add README

HomeWork/Main.java

+import java.util.Random;
+
+class VaultHackingRace {
+
+    static class Vault {
+        private final int password;
+
+        public Vault() {
+            this.password = new Random().nextInt(10000);
+            System.out.println("Vault created with password: " + this.password);
+        }
+
+        public boolean isCorrectPassword(int guess) {
+            try {
+                Thread.sleep(5);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+            return guess == this.password;
+        }
+    }
+
+    abstract static class HackerThread extends Thread {
+        protected Vault vault;
+
+        public HackerThread(Vault vault) {
+            this.vault = vault;
+            this.setName(this.getClass().getSimpleName());
+            this.setPriority(Thread.MAX_PRIORITY);
+        }
+
+        @Override
+        public void start() {
+            System.out.println(this.getName() + " started working");
+            super.start();
+        }
+    }
+
+    static class AscendingHackerThread extends HackerThread {
+        public AscendingHackerThread(Vault vault) {
+            super(vault);
+        }
+
+        @Override
+        public void run() {
+            for (int guess = 0; guess <= 9999; guess++) {
+                if (vault.isCorrectPassword(guess)) {
+                    System.out.println(this.getName() + " won with password: " + guess);
+                    System.exit(0);
+                }
+            }
+        }
+    }
+
+    static class DescendingHackerThread extends HackerThread {
+        public DescendingHackerThread(Vault vault) {
+            super(vault);
+        }
+
+        @Override
+        public void run() {
+            for (int guess = 9999; guess >= 0; guess--) {
+                if (vault.isCorrectPassword(guess)) {
+                    System.out.println(this.getName() + " won with password: " + guess);
+                    System.exit(0);
+                }
+            }
+        }
+    }
+
+    static class PoliceThread extends Thread {
+        @Override
+        public void run() {
+            for (int i = 10; i > 0; i--) {
+                try {
+                    Thread.sleep(1000);
+                    System.out.println("Time remaining: " + i + " seconds");
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                }
+            }
+            System.out.println("Game over for you hackers!");
+            System.exit(0);
+        }
+    }
+
+    public static void main(String[] args) {
+        Vault vault = new Vault();
+
+        AscendingHackerThread ascendingHacker = new AscendingHackerThread(vault);
+        DescendingHackerThread descendingHacker = new DescendingHackerThread(vault);
+        PoliceThread police = new PoliceThread();
+
+        ascendingHacker.start();
+        descendingHacker.start();
+        police.start();
+    }
+}
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