Get class name of instantiating class

[nmb3000]

Java 1.5

I'm not sure if this is possible, but I'd like to get the class name of the class that instantiated my class. For example:

public class Foo {
  public static void main(String args[]) {
    Bar b = new Bar();
  }
}

...

public class Bar {
  public Bar() {
    System.out.println(parent.class.getName());
  }
}

Would output the name of Foo's class. Is that possible?

Thanks!

[r035198x]

Java 1.5

I'm not sure if this is possible, but I'd like to get the class name of the class that instantiated my class. For example:

public class Foo {
public static void main(String args[]) {
Bar b = new Bar();
}
}
 
...
 
public class Bar {
public Bar() {
System.out.println(parent.class.getName());
}
}

Would output the name of Foo's class. Is that possible?

Thanks!

If Foo f = new Foo();

then

f.getClass()

prints class Foo

[nmb3000]

Sorry, perhaps I wasn't very clear.

Foo in this case is a class I have no control over. I am writing Bar, and it will be instantiated as an object in Foo. I would like to know if there is a way that, from within Bar, I can find out what Foo's class name is.

Thanks again.

[r035198x]

Sorry, perhaps I wasn't very clear.

Foo in this case is a class I have no control over. I am writing Bar, and it will be instantiated as an object in Foo. I would like to know if there is a way that, from within Bar, I can find out what Foo's class name is.

Thanks again.

You can't. Why do you want to do it anyway?

You cannot write a class and restrict where that class will be instantiated. If you write Bar, fine. Whether Bar will be instantiated in Foo or somewhere else cannot be hardcoded into the class Bar.

[nmb3000]

You can't. Why do you want to do it anyway?

You cannot write a class and restrict where that class will be instantiated. If you write Bar, fine. Whether Bar will be instantiated in Foo or somewhere else cannot be hardcoded into the class Bar.

Hmm, it seems we're just not connecting here.

I don't care what classes instantiate my class. What I want to do is from within *my* class, get the name of whatever class it was instantiated *from*.

So say I wrote Bar. You have a program named Bob. You instantiate Bar from within Bob. I want Bar to discover that your class is named Bob.

Is this possible? Thanks again.

[r035198x]

Hmm, it seems we're just not connecting here.

Pity

I don't care what classes instantiate my class. What I want to do is from within *my* class, get the name of whatever class it was instantiated *from*.

Classes do not instantiate other classes

I want Bar to discover that your class is named Bob.

Bar can only do that inside Bob by making notorious use of an interface. You force all classes that are going to instantiate your class(Bar) to implement the InstanitiatesBa r interface

Kids, do not try this at home.

 interface InstantiatesBar { 
}
class Bar {
 InstantiatesBar object;
   Bar(InstantiatesBar object) { //constructor requires an InstantiatesBar object
  this.object = object;

   }
}
class Bob implements InstantiatesBar {
	   Bob() {
		  Bar bar = new Bar(this);
		  System.out.println(bar.object.getClass());
	   }
	   public static void main(String ... args) {
	 new Bob();
	}
}

Running that should print class Bob

There is a huge flaw in that code
Say some one writes another class

 class Lier implements InstantiatesBar { 
	   Lier() {
		  Bob bob = new Bob();
		  Bar bar = new Bar(bob);
		  System.out.println(bar.object.getClass());
	   }
	   public static void main(String ... args) {
	 new Lier();
	}

and you can guess the output to that.