Question

我正在使用Swing应用程序。

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取调用类实例的实例，也许使用反射。这样我就可以将KeyListener与每个实例相关联。这是必需的，否则我必须在所有1000个类中编写相同的代码。

我的所有类都在扩展JPanel，一旦组件与组件关联到父组，我就可以从Parent属性中获取父级。但是我在Child的构造函数中需要它，即组件尚未与Owner相关联。

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

这样的事可能会对你有所帮助：

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(...)
    }
}

如何使用反射动态获取调用者实例的实例

2 个答案: