/**

* The program currently prints "s before Super() finished is Hello"

* followed by "s after Super() finished is Hello"

*

* If the declaration 'String s' is changed to 'String s = null'

* the program prints "s after Super() finished is null"

*

* I know this is the wrong way to do things, but my question is

* Why isn't the initialisation of instance var s set to null even if

* I don't explicitly say 'String s = null' i.e. what happened to the

* default initialisation to null??

*

*/



class Super {

&nbsp&nbsp public Super() {

&nbsp&nbsp&nbsp&nbsp init() ;

&nbsp&nbsp }



&nbsp&nbsp protected void init() {}

}



class Sub extends Super {

&nbsp&nbsp String s;



&nbsp&nbsp public Sub() {

&nbsp&nbsp&nbsp&nbsp super();

&nbsp&nbsp&nbsp&nbsp System.out.println("s after Super() finished is " + s);

&nbsp&nbsp}



&nbsp&nbsp protected void init() {

&nbsp &nbsp &nbsp&nbsp s = "Hello!";

&nbsp&nbsp &nbsp&nbsp System.out.println("s before Super() finished is " + s);

&nbsp&nbsp }

}



public class Test1 {

&nbsp&nbsp public static void main(String[] args) {

&nbsp&nbsp&nbsp&nbsp new Sub();

&nbsp&nbsp }

}