add Report

.idea/markdown.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="MarkdownSettings">
+    <option name="previewPanelProviderInfo">
+      <ProviderInfo name="Compose (experimental)" className="com.intellij.markdown.compose.preview.ComposePanelProvider" />
+    </option>
+  </component>
+</project>

REPORT.md

@@ -0,0 +1,64 @@
+# Report
+
+## 1. start() vs run()
+
+Output:
+
+```text
+Calling run()
+Running in: main
+Calling start()
+Running in: Thread-2
+```
+
+When `run()` is called directly, it runs like a normal method, so it is executed by the main thread.
+
+When `start()` is called, Java creates a new thread, and then the `run()` method runs inside that new thread. That is why the second output shows `Thread-2`.
+
+So, `run()` does not start a new thread, but `start()` does.
+
+---
+
+
+## 2. Daemon Threads
+
+The output is not always the same. The main thread prints:
+
+```text
+Main thread ends.
+```
+
+and then finishes. Since the created thread is marked as a daemon thread using `setDaemon(true)`, the JVM does not wait for it to complete. As a result, the program may stop before the daemon thread finishes all 20 iterations. Depending on the scheduling, the message
+
+```text
+Daemon thread running...
+```
+
+may appear a few times or may not appear at all.
+
+If `setDaemon(true)` is removed, the thread becomes a normal user thread. In that case, the JVM waits for the thread to finish, and the message
+
+```text
+Daemon thread running...
+```
+
+will be printed 20 times before the program exits.
+
+Daemon threads are commonly used for background tasks such as logging, monitoring, and cleanup operations.
+
+
+
+
+## 3. A shorter way to create threads
+
+Output:
+
+```text
+Thread is running using a ...!
+```
+
+The syntax `() -> { ... }` is called a lambda expression.
+
+It is a shorter way to write a `Runnable`. Instead of creating a separate class or anonymous class, we write the thread task directly inside the `Thread` constructor.
+
+This makes the code shorter and easier to read.