22 lines
716 B
Kotlin
22 lines
716 B
Kotlin
// version 1.1.2
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open class Animal(val name: String, var age: Int) {
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open fun copy() = Animal(name, age)
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override fun toString() = "Name: $name, Age: $age"
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}
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class Dog(name: String, age: Int, val breed: String) : Animal(name, age) {
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override fun copy() = Dog(name, age, breed)
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override fun toString() = super.toString() + ", Breed: $breed"
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}
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fun main(args: Array<String>) {
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val a: Animal = Dog("Rover", 3, "Terrier")
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val b: Animal = a.copy() // calls Dog.copy() because runtime type of 'a' is Dog
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println("Dog 'a' = $a") // implicitly calls Dog.toString()
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println("Dog 'b' = $b") // ditto
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println("Dog 'a' is ${if (a === b) "" else "not"} the same object as Dog 'b'")
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}
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