Java.lang.Thread.start() Method

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Description

The java.lang.Thread.start() method causes this thread to begin execution, the Java Virtual Machine calls the run method of this thread.The result is that two threads are running concurrently: the current thread (which returns from the call to the start method) and the other thread (which executes its run method).

Declaration

Following is the declaration for java.lang.Thread.start() method

public void start()

Parameters

NA

Return Value

This method does not return any value.

Exception

IllegalThreadStateException − if the thread was already started.

Example

The following example shows the usage of java.lang.Thread.start() method.

package com.tutorialspoint;

import java.lang.*;

public class ThreadDemo implements Runnable {

   Thread t;
   ThreadDemo() {
    
      // thread created
      t = new Thread(this, "Admin Thread");
     
      // prints thread created
      System.out.println("thread  = " + t);
      
      // this will call run() function
      System.out.println("Calling run() function... ");
      t.start();
   }

   public void run() {
      System.out.println("Inside run()function");
   }

   public static void main(String args[]) {
      new ThreadDemo();
   }
} 

Let us compile and run the above program, this will produce the following result −

thread = Thread[Admin Thread,5,main]
Calling run() function...
Inside run()function