Are you interested in understanding the concept of “multithreading in Java“? Have you ever wondered about the methods of multithreading in Java? In this article, we will discuss the different methods with codes to make learning more easy for you. Furthermore, if you need any Java coding assistance you have the option to hire skilled experts from CodingZap!
What Is Single Thread and Multi Thread in Java?
Threads are the light-weighted part of the program. This is like the program inside of a program. Thread is particularly used when during the program, some other tasks need to be executed or performed.
There are two types of thread, single thread & multi-thread.
Single threads are the thread that is being used only one time inside of the program. There is very less use of this concept as a single thread can’t able to fulfill all the necessities. It can be further divided into two parts. One is a user thread & another is a demon thread that is used for application cleaning.
// Example Of Single Thread
public class Main{
public static void main(String[] args) {
System.out.println("Single Thread");}} // Only One Thread
Multithreading is a different concept. In the multithreading concept, several threads can be implemented with each other. And each of them will work completely well manner. Multithreading in Java helps a lot in animation & gaming purposes.
// Example Of Multiple Threads
public class Zap implements Runnable{
public static void main(String[] args) {
Thread T1 = new Thread("One1"); // Declaration Of One Thread
Thread T2 = new Thread("One2"); // Declaration Of Second Thread
T1.start(); // Starting First Thread
T2.start(); // Starting Second Thread
System.out.println(T1.getName());
System.out.println(T2.getName());}
@Override
public void run() {}} // Overriding The Function
What Is The Importance Of Multithreading In Java?
Multithreading operation is important because it enables to use of other operations in the program when the other function is still running. The threads the independent. So, if there is one error in one thread, it will not impact much in the program.
Multithreading operation also requires small memory space. The same memory space is being used again & again.
This reduces the memory exhaustion problem in the programming languages. Using multithreading will help to utilize the CPU at its best performance.
What Is The Life Cycle of Thread In Java?
We know already that the thread is a complete program itself. So, there should be some stages by which the complete thread execution is done. The complete execution of the thread is known as its life cycle. And there are some stages present.
- New State: When a thread is first declared in the program & compiler gets it, it falls under the new state. That means it is like a completely new baby that exists but can’t able to perform anything. Such a state is known as a born state also.
- Runnable State: You can assume the thread is now grown a bit & can able to perform some tasks. The state is known as the runnable state. Here, the scheduler gets control of the thread that helps to execute some operations.
- Running State: It is the intermediate state. The thread in this state start executing its task & it has grown fully for doing all operations. Here, the scheduler picks one thread from multi threads & starts executing.
- Waiting State (Optional): Sometimes, the threads belong to the waiting state. There are several threads present & for the sake of synchronization the threads sometimes stop working & other threads start working.
- Dead State: When the thread completes its operation, it becomes the dead element or dead thread. The state is known as the dead state. Here, the termination of the thread is done by the compiler.
Every thread declared in the Java program must follow the above stages. The concept will be more clear with more examples.
What Are The Methods For Multithreading In Java? Get To Know
There are mainly two methods for multithreading in Java. An example of multithreading in Java will help you to understand those methods properly. Those two methods are:
- Using Thread Class
- Using Runnable Interface
Let us try to know about these methods one by one in a brief to know about multithreading in Java. If else statement is also an interesting topic to discover. if you’re learning Java then you must read our article.
Let us try to implement the above methods with an example. That will help to understand multithreading in Java for example.
How To Do Multithreading In Java Using Thread Class?
In Java, there is a class present as java.lang.Thread. This is the class that is completely dedicated to the use of threads. In this method, one class will be declared that is going to extend the thread class & implement some function inside.
In the thread class, the function should be declared as the run() function because it is the starting point of the execution process. And in the main function, the start() function should be declared to get inside the runnable state of the thread.
Code To Execute Java Multithreading Using Thread Class:
class CodingZap extends Thread {
public void run(){
// Displaying The Thread Which Is Running
System.out.println(Thread.currentThread().getId()+ ": Thread Is Executing");
}}
public class Main{
public static void main(String[] args) {
int n = 5; // Thread Numbers
for (int i = 0; i < n; i++) {
CodingZap obj = new CodingZap(); // Creating Object
obj.start();}}}
Steps of the program:
- At first, we need to declare one class that will extend the Thread class.
- Now, inside of that, we need to write the run() method. And Inside the run() method, we have written some statements.
- Now, we have taken some values that will be used for calling the Java threads multiple times. For that reason, one for-loop is implemented.
- Now, we need to make an object of the declared class. Using that object, we need to start the thread.
Let us try to find out the output of the above code. This will help to understand multithreading in JavaScript.
Output:
From the above output, we can see that the threads are running properly. And random digits are printed in the console which demonstrated the proper use of the thread class.
How To Do Multithreading In Java Using Runnable Interface?
Now, the use of the Runnable interface method is more than similar to the thread class extends form. But the runnable interface is used because we are not performing extended operations here. Java doesn’t provide multiple inheritance options. So, using the Runnable interface will help to extend other classes if necessary.
In this case, the Java program uses the java.lang.Runnable interface operation rather than using any class. Now, here also the implementation will start from the start() function until it gets the run() function inside of the program.
Code To Execute Java Multithreading Using Runnable Interface
class CodingZap implements Runnable {
public void run(){
// Displaying The Thread Which Is Running
System.out.println(Thread.currentThread().getId()+ ": Thread Is Executing");
}}
public class Main{
public static void main(String[] args) {
int n = 5; // Thread Numbers
for (int i = 0; i < n; i++) {
Thread obj = new Thread(new CodingZap()); // Creating Object
obj.start();}}}
Steps Of The Program:
- Here, We need to declare one class that will implement the Runnable function.
- Now, inside of that, we need to write the run() method. Inside the run() method, we have written some statements.
- Now, inside the main() method, we need to make an object of the declared class but in a different manner.
- We need to first create the object of the thread. Now, we need to cast the declared class object inside of that.
- Using that object, we need to start the thread using the start() function. And the implemented loop will call the function multiple times.
Let us try to find out the output of the above code. This will help to understand the example of multithreading in Java.
Output:
The above output is also showing some random numbers printing in the console which is the proof of proper execution of the code. The thread which is running first is giving a certain integer number as the output.
Conclusion:
As we saw, multithreading in Java is a very important topic.
We have to always remember what is multithreading in Java. Multithreading Java helps us to solve difficult problems in the future.
Multithreading in Java with examples is a very important sub-topic of this content. It is advisable to clear the basis of the Java programming language. This will help a lot in the future.
Since you’re learning programming then you must be curious to know about their applications. You can check out C++ applications and attain more knowledge.
So, hope you have liked this piece of article. Share your thoughts in the comments section and let us know if we can improve more.
