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| Language | Kotlin |
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| Owner | w3xue |
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| Modified | |
| Visibility | Public |
open class C
class D: C()
fun C.foo() = "c" // 扩展函数 foo
fun D.foo() = "d" // 扩展函数 foo
fun printFoo(c: C) {
println(c.foo()) // 类型是 C 类
}
fun main(arg:Array<String>){
printFoo(D())
}
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