仿制药的使用方法 [英] Generics method usage

问题描述

我在C＃代码：

private static T GetPage<T>() where T : new()
{
    var page = new T();
    PageFactory.InitElements(Browser.Driver, page);
    return page;
}
public static AboutPage About
{
   get { return GetPage<AboutPage>(); }
}  

我试图用Java来实现这一点，因为我真的很喜欢这个概念，但我不擅长与仿制药（尤其是用C＃）。所以，这是我的代码：

I was trying to implement this in Java, as I really liked the concept, but I'm not good with generics (and especially with c#). So, that's my code:

private static <T> T getPage(Class<? extends T> cls) throws Exception{
    T page = cls.newInstance();
    PageFactory.initElements(driver, page);
    return page;
}
public static LoginPage Login() {
    return LoginPage.getPage();
}  

这是不工作的。我觉得我失去了基本面，所以我真的很感激任何帮助或建议

It's not working at all. I feel like I'm missing fundamentals, so I'd really appreciate any help or advice.

推荐答案

试试这个：

private static <T> T getPage(Supplier<? extends T> supp) {
    T page = supp.get();
    PageFactory.initElements(driver, page);
    return page;
}

public static LoginPage Login() {
    return getPage(LoginPage::new); // Passing the default constructor
}

下面我转出的实例 T 从类，从供应商实例，因为它没有。抛出异常

Here I switch out the instantiation of T from Class, to instantiation from a Supplier, since it does not throw exceptions.

如果您没有安装Java 8，你必须使用你的代码，调用，如：

If you don't have Java 8, you would have to use your code, and call like:

getPage(LoginPage.class);

但是，这也意味着不必处理的异常。

But that would also mean having to deal with the exceptions.

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