如何将Selenium调用到另一个类:NullPointerException

问题描述：

我们如何将对象硒校正为硒的一半代码的另一个文件.

How can we cal an object selenium to the other file which has half code of selenium.

在PHP中，我可以按照以下代码进行操作.

In PHP i can by following code.

login($ this); ----> login($ sel){.....}

我可以在Java中做同样的事情吗，因为我的硒设置位于一个文件中，而使用它的函数位于另一个文件中，当我得到NullPointerException时，我们可以将硒传递给另一个吗?
如果您需要与此相关的更多详细信息，请告诉我.

Can i do the same in Java as my selenium setup is in one file and the function which uses it is in another file can we pass the selenium to other as I am getting the NullPointerException.
Let me know if you want more details related to this.

更新

Library.java

public class Library extends SeleneseTestCase {
    public int Login() throws Exception {

        if (selenium.isElementPresent("companyID")) {
            selenium.type("companyID", "COMP");
            selenium.click("submit_logon");
            selenium.waitForPageToLoad("80000");
        }
    }
}

public class Login extends Library {

    @Before
    public void setUp() throws Exception {
        selenium = new DefaultSelenium("localhost", 4444, "*chrome", "https://businessbanking.com/");
        selenium.start();
    }

    public void testAllTests() throws Exception {
        Library obj1 = new Library();
        obj1.Login();
    }
}

根据我的观察，在登录文件上启动的硒实例未寻址到库.我试图将"selenium"作为参数传递，但失败了，在库中，我尝试了"super.setUp()"，但它也失败了.

As per my observation selenium instance started on login file is not addressed to Library. I tried to pass "selenium" as parameter but failed, in Library i tried "super.setUp()" it also failed.

谢谢.

答

替换:

public void testAllTests() throws Exception {
    Library obj1 = new Library();
    obj1.Login();
}

使用:

public void testAllTests() throws Exception {
    super.Login();
}

由于您的Login类已经扩展了Library，因此它已经具有Login()方法.您当前正在做的是创建一个不会运行 @Before 的新Library对象，因此Selenium字段未初始化(在新对象中).

Since your Login class already extends Library it already has the Login() method present in it. What you are currently doing is creating a new Library object which does not run the @Before and hence the Selenium field is not initialised (in the new object).

当子类扩展基类时，它将继承其方法.这是Java和OOP的基本概念.

When a subclass extends a base class it will inherit its methods. This is a fundamental Java and OOP concept.

如何将Selenium调用到另一个类:NullPointerException

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