我如何使用反射动态获取调用者实例的实例

Question

我正在Swing应用程序中工作。

public class Owner extends JPanel{ 
    Child child=null; 
    public Owner(){ 
    child=new Child(); 
    } 
} 

public class Child extends JPanel{ 
    public Child(){ 
    // Here I want the instance of Owner class. 
    // This child class is being created from many classes(almost 1000) like the Owner class. 
    } 
} 

我想要一些方法来获得调用类实例的实例，也许使用反射。 这样我可以将KeyListener关联到每个实例。 这是必需的，否则我必须在所有1000个类中编写相同的代码。

我所有的课程都在延伸JPanel，一旦组件与组件关联到父组件，我就可以从Parent属性获取父组件。但是在这里我需要它在Child的构造函数中，即组件还没有与Owner关联。

Answer 1

public class Owner extends JPanel{ 
Child child=null; 
public Owner(){ 
child=new Child(this); 
} 
} 

public class Child extends JPanel{ 
    Object owner ; 
    public Child(Object owner){ 
     this.owner = owner ; 
     // Here I want the instance of Owner class. 
     // This child class is being created from many classes(almost 1000) like the  Owner class. 
    } 
} 

Answer 2

类似的东西可以帮助你：

public class Owner extends JPanel { 
    Child child; 

    public Owner() { 
     child = new Child(this); 
    } 
} 

public class Child extends JPanel { 
    Owner owner; 

    public Child(Owner owner) { 
     this.owner = owner; 
     // add key listeners here to owner 
     owner.addKeyListener(...) 
    } 
}