無法編譯爲什麼下面沒有在斯卡拉編譯: class A
class B
object X {
def f[Q <: A](q: Q): Q = q
def f[Q <: B](q: Q): Q = q
}
與錯誤信息 <console>:16: error: method f is defined twice
conflicting symbols both
我們導入了一個過時的項目,它促使我們將其轉換爲Swift 3.作爲對Swift不太瞭解的個人,我們在修復錯誤時遇到困難。 Error can be found at this image import Foundation
class CellDescriptorHelper {
let itemKey = "Items"
let isExpandableKey = "isExpanda
假設我有一個通用的容器類型這樣的: public final class Container<T> {
public final T t;
public Container(final T t) {
this.t = t;
}
}
我想要實現等於使得該通行證: final Container<Object> a = new Container<>
(弗林克1.3) 我與類型的提取問題: The return type of function '...' could not be determined
automatically, due to type erasure. You can give type information hints
by using the returns(...) method on the result o