I added src

src/hackingrace/AscendingHackerThread.java

+package hackingrace;
+
+public class AscendingHackerThread  extends HackerThread{
+    public AscendingHackerThread(Vault vault){
+   super(vault,"Ascending Hacker");
+    }
+    @Override
+    public void run(){
+       for(int guess=0;guess<=9999;guess++) {
+
+       if(vault.isCorrectPassword(guess)){
+           onHacked(guess);
+       }
+
+       }
+    }
+}

src/hackingrace/DescendingHackerThread.java

+package hackingrace;
+
+public class DescendingHackerThread extends HackerThread
+{
+    public DescendingHackerThread (Vault vault){
+        super(vault,"Descending Hacker");
+    }
+    @Override
+    public void run(){
+        for(int guess=10000; guess>=0;guess --)
+        {
+            if(vault.isCorrectPassword(guess)){
+                onHacked(guess);
+            }
+        }
+    }
+}

src/hackingrace/HackerThread.java

+package hackingrace;
+
+public abstract  class HackerThread extends  Thread {
+protected  final Vault vault;
+public  HackerThread(Vault vault,String name)
+{
+    super(name);
+    this.vault=vault;
+}
+
+
+
+
+@Override
+    public abstract void run();
+protected void onHacked(int password){
+    System.out.printf("*** % WINS! The vault has been hacked with password: %d ****\n",
+            this.getName(),password);
+    System.exit(0);
+}
+}
+

src/hackingrace/PoliceThread.java

+package hackingrace;
+
+public class PoliceThread extends  Thread{
+
+    public PoliceThread(){
+        super("Police");
+    }
+@Override
+public void run(){
+        for(int i = 10; i>=0;i--)
+    if (i > 0) {
+        System.out.printf("Police arrive in %d seconds...\n", i);
+    } else {
+        // عند الوصول إلى 0، تفوز الشرطة [cite: 23, 31]
+        System.out.println("\n**************************************************");
+        System.out.println("Game over for you hackers! Police have arrived.");
+        System.out.println("**************************************************");
+        // يُنهي البرنامج بالكامل [cite: 23, 57]
+        System.exit(0);
+    }
+        try{
+            Thread.sleep(1000);
+
+        } catch (InterruptedException e){
+                    return;
+        }
+
+}
+}

src/hackingrace/Vault.java

+package hackingrace;
+import  java.util.Random;
+
+
+public class Vault {
+    private final int correctpassword;
+    public Vault(){
+        this.correctpassword=new Random().nextInt(10000);
+
+
+    }
+    public boolean isCorrectPassword (int gusses)
+    {
+        try {
+            Thread.sleep(5);
+
+        }catch(InterruptedException e){
+            Thread.currentThread().interrupt();
+        }
+        return gusses==this.correctpassword;
+    }
+}

src/hackingrace/VaultHackingRace.java

+package hackingrace;
+
+public class VaultHackingRace {
+public static void main(String[] args){
+    Vault vault=new Vault();
+        Thread ascendingHacker = new AscendingHackerThread(vault);
+        Thread descendingHacker = new DescendingHackerThread(vault);
+        Thread policeThread = new PoliceThread();
+
+        // 3. يستخدم أولوية Thread.MAX_PRIORITY لنياسب القراصنة [cite: 28, 45]
+        ascendingHacker.setPriority(Thread.MAX_PRIORITY);
+        descendingHacker.setPriority(Thread.MAX_PRIORITY);
+
+        // نيسب الشرطة يعمل بالأولوية الافتراضية (عادةً NORM_PRIORITY)
+
+        // 4. يُطلق النياسب الثلاثة في نفس الوقت [cite: 27]
+        policeThread.start();
+        ascendingHacker.start();
+        descendingHacker.start();
+        System.out.println("--- Vault Hacking Race Started ---");
+        System.out.println("Two hackers are competing to find the password (0-9999).");
+        System.out.println("Police arrive in 10 seconds. Hackers have MAX_PRIORITY.");
+        System.out.println("------------------------------------");
+        // البرنامج ينتظر حتى يُنهي System.exit(0)
+    }
+
+
+}