extends Thread

class Worker extends Thread

$\{$

int id; $//$ not shared among threads; instance variable for an object, i$.$e$.,$ thread

Worker $($int id$)\{$

this.id $=$ id;

$\}$

$//$ need to be implemented; starting point of threads, whenstart$()$is called

public void run$()\{$

System.out.println$("$I am $"+$ id $+"\text{'}$th worker thread"$)$;

$\}$

$\}$

public class First

$\{$

public static void main$($String args$[])\{$

Worker runnerOne $=$ new Worker$(1)$; $//$ create a thread

Worker runnerTwo $=$ new Worker$(2)$;

runnerOne.start$()$; $//$ start the thread

runnerTwo.start$()$;

System.out.println$("$I am the main thread"$)$;

$\}$