我如何使用反射動態獲取調用者實例的實例

Question

我正在Swing應用程序中工作。

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. 
    } 
} 

我想要一些方法來獲得調用類實例的實例，也許使用反射。 這樣我可以將KeyListener關聯到每個實例。 這是必需的，否則我必須在所有1000個類中編寫相同的代碼。

我所有的課程都在延伸JPanel，一旦組件與組件關聯到父組件，我就可以從Parent屬性獲取父組件。但是在這裏我需要它在Child的構造函數中，即組件還沒有與Owner關聯。

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

類似的東西可以幫助你：

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(...) 
    } 
}