get mouse x and y coords from method new object listener call

what's non trivila here is ,IMO that I would need to get the coordinates out of the following construction:

Code:

---

frame.addMouseListener(new MouseAdapter() {
                        public void mouseClicked(MouseEvent e) {e.getX(); e.getY();}
                });

---

the compilers allow only the following

Code:

---

final int a;
final int b;
frame.addMouseListener(new MouseAdapter() {
                        public void mouseClicked(MouseEvent e) {a=e.getX(); b=e.getY();}
                });

---

but then I cannot reference to them later as they are being errored out by the compiler as not initialized. If I try to assign values in the declaration, the compiler doesn't allow that either...

Can you explain what you trying to achieve and where you need to use the x, y co-ordinates?

If you declare a and b 'final' you can't assign values to them unless you do it in the declaration or in a constructor.

To answer your question, we need to know the answer to Keang's question.

All truths are easy to understand once they are discovered; the point is to discover them...
G. Galilie

Quote:

---

Originally Posted by EVS

what's non trivila here is ,IMO that I would need to get the coordinates out of the following construction:

Code:

---

frame.addMouseListener(new MouseAdapter() {
                        public void mouseClicked(MouseEvent e) {e.getX(); e.getY();}
                });

---

the compilers allow only the following

Code:

---

final int a;
final int b;
frame.addMouseListener(new MouseAdapter() {
                        public void mouseClicked(MouseEvent e) {a=e.getX(); b=e.getY();}
                });

---

but then I cannot reference to them later as they are being errored out by the compiler as not initialized. If I try to assign values in the declaration, the compiler doesn't allow that either...

---

Declaration of listener is in separate place from its implementation. You are trying to put both together.
It goes like this:

Code:

---


//somewhere in constructor
jPanelA.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jPanelAMouseClicked(evt);
            }
        });

//somewhere in class
private void jPanelAMouseClicked(java.awt.event.MouseEvent evt) {
       
    int x= evt.getX();
    int y= evt.getY();

    }

---

If you decide to use NetBeans IDE, it will do this automatically for you.

Quote:

---

Originally Posted by postmortem

//somewhere in constructor
jPanelA.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jPanelAMouseClicked(evt);
}
});

//somewhere in class
private void jPanelAMouseClicked(java.awt.event.MouseEvent evt) {

int x= evt.getX();
int y= evt.getY();

}

---

Err how does this help? The OP already has access to the x,y co-ordinates within the listener object's called method, extracting the code to another method makes no difference - it's just a different style.

Quote:

---

Originally Posted by dlorde

If you declare a and b 'final' you can't assign values to them unless you do it in the declaration or in a constructor.

---

Or in a static block. It looks like he might be trying to do the following, but in a method.

final int x;
final int y;

static
{
x = //mouse w/e
y = //mouse w/e
}

Quote:

---

Originally Posted by ProgramThis

Or in a static block.

---

Yes - although he'd have to declare them static:

Code:

---

static final int x;
static final int y;

static
{
    x = //mouse w/e
    y = //mouse w/e
}

---

And, of course, it can't be done in a method.

If you lie to the compiler, it will get its revenge...
Henry Spencer