overriding question

[radhika holani]

//File A.java
package a;
public class A
{
A(){ }
public void print(){ System.out.println("A"); }
}
//File B.java
package b;
import a.*;
public class B extends A
{
B(){ }
public void print(){ System.out.println("B"); }
public static void main(String[] args)
{
new B();
}
}

please explain me the o/p of the above program.

[Lukas Stephienn]

Constructor in class A has default access so it cannot be invoked from other packages.
If you extend from class A, it is mandatory to invoke its constructor (explicitly or implicitly).