moved daemon thread examples from core-java-concurrency-advanced to core-java-concurrency-advanced-2

core-java-modules/core-java-concurrency-advanced-2/README.md

@@ -4,3 +4,4 @@
 
 ### Relevant Articles: 
 - [Semaphores in Java](https://www.baeldung.com/java-semaphore)
+- [Daemon Threads in Java](https://www.baeldung.com/java-daemon-thread)

core-java-modules/core-java-concurrency-advanced-2/src/main/java/com/baeldung/concurrent/daemon/NewThread.java

@@ -0,0 +1,23 @@
+package com.baeldung.concurrent.daemon;
+
+public class NewThread extends Thread {
+    public void run() {
+    	long startTime = System.currentTimeMillis();
+        while (true) {
+            for (int i = 0; i < 10; i++) {
+                System.out.println(this.getName() + ": New Thread is running..." + i);
+                try {
+                    //Wait for one sec so it doesn't print too fast
+                    Thread.sleep(1000);
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                }
+            }
+            // prevent the Thread to run forever. It will finish it's execution after 2 seconds
+            if (System.currentTimeMillis() - startTime > 2000) {
+            	Thread.currentThread().interrupt();
+            	break;
+            }
+        }
+    }
+}

core-java-modules/core-java-concurrency-advanced-2/src/test/java/com/baeldung/concurrent/daemon/DaemonThreadUnitTest.java

@@ -0,0 +1,31 @@
+package com.baeldung.concurrent.daemon;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Ignore;
+import org.junit.Test;
+
+public class DaemonThreadUnitTest {
+
+    @Test
+    @Ignore
+    public void whenCallIsDaemon_thenCorrect() {
+        NewThread daemonThread = new NewThread();
+        NewThread userThread = new NewThread();
+        daemonThread.setDaemon(true);
+        daemonThread.start();
+        userThread.start();
+
+        assertTrue(daemonThread.isDaemon());
+        assertFalse(userThread.isDaemon());
+    }
+
+    @Test(expected = IllegalThreadStateException.class)
+    @Ignore
+    public void givenUserThread_whenSetDaemonWhileRunning_thenIllegalThreadStateException() {
+        NewThread daemonThread = new NewThread();
+        daemonThread.start();
+        daemonThread.setDaemon(true);
+    }
+}