Calling methods from within another class.

From: James via JavaKB.com (forum_at_JavaKB.com)
Date: 03/28/05 

Date: Mon, 28 Mar 2005 20:58:32 GMT

Hi,

I'm setting up two servlet classes:

issueOptions() (in issueOptions.java) and menuUI() (in menuUI.java).

Both are in the same package: menu.

menuUI has a method inside called issueOverview().

I want to call and execute the issueOverview() method from the issueOptions
class, but how do I do this? I have been trying to do by creating an
instance of the menuUI class, but I cannot be doing correctly. I have
posted the following code (which I hope is useful) and the error produced
upon compiling:

menuUI.java
~~~~~~~~~~~
package menu;

import java.io.*;
import java.util.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.text.DateFormat.*;
import java.util.Date.*;

public class menuUI extends HttpServlet {
    //Initialize global variables
....
.....
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        try {
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            connection = DriverManager.getConnection(URL, "", "");
     ....
     ....
     ....
     }
    }

    public void doPost(HttpServletRequest request, HttpServletResponse
response) throws
                ServletException, IOException {

...
...
}

    public void issueOverview(HttpServletRequest
request,HttpServletResponse response, String issueNo)
                         throws ServletException, IOException {
...
...
   }

}

issueOptions.java
~~~~~~~~~~~~~~~~~
package menu;

import java.io.*;
import java.util.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class issueOptions extends HttpServlet {
    //Initialize global variables
  private Connection connection = null;
  private Statement statement = null;
  private String query = null;
  private int result;
  private ResultSet rs = null;
  private String URL = "jdbc:odbc:myDB";
  private menuUI theMenu;

public issueOptions(){
          theMenu = new menuUI();
  }

    public void init(ServletConfig config) throws ServletException {
        super.init(config);

        try {
.....
.......
}

    public void doPost(HttpServletRequest request, HttpServletResponse
response) throws
                ServletException, IOException {
.......
.......
}

      public void addComment(HttpServletRequest request,
HttpServletResponse response, String issueNo, String raisedBy, String
commentTitle, String commentDescription) throws ServletException,
IOException {
...
....
.....
   if (success = false) {
       out.println("<head><title>Comment Details NOT
Submitted</title></head>");
       out.println("<body>");
       out.println("An error has occurred!");
       out.println("<br>The details could not be submitted!");
       out.println("<pre><a href=/ILS/addComment.html>Try Again</a></pre>");
       out.println("</body>");
       out.println("</html>");
       out.close();
   }

   else {
          theMenu.issueOverview(request, response, issueNo);
        }
   }

}

JAVAC ERRORS
~~~~~~~~~~~~
issueOptions.java:22: cannot find symbol
symbol : class menuUI
location: class menu.issueOptions
  private menuUI theMenu;
          ^
issueOptions.java:26: cannot find symbol
symbol : class menuUI
location: class menu.issueOptions
          theMenu = new menuUI();
                        ^
2 errors 

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