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
65. Thread Priority in Java
Now Reading
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 multi-threaded programming, managing the execution order and resource allocation of threads is crucial for optimal performance. Thread priority in Java is fundamental to thread management in this program. By assigning priorities to threads, you can control their relative importance and determine which threads should be executed first when multiple threads compete for system resources.
In this guide, we will explore the thread priority in Java and cover some related topics, including the setter and getter methods and pertinent examples.
Thread priority in Java is an integer float double long that represents the importance of a thread. Threads with higher priority are more likely to be scheduled for execution before threads with lower priority, although this behavior is not guaranteed. Java provides a range of priorities and offers methods to set and retrieve the priority value of a thread.
An integer value from 1 to 10, with 1 being the lowest priority and 10 being the highest, represents thread priority in Java. The default priority assigned to a thread is 5. This range allows for a flexible and scalable approach to prioritizing threads based on their specific requirements.
To set the priority of a thread, you can use the `setPriority()` method provided by the Thread class. This method takes an integer argument representing the desired priority value. Similarly, the `getPriority()` method retrieves the current priority value of a thread.
Java's setter and getter methods for thread priority provide a means to assign and retrieve a thread's priority value. These methods permit dynamic manipulation of a thread's priority during runtime as well as the retrieval of information about the current priority setting.
Here are the main features of these techniques involving thread priority in Java:
1. setPriority(integer priority):
- Signature of the Method: 'public final void setPriority(int priority)'
- Description: This method sets the priority of a thread to the integer value specified.
- Descriptive Traits:
- An integer argument representing the intended priority value is accepted.
- Valid priority values range between 1 (minimum priority) and 10 (maximum priority).
- If an invalid priority value (outside the valid range) is provided, the method will raise a 'IllegalArgumentException'.
- This method is 'final', indicating subclasses cannot override it.
- Once the priority is set, it remains in effect until it is explicitly altered using'setPriority()' once more.
- The method can be invoked on an instance of the class 'Thread' or any of its subclasses.
2. getPriority():
- Method Signature: 'public final integer getPriority()'
- Description: This method retrieves the current thread priority.
- Descriptive Traits:
It returns an integer value representing the thread's current priority.
- The returned value will fall within the legitimate priority value range (1 to 10).
- If no explicit priority is specified for the thread, this function returns the default priority value, represented by the 'NORM_PRIORITY' constant (5).
- This method is 'final', indicating subclasses cannot override it.
- An instance of the 'Thread' class or any of its subclasses may invoke this method.
These setter and getter methods facilitate manipulating and retrieving information regarding a thread's priority. They enable dynamic control over the scheduling behavior of threads and allow you to fine-tune the execution order based on the relative importance of various threads within your application.
To illustrate the setter and getter methods of thread priority, consider the following example:
In this example, a new thread is created, and its priority is set to 7 using the `setPriority()` method. The `getPriority()` method is then used to retrieve the priority value, which is subsequently printed to the console. In this case, the output will be:
Here, the thread priority is set to 7, and the `getPriority()` method confirms the assigned priority.
The Thread class in Java provides three constants related to thread priority: `MIN_PRIORITY`, `NORM_PRIORITY`, and `MAX_PRIORITY`. These constants are predefined values representing the minimum, default, and maximum thread priorities.
- `MIN_PRIORITY`: This constant has a value of 1, representing the lowest possible thread priority.
- `NORM_PRIORITY`: With a value of 5, this constant represents the default priority assigned to threads if no priority is explicitly set.
- `MAX_PRIORITY`: This constant is set to 10, indicating the highest possible thread priority.
To understand these constants, consider the following example:
The output of this example will be:
Here, we use `System.out.println()` to display the values of the constants. The output shows the predefined values for the minimum, default, and maximum thread priorities.
Let's consider a practical example of thread priority in Java to understand how thread priority influences thread execution. Suppose we have two threads, `ThreadA` and `ThreadB`, with priorities set to 8 and 3, respectively.
In this scenario, `ThreadA` has a higher priority than `ThreadB`. However, it's important to note that thread priority only hints at the underlying operating system scheduler and may not always result in the expected execution order. The actual behavior depends on various factors, including the operating system and the system's workload.
The `setPriority()` method in Java may throw an `IllegalArgumentException` if an invalid priority value is provided. Let's consider an example:
In this case, since the value 15 exceeds the valid range of thread priorities (1-10), the `setPriority()` method will throw an `IllegalArgumentException`.
To further clarify the behavior of thread priorities in Java, let's explore an example where multiple threads with different priorities are created and executed.
In this example, three threads (`thread1`, `thread2`, and `thread3`) are created and assigned different priorities. The `run()` method of the `MyThread` class prints the priority of each thread when it is executed.
The output of this example will vary based on the underlying system and its scheduler. However, assuming the threads start and complete their execution, the output may look like this:
Here, the threads are executed in the order specified by their priorities. However, it's important to note that the actual execution order may differ due to factors such as the operating system's scheduling algorithm and the system's workload.
To demonstrate how to create a custom thread with a user-defined name and priority, consider the following example:
In this example, a `CustomThread` class is created, which extends the `Thread` class. The constructor of `CustomThread` accepts a name and priority as parameters, which are used to set the name and priority of the thread. The `run()` method of the `CustomThread` class prints the name and priority of the thread when it is executed.
The output of this example will be:
Here, we create two instances of the `CustomThread` class, `thread1` and `thread2`, with different names and priorities. The output shows that each thread executes with its respective name and priority.
A multi-threaded C++ program's thread priority determines its scheduling priority. Prioritizing threads helps regulate execution and resource allocation.
Thread priorities: C++ threads have priority values. The operating system and threading library affect the priority value range and interpretation.
Scheduling Policies: Operating systems use round-robin or priority-based scheduling to prioritize thread execution. These policies help the scheduler allot CPU time and resources to threads.
Thread Priority: Most threading libraries allow thread priority setting. These methods normally take a priority argument. Platform-specific priority levels vary.
Default Priorities: If none is set, the operating system or threading library may assign a default priority to each thread. Threads created without a priority level using the default priority.
Thread creation: Developers can set thread priority when building them. This lets the application manage threads with varying priorities.
Priority inheritance: Priority inheritance in some threading libraries boosts a thread's priority while it waits for a resource held by a lower-priority thread. This prevents priority inversion and ensures higher-priority threads get resources quickly.
Platform-Dependence: Thread priority behavior varies by the operating system and threading library. Developers should review platform-specific documentation to understand thread priority implementation on their target platform.
The operating system's scheduling mechanism, CPU availability, and system workload can affect thread priority and the ultimate execution order. Thread priority should be carefully considered based on application needs and system behavior.
To summarize, thread priority in Java allows you to control the threads' scheduling and resource allocation in a multi-threaded program. Developers can indicate the relative importance of threads and regulate their execution order by assigning priority to them.
However, it is crucial to remember that thread priority does not ensure a precise execution order, as it is determined by the underlying operating system's scheduler and other considerations. Thread priority should be handled with caution, considering the application's specific requirements and the system's behavior.
Thread priority in Java is useful in a variety of situations. It can be used to maintain a responsive user interface, prioritize real-time processing, properly allocate resources, coordinate thread execution, and effectively handle background operations. Developers may create multi-threaded programs that are efficient, responsive, and optimized for specific job requirements by understanding thread priority and its ramifications.
1. What is thread priority in Java?
Java thread priority is an integer property of threads that determines the order in which threads are scheduled for execution. This priority is the lowest value of a thread and the highest value of a thread. By default, every thread is given a priority of 5 (NORM_PRIORITY). The Java runtime system uses a thread priority to determine when one thread should be switched to another.
2. Are there any risks or disadvantages associated with manipulating thread priorities in Java?
There are certain risks involved in manipulating thread priorities. In some cases, high-priority threads can monopolize the CPU time, leading to a situation called "starvation", where lower-priority threads do not get a chance to run. This can lead to unpredictable behavior or performance issues.
3. What is the default priority of a thread in Java?
The default priority of a thread in Java is represented by the constant `NORM_PRIORITY`, which has a value of 5.
PAVAN VADAPALLI
Director of Engineering
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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...