Java Multithreading Tutorial

Multithreading allows concurrent execution parts of a program. Each part of a program is called thread. So, threads are light-weight processes.A thread begins inside run() method.Call start() method is used to start the execution of a thread. Start() invokes the run() method.

Java Thread Methods

getName(): Name of the thread

getPriority(): Get thread?s priority

isAlive(): Thread is still running status.

join(): Waiting for thread to terminate

run(): Entry point of the thread

sleep(): suspend a thread for a period of time

start(): start a thread by calling its run() method

Thread creation

Thread can be created using java.lang.Thread class.Thread class overrides the run() method.start() method is used to start the execution of a thread.

Example

class Multithreading implements Runnable{  
  public void run(){  
    System.out.println("My thread is in running state.");  
  }   
  public static void main(String args[]){  
     Multithreading obj=new Multithreading();  
     Thread sobject =new Thread(obj);  
     sobject.start();  
 }  
}

Java Multithreading Example

class MultithreadingDemo extends Thread 
{ 
    public void run() 
    { 
        try 
        { 
            // Displaying the thread that is running 
            System.out.println ("Thread " + 
                  Thread.currentThread().getId() + 
                  " is running"); 
  
        } 
        catch (Exception e) 
        { 
            // Throwing an exception
 
            System.out.println ("Exception is caught"); 
        } 
    } 
} 
  
// Main Class 
public class Multithread 
{ 
    public static void main(String[] args) 
    { 
        int n = 8; // Number of threads 
        for (int i=0; i<8; i++) 
        { 
            MultithreadingDemo object = new MultithreadingDemo(); 
            object.start(); 
        } 
    } 
}

Output:

Thread 8 is running 
Thread 9 is running
Thread 10 is running
Thread 11 is running
Thread 12 is running
Thread 13 is running
Thread 14 is running
Thread 15 is running