Tutorial Playlist
191 Lessons1. Introduction to Java
2. What is Java?
3. History of Java
4. Java Tutorial for Beginners
5. How Do Java Programs Work?
6. JDK in Java
7. C++ Vs Java
8. Java vs. Python
9. Java vs. JavaScript
10. From Java Source Code to Executable
11. How to Install Java in Linux
12. How to Install Java in Windows 10
13. Java Hello World Program
14. Structure of Java Program and Java Syntax
15. Operators in Java
16. Java If-else
17. Switch Case In Java
18. Loops in Java
19. Infinite loop in Java
20. For Loop in Java
21. For Each Loop in Java
22. Constructor in Java
23. Constructor Overloading in Java
24. Copy Constructor in Java
25. Default Constructor in Java
26. Parameterized Constructors in Java
27. Constructor Chaining In Java
28. Finalize Method in Java
29. Static Method in Java
30. Equals Method in Java
31. Abstract Method in Java
32. toString() Method in Java
33. Difference between equals method in Java
34. Inheritance in Java
35. Multiple Inheritance in Java
36. Hierarchical Inheritance in Java
37. Java Classes and Objects
38. Scanner Class in java
39. All classes in java are inherited from which class
40. What is Nested Class in Java
41. POJO Class in Java
42. Anonymous Class in Java
43. Final Class in Java
44. Object Class in Java
45. Packages in Java
46. Access Modifiers in Java
47. Static Keyword In Java
48. Final Keyword in Java
49. Checked and Unchecked Exceptions in Java
50. User Defined Exception in Java
51. Error vs. Exception in Java
52. Java Collection
53. Collections in Java
54. Garbage Collection in Java
55. Generics In Java
56. Java Interfaces
57. Functional Interface in Java
58. Marker Interface in Java
59. Streams in Java
60. Byte stream in java
61. File Handling in Java
62. Thread in Java
63. Thread Lifecycle In Java
64. Daemon Thread in Java
Now Reading
65. Thread Priority in Java
66. Deadlock in Java
67. String Pool in Java
68. Java Database Connectivity(JDBC)
69. Design Patterns in Java
70. Functional Programming in Java
71. OOP vs Functional vs Procedural
72. Heap Memory and Stack Memory in Java
73. Applet in Java
74. Java Swing
75. Java Frameworks
76. Hibernate Framework
77. JUnit Testing
78. How to Install Eclipse IDE for Java?
79. Command line arguments in Java
80. Jar file in Java
81. Java Clean Code
82. OOPs Concepts in Java
83. Java OOPs Concepts
84. Overloading vs Overriding in Java
85. Java 8 features
86. String in Java
87. String to int in Java
88. Why String Is Immutable in Java?
89. Primitive Data Types in Java
90. Non-Primitive Data Types in Java
91. This and Super Keyword in Java
92. HashMap in Java
93. Comparable And Comparator in Java
94. Type Casting in Java
95. Arrays Sort in Java with Examples
96. Variable Hiding and Variable Shadowing in Java
97. Enum in Java
98. Substring in Java
99. Pattern Programs in Java
100. Hashcode in Java
101. What is ByteCode in Java?
102. How To Take Input From User in Java
103. GCD of Two Numbers in Java
104. Linked List in Java
105. Arithmetic Operators in Java
106. Conditional Operators in Java
107. Stack and Queue in Java
108. Array Length in Java
109. Number Pattern Program in Java
110. Split in java
111. Map In Java
112. Difference Between Throw and Throws in Java
113. Difference Between Data Hiding and Abstraction
114. HashSet in Java
115. String Length in Java
116. Factorial Using Recursion in Java
117. DateFormat in Java
118. StringBuilder Class in java
119. Instance variables in Java
120. Java List Size
121. Java APIs
122. Reverse an Array in Java
123. StringBuffer and StringBuilder Difference in Java
124. Java Program to Add Two Numbers
125. String to Array in Java
126. Regular Expressions in Java
127. Identifiers in Java
128. Data Structures in Java
129. Set in Java
130. Pass By Value and Call By Reference in Java
131. Try Catch in Java
132. Bubble Sort in Java
133. Caesar Cipher Program in Java
134. Queue in Java
135. Object Creation in Java
136. Multidimensional Array in Java
137. How to Read a File in Java
138. String Comparison in Java
139. Volatile Keyword in Java
140. Control Statements in Java
141. Jagged Array in Java
142. Two-Dimensional Array in Java
143. Java String Format
144. Replace in Java
145. charAt() in Java
146. CompareTo in Java
147. Matrix Multiplication in Java
148. Static Variable in Java
149. Event Handling in Java
150. parseInt in Java
151. Java ArrayList forEach
152. Abstraction in Java
153. String Input in Java
154. Logical Operators in Java
155. instanceof in Java
156. Math Floor in Java
157. Selection Sort Java
158. int to char in Java
159. Stringtokenizer in java
160. Implementing and Manipulating Abs in Java
161. Char array to string in java
162. Convert Double To String In Java
163. Deque in Java
164. Converting a List to an Array in Java
165. The Max function in java
166. Removing whitespace from string in java
167. String arrays in Java
168. Strings in Java Vs Strings in Cpp
169. Sum of digits of a number in Java
170. Art of Graphical User Interfaces
171. Trim in Java
172. RxJava
173. Recursion in Java
174. HashSet Java
175. Difference Between Java and Python
176. Square Root in Java
177. Reverse A String in Java
178. Even Odd Program in Java
179. Fibonacci Series in Java
180. Prime Number Program in Java
181. Java Program to Print Prime Numbers in a Given Range
182. Java Leap Year Program
183. Swapping of Two Numbers in Java
184. LCM of Two Numbers in Java
185. Math.sqrt() Function in Java
186. Area of Triangle in Java
187. Sort a String In Java
188. Factorial Program in Java
189. Javafx
190. Lambda expression in java
191. Setup Java Home and IDE on macOS
In the realm of Java multithreading, the concept of daemon threads plays a vital role. Daemon threads are a special type of thread that runs in the background and provides support services to non-daemon threads. Understanding the behavior and characteristics of daemon threads is crucial for writing efficient and scalable Java applications. In this article, we will delve into the world of daemon thread in Java, exploring its definition, default nature, methods, examples, and how it differ from user threads.
Java threads form the cornerstone of concurrent programming, facilitating the execution of multiple tasks in unison within one program. Among these threads, Daemon threads stand out, bearing distinct traits when compared to user threads. These threads cater to auxiliary services and are designed to cease functioning once all non-daemon threads have concluded their operations. Let's explore the Daemon thread in Java with examples to unravel its nature in more detail.
A daemon thread is a thread that runs in the background and does not prevent the Java Virtual Machine (JVM) from exiting when all non-daemon threads in Java have been completed. These threads are typically used to perform background tasks such as garbage collection, monitoring, and other system-level operations. Daemon threads are created using the `setDaemon(true)` method of the `Thread` class.
Let's understand this concept through an example:
Output:
Explanation:
In the above example, we create a daemon thread that runs an infinite loop and prints a message every second. Since it is a daemon thread, it doesn't prevent the JVM from exiting when the main thread completes its execution. Thus, the program terminates immediately after printing the "Main thread is exiting." message.
Even though daemon threads do not impede the JVM from terminating, they are automatically stopped when there are no user threads running. The rationale behind this behavior lies in the fact that daemon threads are meant to provide supporting services to non-daemon threads. When all non-daemon threads complete, there is no need to continue the execution of daemon threads as they primarily exist to assist the application's main functionality.
By default, threads created in Java are user threads. This means that the JVM waits for user threads to complete before terminating the program. On the other hand, daemon threads, as mentioned earlier, do not prevent the JVM from exiting. The default nature of threads can be altered using the `setDaemon(boolean)` method of the `Thread` class.
Daemon threads possess several properties that distinguish them from user threads. Let's explore these properties:
1. Execution in the Background: Daemon threads run in the background, performing tasks that do not require user interaction.
2. Termination on Program Exit: Daemon threads are automatically terminated when all non-daemon threads have completed their execution.
3. Supporting Role: Daemon threads exist to provide auxiliary services to user threads, such as garbage collection, logging, or monitoring.
The `Thread` class provides several methods to control and manage daemon threads. Let's discuss some of the commonly used methods to understand how to create Daemon thread in Java:
1. `setDaemon(boolean)` - Sets the thread as a daemon thread if the argument is true.
2. `isDaemon()` - Checks if the thread is a daemon thread.
3. `getId()` - Returns the unique identifier of the thread.
4. `getPriority()` - Returns the priority of the thread.
To further solidify our understanding, let's explore a couple of practical examples involving daemon threads:
Output:
Explanation:
In this example, we create a daemon thread responsible for monitoring logs in the background. It continuously checks for new log entries and performs the necessary processing. Meanwhile, the main application carries out its tasks independently.
Example 2: Daemon Thread for Garbage Collection
Output:
Explanation:
In this example, we create a daemon thread responsible for invoking garbage collection at regular intervals. It performs the necessary cleanup operations in the background, ensuring optimal memory usage for the main application.
Daemon threads can encounter exceptions just like any other thread. However, if an exception occurs in a daemon thread and it is not caught and handled, it can cause the JVM to terminate abruptly. It is essential to handle exceptions appropriately to prevent an unexpected termination of the program.
To halt a daemon thread in Java, do the following:
1. Define a termination condition: Define a condition that specifies when the daemon thread's execution should be terminated.
2. Check the termination condition: Check the termination condition within the daemon thread's code on a regular basis.
3. Terminate the thread gracefully: When the termination condition is met, terminate the thread's execution loop and conduct any necessary cleanup.
It should be noted that daemon threads are intended to offer supporting services and are stopped once all non-daemon threads have concluded. As a result, halting a daemon thread should be done carefully to ensure appropriate termination and to avoid unexpected behavior in your application.
User threads and daemon threads have various properties and are used for different things in Java applications. Let's examine some further comparisons between these two thread types:
1. JVM Termination
2. Application Termination:
3. The type of work:
4. Synchronization and Control:
5. Error Handling:
You may successfully employ each kind according to its intended purpose by understanding the distinctions between daemon threads and user threads. This will help you create multithreaded programs that are well-designed and effective.
When all non-daemon threads complete their execution, the JVM assumes that the application's main functionality is over. As daemon threads primarily exist to support user threads, they are terminated to avoid unnecessary resource consumption and to allow the JVM to exit gracefully.
Non-daemon threads are the default type of threads in Java. Unlike daemon threads, non-daemon threads prevent the JVM from terminating until they complete their execution. They are typically used for crucial tasks and operations that require explicit handling and synchronization.
Daemon threads run in the background, separate from the main execution flow of the program. They continue their execution as long as there are non-daemon threads actively running. Once all non-daemon threads are complete, the JVM terminates, along with any remaining daemon threads.
Daemon threads in Java serve as essential components for performing background tasks and providing auxiliary services. Their distinct behavior and properties make them ideal for tasks such as garbage collection, monitoring, and other system-level operations. By understanding the nature of daemon threads and utilizing them effectively, you can enhance the efficiency and responsiveness of your Java applications. You can also implement the learnings from this discourse to use Daemon Thread in Java in Hindi or other supported languages.
As a ready-reckoner, refer to the critical takeaways from this article:
1. What happens if an exception occurs in a daemon thread and is not handled?
If an exception occurs in a daemon thread and is not caught and handled, it can cause the JVM to terminate abruptly.
2. Are daemon threads suitable for critical tasks in an application?
Daemon threads are typically not recommended for critical tasks in an application. They are designed to provide supporting services and are terminated when all non-daemon threads are complete. Critical tasks often require explicit control, synchronization, and error handling, which are better suited for non-daemon threads.
3. What are some common use cases for daemon threads in Java?
Daemon threads are frequently used for background logging, periodic maintenance, event listeners, and supporting services like timers and schedulers. They provide constant support for the application's principal functionality without interfering with its execution.
PAVAN VADAPALLI
Director of Engineering
Director of Engineering @ upGrad. Motivated to leverage technology to solve problems. Seasoned leader for startups and fast moving orgs. Working …Read More
Popular
Talk to our experts. We’re available 24/7.
Indian Nationals
1800 210 2020
Foreign Nationals
+918045604032
upGrad does not grant credit; credits are granted, accepted or transferred at the sole discretion of the relevant educational institution offering the diploma or degree. We advise you to enquire further regarding the suitability of this program for your academic, professional requirements and job prospects before enrolling. upGrad does not make any representations regarding the recognition or equivalence of the credits or credentials awarded, unless otherwise expressly stated. Success depends on individual qualifications, experience, and efforts in seeking employment.
upGrad does not grant credit; credits are granted, accepted or transferred at the sole discretion of the relevant educational institution offering the diploma or degree. We advise you to enquire further regarding the suitability of this program for your academic, professional requirements and job prospects before enr...