Thread Anti Virus

LISTING PROGRAM

class Database{

            public static synchronized void aksesDb(String objnm){

                                    try{Thread.sleep(1000);}catch(Exception e){}

                                    System.out.println("Thread "+objnm+" is running!");

            }

}

public class AntiVirus{

            public static void main(String[] args){

                        Thread update = new Thread(){

                                    public void run(){

                                                while(true){

                                                            try{Thread.currentThread().sleep(5000);}catch(Exception e){}

                                                            Database.aksesDb("update");

                                                            }

                                                }

                                    };

                        Thread scan_virus = new Thread(){

                                    public void run(){

                                                while(true){

                                                try{Thread.currentThread().sleep(3000);}catch(Exception e){}

                                                for(int i=0; i<5; i++){

                                                            Database.aksesDb("scanning for virus.....");

                                                            try{Thread.currentThread().sleep(1000);}catch(Exception e){}

                                                            }

                                                }

                                    }

                        };

                        scan_virus.start();

                        update.start();

            }

}

LOGIKA PROGRAM

class Database{

            public static synchronized void aksesDb(String objnm){

                                    try{Thread.sleep(1000);}catch(Exception e){}

                                    System.out.println("Thread "+objnm+" is running!");

            }

}

            Perintah diatas merupakan class yang diberi nama Database dimana di dalam blok prgram diatas terdapat perintah sinkronisasi dan blok try catch dengan thread sleepnya sebesar 1000 ms atau 1 sekon.

public class AntiVirus{

            public static void main(String[] args){

                        Thread update = new Thread(){

                                    public void run(){

                                                while(true){

                                                            try{Thread.currentThread().sleep(5000);}catch(Exceptione){}

                                                            Database.aksesDb("update");

                                                            }

                                                }

                                    };

            Perintah diatas merupakan fungsi utama dari program. Dalam program diatas terdapat pembuatan objek dengan nama update, kemudian akan menjalankan fungsi run. Dimana thread akan mengupdate setiap 5000 ms atau 5 sekon. 

                        Thread scan_virus = new Thread(){

                                    public void run(){

                                                while(true){

                                                try{Thread.currentThread().sleep(3000);}catch(Exception e){}

                                                for(int i=0; i<5; i++){

                                                            Database.aksesDb("scanning for virus.....");

                        try{Thread.currentThread().sleep(1000);}catch(Exceptione){}

                                                            }

                                                }

                                    }

                        };

            Perintah diatas terdapat pembuatan objek baru lagi yang diberi nama scan_virus, kemudian memanggil fungsi run. Dimana thread akan menscanning virus setiap 3000 ms atau 3 sekon. Kemudian setelah 3 sekon program akan mengupdate lagi setelah 1000 ms atau 1 sekon.          

                        scan_virus.start();

                        update.start();

            }

}

            Perintah diatas digunakan untuk menjalankan program yang telah dibuat, perintah scan_virus.start() digunakan untuk melakukan scanning virus, sedangkan perintah update.start() digunakan untuk mengupdate thread. 
OUTPUT PROGRAM