Multithreading and ArrayList

Hello,
I applied a small network or I find myself with a large quantity of objects. I made after a ping I find myself with about 1,000 IP addresses that are objects and that I would put in a collection but which one? Knowing that soon (not now I don t have time) I want to make multithreaded I think this is of use preferable Hashtable because I've started but with Vector, but it seems inadvisable because old and overused. I want to use multithreading with ArrayList, is this possible to do. If you have any solution for this, then please help me. I am interested in this.

Hello,
A Map (as Hashtable) is used to quickly access an object accurate a collection. If this is not your need, an ArrayList is sufficient. You will be able to synchronize with multithreading Collections.synchronizedList (..). I think you should go with this and I think you do not need multitasking for this. Still, if you use it, it is going to be tough for you to code for that.

Hello,
This is my code, see it and if you find any problems in it then correct me and guide me to the correct code.

Code:

---

Public void lancerScan(){
                String str = null;
               
                        try
                                {
                                str = "Executable\\test.exe "+???????+"H-Temp\\Ping.txt ";



Runtime rntm = isp.getRuntime();
Process = isp launch.exec(str);/ / start of command
                                        launch.waitfor();/ / wait for the command is //finished to start another
                                       
               
                                }
                       
                        catch(Exception e)
                                {
                                        System.out.System.out.println("rntm error" + Cmd[i] + E.function toString() {
    [native code]
}());
                                }

---

Hello,
I have modified your code, just go through it and then see if it works, for me it works here, but your needs may be different.

Code:

---

Public void uneMéthodeAppelante(){
  List lp = ....;
 .......

  for(int i =0; I <lp.size(); i + +)
  {
    lancerScan(lp.get(i));
  }
 
}
 
Public void lancerScan(String ip){
    String str = null;
    try
        {
        str = "Executable\\test.exe "ip + +"H-Temp\\Ping.txt ";
    Runtime runtime = isp.getRuntime();
Process = isp launch.exec(str);/ / start of command
        launch.waitfor();/ / wait for the command is finished to start another                                               
        }
    catch(Exception e)
        {
        System.out.System.out.println("runtime error" + Cmd[i] + E.function toString() {
    [native code]
}());
        }
}

---

Hello,
I did it like this to start the method and it works perfectly

Code:

---

{for(String e: ipls)
        ip.lancerScan(e);
}

---

I am now trying to do the same thing by sending two things just like below but it does not work.

Code:

---

{for(String e: ipList, String f: getNameNetworks())
        ip.lancerScan(e, f);
}

---

If you know thank you very much knowing getNameNetworks returns a list
I continue my tests.

Hello,
I think using the following code you can get good performance by your code. Just have a look at it.
Here is the code

Code:

---


{
  for( Strinf f: getNameNetworks() )
  {
    for(String e: ipList)
    {
      ip.lancerScan(e, f);
    }
  }
}

---

By using the following code I think you can get a better performance from your program , I mean to say that your code will work much faster.