如何使用反射动态获取调用者实例的实例

Question

I am working in a Swing application.

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.
   }
}

I want some way to get the instance of the calling class instance, maybe using reflection. So that I can associate a KeyListener to each instance. This is required, otherwise I have to write the same codes in all the 1000 classes.

All my classes are extending JPanel , I can get the parent from the Parent property once the component is associated to the component to the parent. But here I need it inside the constructor of Child , ie the component is not associated to Owner yet.

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

Something like that may help you:

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(...)
    }
}