what is the flow of this program?

[Radhakrishna Sharma Gorenta]

public class A {
	public A() {
        System.out.println("A");
    }
}

public class B extends A implements Serializable {
	public B() {
        System.out.println("B");
    }

}

public class Test {
	
	public static void main(String... args) throws Exception {
		B b = new B();
       
        ObjectOutputStream save = new ObjectOutputStream(new FileOutputStream("datafile"));
        save.writeObject(b); 
        save.flush(); 
        

        ObjectInputStream restore = new ObjectInputStream(new FileInputStream("datafile"));
        B z = (B) restore.readObject();

        

	}
	
}

[Mohamed Sanaulla]

Did you try executing it? May be you can use a debugger to find out the flow of the program, or may be add print statements to track the flow.

[Radhakrishna Sharma Gorenta]

the output of this program is:
A
B
A
but how ?

[Ulf Dittmer]

Here's a little hint: Replace

public class A {

by

public class A implements Serializable {

and see what happens. Can you conclude anything from that?

[Radhakrishna Sharma Gorenta]

yes.we can get output if we do that. but i want to know flow for this