Linking the different classese together

Question

I am writing a program the includes several classes, say A,B and C, with the main method in A. The problem is that I can create an instance of B and C and use their methods and access their variables. However, I am unable to access methods and variable of A from B or C. How should i do this??

Answer 1

By passing a reference of A to B:public class A{
private B b= null;
public static void main(String args[]){
   A a = new A();
   a. init();
private void init(){
  b = new B(This);
  b. do();
public void hello(){
  System.out.println("Hello");
public class B{
private A a= null;
public B(A aa){
  a = aa;
public void do(){
  a.hello();