src/main/java/DownloadWorker.java

@@ -1,5 +1,7 @@
 import java.util.Random;
 
+import static java.lang.Thread.sleep;
+
 /**
  * Simulates downloading a single chunk of a file.
  *
@@ -22,22 +24,38 @@ public class DownloadWorker implements Runnable {
     @Override
     public void run() {
         // TODO: Record the chunk start time in chunkStatus.
+        chunkStatus.setStartTimeMs(System.currentTimeMillis());
         double downloaded = 0.0;
 
         // TODO: Print a message that this chunk has started downloading.
+        System.out.println(chunkStatus.getChunkId() + " has started downloading...");
 
         while (downloaded < chunkStatus.getChunkSizeMB()) {
             // TODO: Generate a random sleep delay between min and max delay.
+            int delayTime = random.nextInt(config.getMinStepDelayMs(), config.getMaxStepDelayMs());
             // TODO: Sleep for that delay.
+            try {
+                Thread.sleep(delayTime);
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e); // not sure about this one!
+            }
             // TODO: Generate a random download amount for this step.
+            double currentDownloaded = random.nextDouble(config.getMinStepDownloadMB(), config.getMaxStepDownloadMB());
             // TODO: Increase downloaded, but do not go beyond chunk size.
+            while (downloaded <= 120) {
+                downloaded += currentDownloaded;
+            }
             // TODO: Save the updated downloaded value into chunkStatus.
+            chunkStatus.setDownloadedMB(downloaded);
             // TODO: Optionally print step-by-step progress.
         }
 
         // TODO: Mark the chunk as completed.
+        chunkStatus.setCompleted(true);
         // TODO: Record the chunk end time in chunkStatus.
+        chunkStatus.setEndTimeMs(System.currentTimeMillis());
         // TODO: Print a message that this chunk has finished downloading.
+        System.out.println(chunkStatus.getChunkId() + " has finished downloading.");
     }
 
 }

src/main/java/Main.java

@@ -37,7 +37,9 @@ public class Main {
             // TODO:
             // Students may print helpful debug information here,
             // for example which chunk is assigned to which worker thread.
+            System.out.println(chunk.getChunkId() + " is assigned to " + workerThread.getName());
         }
+        System.out.println();
 
         // 4. Create and start monitor thread
         ProgressMonitor monitor = new ProgressMonitor(config, chunks);
@@ -49,11 +51,15 @@ public class Main {
         //
         // Example idea:
         // monitorThread.start();
+        monitorThread.start();
 
         // 5. Start worker threads
         // TODO:
         // Start each worker thread in workerThreads.
         // Use a loop and call start() on each thread.
+        for (Thread wT: workerThreads){
+            wT.start();
+        }
 
         // 6. Wait for workers to finish
         // TODO:
@@ -61,9 +67,13 @@ public class Main {
         // This should be done inside a try-catch block for InterruptedException.
         //
         // Hint:
-        // for (Thread thread : workerThreads) {
-        //     thread.join();
-        // }
+         for (Thread thread : workerThreads) {
+             try {
+                 thread.join();
+             } catch (InterruptedException e) {
+                 throw new RuntimeException(e);
+             }
+         }
 
         // TODO:
         // After all workers finish, the monitor thread may also need to stop.
@@ -72,6 +82,11 @@ public class Main {
         // - add a stopping mechanism in ProgressMonitor later.
         //
         // If your monitor finishes automatically, you may join it here.
+        try {
+            monitorThread.join();
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
 
         // NOTE:
         // this final report may show 0 progress because no worker has actually run yet.

src/main/java/ProgressMonitor.java

@@ -57,6 +57,11 @@ public class ProgressMonitor implements Runnable {
 
             // TODO:
             // If all chunks are completed, print a final message and exit the loop
+            if (completedChunks == chunks.size())
+            {
+                System.out.println("all chunks are completed!");
+                break;
+            }
 
             try {
                 Thread.sleep(monitorDelayMs);