JLabels with MouseListener
my teacher gave us an assignment to do
he gives us what he calls "starter code" and makes us use his starter code
in our own code. sounds good? the thing is one of the lines he has does not
make sense to me.
in a method that is in a class that extends mouseadapter
mouseClicked
the first line of code he has is
JLabel label = (JLabel) e.getComponent();
um... im assuming that if my code of
String x = label.getText();
would give me the string that is on the JLabel
however, i get an error instead
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException
and since i am not aloud to change his code,
i am forced to learn a way to go about getting the contents of a JLabel when i click it using his starter code.
Re: I posted this on the New to Java Technology forum and got one
response from walken16 (thank you by the way). His reply went something like this:
just suppose that the variable "e" is one of these
mouse event //which is a correct assumption
you will find it's methods in the previous link.
here is the doc for JLabel
JLabel
you won't have any luck casting an event to one of these
sincerely
Walken
So... im thinking to myself.. ive been trying for 2 days now and I cannot figure this thing out? Is there a way to make this bad cast work? If this is impossible, please let me know so I can stop wasting my time trying and spend my time giving my teacher hell for this torture.
Thanks
> Is there
> a way to make this bad cast work?
NO, no way to make a bad cast work
If this is
> impossible, please let me know so I can stop wasting
> my time trying and spend my time giving my teacher
> hell for this torture.
> Thanks
just go ahead and post all of the code your teacher gave to you.
walken16
here you go, hope this helps
at least it might give you something to ask questions about.
the reason you didn't get better response was due to some vagueness on your part.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.border.LineBorder;
public class LabelTest {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel label = new JLabel("apple_ipod");
label.setBorder(new LineBorder(Color.BLACK));
frame.getContentPane().setLayout(new FlowLayout());
frame.getContentPane().add(label);
frame.pack();
frame.setLocationRelativeTo(null);
MouseListener listener = new MouseAdapter(){
public void mouseClicked(MouseEvent me){
Object obj = me.getSource();
JLabel myLabel = (JLabel)obj;
System.out.println("event from label: "+myLabel.getText());
}
};
label.addMouseListener(listener);
frame.show();
}
}
and the response you mentioned was on this thread
[url]http://forum.java.sun.com/thread.jspa?threadID=688283[/url]
and you only waited 15 minutes.
I realize that you are frustrated and i'll try to help but you need to slow
down when you post and give us some more info.
It doesn't appear that your instructors code will work but we don't know.
best option is to change it as required and you'll be the only one that gets it to work.
that is if you are graded on actually completing and running the code
and not just turning in code on a peice of paper.
sincerely
Walken16
