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+1: 
+        the output is Calling run()
+        Running in: main
+        Calling start()
+        Running in: Thread-2
+
+t1.run() does not start a new thread. 
+It just calls the run() method like a normal method call, and it executes on the current thread.
+t2.start() creates a new thread and then that new thread executes run(), so current Thread Name becomes Thread-2.
+
+run() is just a normal method call, so it runs in the current thread.
+
+start() creates a new thread, and that new thread executes run().
+
+2:
+        Output:
+                Main thread ends.
+                It may also print:
+                Daemon thread running…
+                a few times, or sometimes not at all.
+        Why:
+                Because the created thread is a daemon thread. Daemon threads run in the background, and when the main thread finishes, the JVM can stop immediately. 
+                So the daemon thread may not complete its loop.
+        If thread.setDaemon(true) is removed:
+                Then the thread becomes a user thread (non-daemon thread).
+                and the JVM will wait for it to finish, so "Daemon thread running..." will print many times until the loops end.
+        Real-life uses of daemon threads:
+                Garbage collection
+                Background auto-save
+                Cache cleanup
+                Monitoring or logging services
+                Timer or scheduler tasks running in background
+3:
+        What output do you get from the program?
+                Thread is running using a …!
+        What is the () -> { ... } syntax called?
+                This is called a lambda expression.
+        
+        How is this code different from creating a class that extends Thread or implements Runnable?
+                This is a shorter and cleaner way to write thread code. 
+                Instead of creating a separate class, the task is written directly inside the lambda expression.