File constructor and TimerTask

Question

Hello.
I have two questions.
One is I need to create a file with the name of an image.
For example I have an image in the path classes/Ventanas/router.png.
This path is created when the classes are compiled.
I did the same in other class with the path
ImageIcon icononodo = new ImageIcon(Ventanas.PantallaRedJGraph.class.getResource("router.png"))
But when I try to do it whit File it doesn�t work.
File f = new File(Ventanas.PantallaRedJGraph.class.getResource("router.png").getFile());
Does anybody know anything about it?
And the other question is I have a class that extends Timer.
Inside this class I have a TimerTask
public class Sondear extends Timer{
String ipasondear;
public ConectorInterfaz conector = ConectorInterfaz.getInstancia();
final Runnable sondeo = new Runnable(){
     public void run(){
     //The code     
     }//run
};//sondeo
TimerTask repetirsondeo = new TimerTask(){
     public void run(){
     EventQueue.invokeLater(sondeo);
     }//run
};//repetirsondeo
public void sondeando(String ip){
     this.ipasondear = ip;
this.schedule(repetirsondeo, 0, 45000);
}//sondeando
I call this class from another class with the instruction.
for( //all the IP adresses){
Sondear s = new Sondear();
s.sondeando(//The ip);
My question is how can I stop this TimerTask for a period of time and call another time this class to pass another IP adresses?
I will be very grateful if somebody helps me.
Thank you very much and sorry for my english.

Answer 1

paulcw wrote: > Probably the file doesn't exist, at least not in the way you think it does and/or with the name you get from URL.getFile().
Why are you doing it that way? Is the file a jar file? If so you should use getResourceAsStream (and no File objects at all).
Also you should provide more details. What do you mean "it doesn't work"? Do you get an exception? If so you should post it with your question.
>>
Perhaps I didn`t explain it well. SorryI don�t get an exception. The image in my application doesn�t appear.
At first I have all .java files in a directory called src. And I have another directory with all my images.
When I execute the application I send the .class files to a directory called classes and the images to a directory called Ventanas.
I don�t know exactly how it is used the instruction
new ImageIcon(Ventanas.PantallaRedJGraph.class.getResource("imagename"));But in a previous application it works, so the image appears in the application.
You told me that how I did it this way.
I don�t know a lot about programming, so if there is a better way to do this with a File I will be very grateful if you say it to me.
paulcw wrote: > That seems unnecessary. Just instantiate a Timer and use it.
Your code in general seems unnecessarily complicated.
I'd suggest canceling that task, and then scheduling a new one later if you need it to run again. If the task contains state that needs to be preserved across the times that it runs, then put that state in a different object and pass that object to multiple TimerTask wrappers.
>
I have an application that sends ping to another computers and routers to see if there are connected to the network.
When the user press a button to scan the network, the application begins to look for devices and when it draws the devices connected I need that it begins to sends the ping instructions.
When the Scan button is pressed I don�t know if it is the first time the user press it or not.
What I want is that when the application is scanning the network I need to stop the Timer and restart it when the network is scanned. I need to stop all the Timers I send for all the IP addresses.
I also think that my code is a bit complicated but I don�t know another way to do it.
How can I see if an instance of this class is created?
I have a trouble in my mind.
I hope this time my explanation has been easy to understand. My English is a bit poor .
Thank you, thank you very much.