Java program doubt

Question

Can someone pls explain THIS PROGRAM

How many lines of output will this code produce?
class B implements Runnable {
public void run() {
System.out.println("B");
}
}
class A extends Thread {
public void run() {
System.out.println("A");
Thread t = new Thread(new B());
t.start();
}
public static void main(String[ ] args) {
A object = new A();
object.start();
}
}

Answer 1

Why do you want it to be explained...?

Answer 2

This will output two lines.
A
B

When you say object.start() a new thread is created and the run method inside class A gets called. It first prints 'A' then inside you are creating a thread of class B.
So t.start() will again create a new thread and it will call the run method of class B which prints 'B'.

In total there are 3 threads including the main thread.