英文:
Child class Web-elements initialized in Parent class using PageFactory.initElements
问题
当我在父类中使用PageFactory.initElements时，子类的元素也会被初始化。这是如何工作的？
public class PageBase {
public PageBase(WebDriver dr) {
this.dr = dr;
PageFactory.initElements(dr, this);
}
}
在PageBase（父类）中，'this' 是对PageBase（父类）的引用，对吗？那么为什么它会初始化下面子类中的元素呢？这是因为继承吗（即子类也会用父类初始化的内容进行初始化）？
public class LoginPage extends PageBase {
private WebDriver dr;
public LoginPage(WebDriver dr) {
super(dr);
this.dr = dr;
// PageFactory.initElements(dr, this);
}
@FindBy(how = How.ID, using = "Bugzilla_login")
WebElement weUserName;
@FindBy(id = "Bugzilla_password")
WebElement wepassword;
@FindBy(how = How.XPATH, using = "//input[@id='log_in']")
WebElement weLoginBtn;
}
英文:
When I use PageFactory.initElements in parent class, child class elements are initialized. How this is working?
public class PageBase {
public PageBase(WebDriver dr)
{
this.dr=dr;
PageFactory.initElements(dr, this);
}
}
Here in PageBase(parent), 'this' is reference of PageBase(parent) right? then how its initializing elements in below child class? is this because of inheritance[i.e something like child class also will be initialized with parent]?
public class LoginPage extends PageBase{
private WebDriver dr;
public LoginPage(WebDriver dr)
{
super(dr);
this.dr=dr;
//PageFactory.initElements(dr, this);
}
@FindBy(how=How.ID,using="Bugzilla_login")
WebElement weUserName;
@FindBy(id="Bugzilla_password")
WebElement wepassword;
@FindBy(how=How.XPATH,using="//input[@id='log_in']")
WebElement weLoginBtn;
}
答案1
得分: 0
this 是对正在创建的 PageBase 子实例的引用；this 总是指向具体的运行时类。
我们可以通过一个简单的示例来证明。
public class Main {
public static void main(String... args) {
Parent aParent = new Child("foo");
}
static class Parent {
Parent(String someArg) {
Factory.initElements(someArg, this);
}
}
static class Factory {
static void initElements(String someArg, Parent p) {
System.out.println("Parent 对象 'p' 是类的实例：" + p.getClass().getSimpleName());
}
}
static class Child extends Parent {
Child(String someArg) {
super(someArg);
}
}
}
Parent 对象 'p' 是类的实例：Child
请注意，根据您的 IDE 设置，您可能会看到 Leaking this in constructor warning（构造函数中的 this 泄漏警告）。
英文:
this is a reference to the PageBase child instance being created; this always refers to the concrete runtime class.
We can prove it with a simple example.
public class Main {
public static void main(String... args) {
Parent aParent = new Child("foo");
}
static class Parent {
Parent(String someArg) {
Factory.initElements(someArg, this);
}
}
static class Factory {
static void initElements(String someArg, Parent p) {
System.out.println( "Parent object 'p' is an instance of class: " + p.getClass().getSimpleName() );
}
}
static class Child extends Parent {
Child(String someArg) {
super(someArg);
}
}
}
> Parent object 'p' is an instance of class: Child
Note that depending on your IDE settings, you may see a Leaking this in constructor warning.
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