Java - Thread - doubt

I have a java thread program .

import java.util.*;
import java.lang.*;


class A extends Thread
{
public void run()
{
for(int i=1;i<=5;i++)
{System.out.println("\n error thread A:i="+i);
}
System.out.println("exit from A");
}
}

class B extends Thread
{
public void run()
{
for(int j=1;j<=5;j++)
{
System.out.println("\n error thread B:j="+j);
}
System.out.println("exit from B");
}
}


class C extends Thread
{
public void run(){
for(int k=1;k<=5;k++)
{System.out.println("\n error thread C:k="+k);}
System.out.println("exit from C");}
}
class ThreadTest{
public static void main(String args[])
{
new A().start();
new B().start();
new C().start();
}
}
 

Code (markup):

The output should be from the thread A, B, C. But it shows B, A , C

After executing this:

error thread B:j=1

 error thread B:j=2

 error thread B:j=3

 error thread B:j=4

 error thread B:j=5
exit from B

 error thread A:i=1

 error thread A:i=2

 error thread A:i=3

 error thread A:i=4

 error thread A:i=5
exit from A

 error thread C:k=1

 error thread C:k=2

 error thread C:k=3

 error thread C:k=4

 error thread C:k=5
exit from C

Code (markup):

Why is that?