public void actionPerformed(ActionEvent e) {
    final FindGateWaysAndIps scanner = new FindGateWaysAndIps();
    if (e.getActionCommand()=="Start Scan"){
        scanner.start();
    }
    if (e.getActionCommand()=="Stop Scan"){
                scanner.interrupt();
                scanner.stopScans();
    }
}

String ip = "192.168.";
String sql =" ";
static volatile boolean stop = false;
PingResult AllResaults = new PingResult();
int [] AllGateWays = new int [256];

final int NUM_THREADS = Runtime.getRuntime().availableProcessors();
ExecutorService exec = Executors.newFixedThreadPool(NUM_THREADS*5);

public void run() {
    stop=true;
    while(stop){
    for (;GateWayKey<=GateWayKeyStop;GateWayKey++){
        if (!stop){
            exec.shutdownNow();
            Thread.currentThread().interrupt();
            break;
        }
        ip="192.168."+GateWayKey+".1";
        AllSQLs.add(exec.submit((new PingTask(ip,GateWayKey,true))));
    }
    if (!stop) {
        exec.shutdownNow();
        Thread.currentThread().interrupt();
        break;
    }
    AllGateWays=GetVectorData.GiveMeGateWays();
    for (int j=0; j<= AllGateWays.length;j++){
        System.out.println("stop je: "+stop);
        if (!stop){
            exec.shutdownNow();
            Thread.currentThread().interrupt();
            break;
        }
        removeDuplicateinVectors();
        //System.out.println("Sada je j"+j);
        for (;SubNetKey<=SubNetKeyStop;SubNetKey++){
            if (!stop){
                exec.shutdownNow();
                Thread.currentThread().interrupt();
                break;
            }
            ip="192.168."+AllGateWays[j]+"."+SubNetKey;
            AllSQLs.add (exec.submit((new PingTask(ip,AllGateWays[j],false))));
        }

        // Process the result here (this is where you insert into the DB)
        //WriteAllDataIntoDataBase();
    }
    exec.shutdown();
    //WriteAllDataIntoDataBase();
}

public void stopScans(){
    exec.shutdownNow();
    stop=false;
}

public class PingTask implements Callable <String> {
    String ips;
    String sql;
    PingResult PassDataToExternalClass = new PingResult();
    //FindGateWaysAndIps DataProccesor = new FindGateWaysAndIps();
    int GateWay;
    ScanFrame MonitorData = new ScanFrame();
    boolean GateWayORSubNet;
    int [] AllGateWays = new int [256];
    int i=0;
    public int[] GiveMeGateWays(){
        return AllGateWays;
    }
    public PingTask (){
    }
    public PingTask (String ip, int GateWayKey, boolean GateWayORSubNets){
        ips=ip;
        GateWay=GateWayKey;
        GateWayORSubNet=GateWayORSubNets;
    }

    public String call(){
        InetAddress address;
        try {
            address = InetAddress.getByName(ips);//ako nade gateway neka skoci u petlju u kojoj nade IP adrese pripadajuceg gatewaya
            System.out.println("PINGAM: "+ips);
            try {
                if (address.isReachable(2000)) { //pinga gatewaya s 1000ms (jeli je moguce ovo smanjiti da se ubrza proces)?
                    System.out.println("Nasa sam IP: "+ips);
                    AllGateWays[i]=GateWay;
                    i++;
                        MonitorData.WriteMonitorData(ips,address.getHostName().toString(),"2000","da");

                    if (GateWayORSubNet){
                            sql="REPLACE INTO `gateways` (`ID_GATEWAY` , `GATEWAY_IP` , `GATEWAY_NAME`) VALUES ('"+GateWay+"', '"+ips+"', '"+address.getHostName().toString()+"');";
                            return sql;
                        }
                        else{
                            sql="REPLACE INTO `subnets` (`IP` , `COMPUTER_NAME` , `GATEWAY_KEY`) VALUES ('"+ips+"', '"+address.getHostName().toString()+"', '"+GateWay+"');";
                            return sql;
                        }
                    } else {
                            return ";";
                    }
                } catch (IOException e) {
                    return ";";
                }
            } catch (UnknownHostException e) {
                return ";";
            }
    }
}

while(true){
}

while(!Thread.currentThread.isInterrupted){
}
//do here what to do in order to exit and clean safely your job and used resources like open filed.

catch(InterruptedException e){
//do nothing
}

catch(InterruptedException e){
    Thread.currentThread.interrupt();
}