Interface Errors(Weaker Access Privileges )

[prasadkowli80]

hello friends ,
i have written a simple java program .See the code below :

nterface A {
void test();
}


class B implements A {

void test() {
System.out.println(" i am in B ");
}
}//end of class B

class InterfaceDemo {
public static void main(String args[]) {

B ob = new B();
ob.test();
}
} // end of class InterfaceDemo

This program after compiling gives the following error :

" test() in B cannot implement test() in A; attempting to assign weaker access privileges; was public "

i know the solution is : --> "In the implementation, explicitly declare the implementing method as public"
But i dont know the reason behind it .......i want to know
" the method should be declared public "??????
Can please anybody clearly explain me in details ??
Thanx in advance ,
Prasad