How to update and use the values of variables of another class

Question

I can we update or use the values of the variables of another class. For example, if we have class A
public class A //(situated in package view)
public s0,s1;
public void runFunction()
...some coding and proceedings
s0="Hi";s1"Hello";
......some coding
RequestDispatcher dispatcher = request.getRequestDispatcher("/MainUser.jsp?alert=F");
dispatcher.forward(request, response);
ARunner.jsp
<jsp:useBean id="a" class="view.A" scope="session"/>
<%
a.runFunction();
%>
MainUser.jsp
<jsp:useBean id="a" class="view.A" scope="session"/>
<%
System.out.println("S0:"+a.s0+" S1:"+a.s1); //should print S0:Hi S1:Hello, but printing S0:null S1:null
%>
A.class has some procedures and String variables which can be updated and later can be used in JSP pages. The project starts with ARunner.jsp which uses the A.class and updates the values of string variables s0 and s1of A to hi and hello respectively.And then redirects the page to MainUser.jsp.
Now what I want is ,when I call those string variables(s0 & s1 of A.class) in any another jsp likeMainUser.jsp it should give me the value of hi and hello respectively not null as it is giving right now. Could you refine the coding for this one?

Answer 1

public class A //(situated in package view)
public String s0,s1;
public void runFunction()
...some coding and proceedings
s0="Hi";s1"Hello";
......some coding
RequestDispatcher dispatcher = request.getRequestDispatcher("/MainUser.jsp");
dispatcher.forward(request, response);
ARunner.jsp
<jsp:useBean id="a" class="view.A" scope="session"/>
<%
a.runFunction();
%>
MainUser.jsp
<jsp:useBean id="a" class="view.A" scope="session"/>
<%
System.out.println("S0:"+a.s0+" S1:"+a.s1); //should print S0:Hi S1:Hello, but printing S0:null S1:null
%>
giving code again to remove the typing errors. Please guide.