Why the following code does not give the same output when we compile it again and again?

class A implements Runnable
{
    Thread t;
    String s;
    A(String st)
    {
        s=st;
        t=new Thread(this,s);
        System.out.println(s+" "+t);
        t.start();
    }
    
    public void run()
    {
        try
        {
            for(int i=5;i>0;i--)
            {
                System.out.println(i);
                Thread.sleep(4000);
            }
        }
        catch(InterruptedException e)
        {
            System.out.println(e);
        }
        System.out.println("In Run()");
    }
}
public class demo14 {
    public static void main(String args[])
    {
        A t1=new A("one");
        A t2=new A("two");
        A o3=new A("three");
        System.out.println("In main");
        
    }
}