step2

src/hacker/AscendingHackerThread.java

 package hacker;
 
-public class AscendingHackerThread {
+public class AscendingHackerThread extends Thread{
+    private Vault vault;
+
+    public static final int Max_PASSWORD = 9999;
+
+    public AscendingHackerThread(Vault vault){
+        this.vault =vault;
+        //A function that changes the name of the thread only to make it easier to track it while running
+        this.setName(this.getClass().getSimpleName());
+    }
+    public void run(){
+        for (int x=0;x<=Max_PASSWORD;x++){
+
+            if (vault.isCorrectPassword(x)){
+                System.out.println("success"+this.getName()+"the correct password"+x);
+                System.exit(0);
+            }
+        }
+    }
 }