Java/J2EE and SOA (348 Blogs) Become a Certified Professional
AWS Global Infrastructure

Programming & Frameworks

Topics Covered
  • C Programming and Data Structures (16 Blogs)
  • Comprehensive Java Course (4 Blogs)
  • Java/J2EE and SOA (345 Blogs)
  • Spring Framework (8 Blogs)
SEE MORE

Join method in Java: How to join threads?

Last updated on Nov 29,2022 31.5K Views

Aayushi Johari
A technophile with a passion for unraveling the intricate tapestry of the... A technophile with a passion for unraveling the intricate tapestry of the tech world. I've spent over a decade exploring the fascinating world of...
67 / 72 Blog from Java Core Concepts

A thread in Java is considered to be a thread of execution in a program. Java.lang.thread includes various methods which help in running multiple threads concurrently. One of the commonly used method is the Join Method in Java. Let’s explore this method in the below sequence.


Let’s get started.

What is a Join Method in Java?

Join method in Java allows one thread to wait until another thread completes its execution. In simpler words, it means it waits for the other thread to die. It has a void type and throws InterruptedException. Joining threads in Java has three functions namely,

  • join()
  • join(long millis)
  • join(long millis, int nanos)
MethodDescription

join()

Waits for this thread to die

join(long millis)

Waits at most millis milliseconds for this thread to die

join(long millis, int nanos)

Waits at most millis milliseconds plus nano nanoseconds for this thread to die

Syntax:

  • public final void join()
  • public final void join(long millis, int nanos)
  • public final void join(long millis)

 

Java Program to implement Thread.join Method

Let’s implement all the joins in Java one by one.

 

Example of join() Method in Java

package Edureka;

import java.io.*; 
import java.util.*; 

public class Threadjoiningmethod extends Thread{  
		 public void run(){  
		  for(int i=1;i<=4;i++){  
		   try{  
		    Thread.sleep(500);  
		   }catch(Exception e){System.out.println(e);}  
		  System.out.println(i);  
		  }  
		 }  
		public static void main(String args[]){  
			Threadjoiningmethod th1=new Threadjoiningmethod ();  
			Threadjoiningmethod th2=new Threadjoiningmethod ();  
			Threadjoiningmethod th3=new Threadjoiningmethod ();  
		 th1.start();  
		 try{  
		  th1.join();  
		 }
		 catch(Exception e){
			 System.out.println(e);
			 }  
		  
		 th2.start();  
		 th3.start();  
		 }  
		}

Output:

1
2
3
4
1
1
2
2
3
3
4
4

Explanation: Here you can notice thread1 first complete its task, then thread2 and thread3 will execute.

 

Example of join(long millis) Method in Java

package Edureka;

import java.io.*; 
import java.util.*; 

public class Threadjoiningmethod extends Thread{  
		 public void run(){  
		  for(int i=1;i<=4;i++){  
		   try{  
		    Thread.sleep(200);  
		   }catch(Exception e){System.out.println(e);}  
		  System.out.println(i);  
		  }  
		 }  
		public static void main(String args[]){  
			Threadjoiningmethod th1=new Threadjoiningmethod();  
			Threadjoiningmethod th2=new Threadjoiningmethod();  
			Threadjoiningmethod th3=new Threadjoiningmethod();  
		 th1.start();  
		 try{  
		  th1.join(1000);  
		 }
		 catch(Exception e){
			 System.out.println(e);
			 }  
		  
		 th2.start();  
		 th3.start();  
		 }  
		}

 

Output:

1
2
3
4
1
1
2
2
3
3
4
4

Explanation: Here you can notice thread1 completes its task for 200millisecond(4 times as sleep time is 200),  then thread2 and thread3 will execute.

If you’re just beginning, then watch at this Java Tutorial to Understand the Fundamental Java Concepts.

Thus we have come to an end of this article on ‘Join method in Java’. If you wish to learn more, check out the Java Online Training by Edureka, a trusted online learning company. Edureka’s Java J2EE and SOA training and certification course is designed to train you for both core and advanced Java concepts along with various Java frameworks like Hibernate & Spring.

Got a question for us? Please mention it in the comments section of this blog “Join method in Java”  and we will get back to you as soon as possible.

Upcoming Batches For Java Certification Training Course
Course NameDateDetails
Java Certification Training Course

Class Starts on 27th April,2024

27th April

SAT&SUN (Weekend Batch)
View Details
Java Certification Training Course

Class Starts on 18th May,2024

18th May

SAT&SUN (Weekend Batch)
View Details
Comments
0 Comments

Join the discussion

Browse Categories

webinar REGISTER FOR FREE WEBINAR
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP

Subscribe to our Newsletter, and get personalized recommendations.

image not found!
image not found!

Join method in Java: How to join threads?

edureka.co