {person.nickname}") is Valyrian println("Greetings ${person.surname} ${person.name}, $ {person.nickname}")
Andal(bastard = true,surname = "John",name="Snow", house="Stark"), Andal("Gendry",house="Baratheon",bastard = true), Andal(), // Arya in disguise Ironborn("Balon","Greyjoy"), Freefolk("Ygritte"), Dothraki("Kahl","Drogo"), Dornish(surname="Oberyn",name="Martell",nickname= "Red Viper of Dorne"), Valyrian("Daenerys","Targaryen", nickname = "the First of Her Name, The Unburnt, Queen of the Andals," + " the Rhoynar and the First Men, Queen of Meereen," + " Khaleesi of the Great Grass Sea, Protector of the Realm," + " Lady Regnant of the Seven Kingdoms, Breaker of Chains and Mother of Dragons") ) people.greet() }
Andal(bastard = true,surname = "John",name="Snow", house="Stark"), Andal("Gendry",house="Baratheon",bastard = true), Andal(), // Arya in disguise Ironborn("Balon","Greyjoy"), Freefolk("Ygritte"), Dothraki("Kahl","Drogo"), Dornish(surname="Oberyn",name="Martell",nickname= "Red Viper of Dorne"), Valyrian("Daenerys","Targaryen", nickname = "the First of Her Name, The Unburnt, Queen of the Andals," + " the Rhoynar and the First Men, Queen of Meereen," + " Khaleesi of the Great Grass Sea, Protector of the Realm," + " Lady Regnant of the Seven Kingdoms, Breaker of Chains and Mother of Dragons") ) people.greet() }
Andal(bastard = true,surname = "John",name="Snow", house="Stark"), Andal("Gendry",house="Baratheon",bastard = true), Andal(), // Arya in disguise Ironborn("Balon","Greyjoy"), Freefolk("Ygritte"), Dothraki("Kahl","Drogo"), Dornish(surname="Oberyn",name="Martell",nickname= "Red Viper of Dorne"), Valyrian("Daenerys","Targaryen", nickname = "the First of Her Name, The Unburnt, Queen of the Andals," + " the Rhoynar and the First Men, Queen of Meereen," + " Khaleesi of the Great Grass Sea, Protector of the Realm," + " Lady Regnant of the Seven Kingdoms, Breaker of Chains and Mother of Dragons”), NotAHuman ) people.greet() }
The Unburnt, Queen of the Andals, the Rhoynar and the First Men, Queen of Meereen, Khaleesi of the Great Grass Sea, Protector of the Realm, Lady Regnant of the Seven Kingdoms, Breaker of Chains and Mother of Dragons Greetings Oberyn Martell, Red Viper of Dorne Let Balon Greyjoy your servant be born again from the sea, as you were. Bless him with salt, bless him with stone, bless him with steel. Welcome Gendry of house Baratheon Welcome John Snow of house Stark Welcome servant of The Many-Faced God Welcome Ygritte Athchomar Chomakea Kahl Drogo HOLD THE DOOR! HOLD THE DOOR! HOOODOOOR! HOOODOOOOR!
val name = "Sprotch" fun wave() = "Hello, my name is $name" } } (…) println(Apple().color) // red print(Apple.Worm().wave()) // Hello, my name is Sprotch print(Apple.Worm().name) // Sprotch
val name = "Sprotch" fun wave() = "Hello, my name is $name" fun fact() = "The apple is $color" } } (…) println(Apple().color) // red print(Apple.Worm().wave()) // Hello, my name is Sprotch print(Apple.Worm().name) // Sprotch print(Apple.Worm().fact())
Worm{ val name = "Sprotch" fun wave() = "Hello, my name is $name" fun fact() = "The apple is $color" } } (…) println(Apple().color) // red print(Apple.Worm().wave()) // Hello, my name is Sprotch print(Apple.Worm().name) // Sprotch print(Apple.Worm().fact()) // The apple is red
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![fun main(args: Array<String>) = println("Bend the knee " + args[0])](https://files.speakerdeck.com/presentations/6ba6cafb54d5450292f3cf762bafe337/slide_9.jpg){kind=link}
