"This" points to other object? Why?

[Ejeep]

I have a strange issue.When I use "This" to output the current object,
the console outputs the other object.
Who can help me analyse it?Why could it happen?
Please see the example below.
The normal output is: fh.a --this:fh@9d6
but sometimes the output is: fh.a --this:an@c10

public class fh
{
public fh(Image image)
{
a = image;
}

public void a(Graphics g1, int j, int k)
{
System.out.println("fh.a --this:"+this);
g1.drawImage(a,......);

}
private Image a;
}

 

[John B. Matthews]

I have a strange issue.When I use "This" to output the current
object, the console outputs the other object. Who can help me analyse
it? Why could it happen?
Please see the example below.
The normal output is: fh.a --this:fh@9d6
but sometimes the output is: fh.a --this:an@c10

I am unable to compile your example. How did you get the output shown?
Can you supply an SSCCE <http://pscode.org/sscce.html>? Here is mine:

<code>
import java.awt.Image;

public class fh {

private static Image a;

public fh() {
System.out.println("this: " + this);
System.out.println("a: " + a);
}

public static void main(String[] args) {
new fh();
}
}
</code>
this: fh@66848c
a: null
<console>

 

[Andreas Leitgeb]

I have a strange issue.When I use "This" to output the current object,
the console outputs the other object.
Who can help me analyse it?Why could it happen?
Please see the example below.
The normal output is: fh.a --this:fh@9d6
but sometimes the output is: fh.a --this:an@c10

You probably have two instances of that class.

One of these instances is an instance of "fh" itself, while
the other is really an instance of "an", which is probably
some subclass of "fh".

 

[Ejeep]

You probably have two instances of that class.

One of these instances is an instance of "fh" itself, while
the other is really an instance of "an", which is probably
some subclass of "fh".

Thanks for your reply.
These two classes are not relation of inheritance.

 

[Andreas Leitgeb]

Thanks for your reply.
These two classes are not relation of inheritance.

In that case, that other class "an"'s method has similar
code for logging in it, even wrongly claiming it was "fh.a".

 

[Roedy Green]

public class fh
{
public fh(Image image)
{
a = image;
}

public void a(Graphics g1, int j, int k)
{
System.out.println("fh.a --this:"+this);
g1.drawImage(a,......);

}
private Image a;
}

You problem is in the code you did not show. See
http://mindprod.com/jgloss/sscce.html

You did two things in the part you revealed to help confuse yourself
and your audience:

1. using a lower case class name.

2. use the symbol a to be both a field and a method. There are plenty
of names to go around.
--
Roedy Green Canadian Mind Products
http://mindprod.com

"Deer hunting would be fine sport, if only the deer had guns."
~ William S. Gilbert of Gilbert and Sullivan