Solved

Basic java question - Calling a class from a class

Posted on 2011-09-07
9
178 Views
Last Modified: 2012-05-12
I am writing class 1 and it sets in directory A.  With in class 1 I need to call class 2 and it sets in directory B

I am not sure how to specify in my class 1 to run class 2
0
Comment
Question by:jkteater
  • 8
9 Comments
 
LVL 47

Expert Comment

by:for_yan
ID: 36498359

You need to make sure hwne you compile and execute Class1 that you have
the directory where you have Class2 present in the classpath
0
 
LVL 47

Expert Comment

by:for_yan
ID: 36498366
CLASSPATH can be defined either by enrinement variable CLASSPATH
or using swich -cp before your class name  on command line - both for javac and for java
0
 
LVL 47

Expert Comment

by:for_yan
ID: 36498386

Make sure that neither Class1 nor Class2 have package statenemnet on top.
If so then if your defaiult folder is A
then in the command you can say:

C:\path\A> javac -cp .;c:\foldres_path\B  Class1.java

and the same during execution:

C:\path\A>java -cp .;c:\foldres_path\B  Class1
 
I assume that you are on Windows

0
MS Dynamics Made Instantly Simpler

Make Your Microsoft Dynamics Investment Count  & Drastically Decrease Training Time by Providing Intuitive Step-By-Step WalkThru Tutorials.

 

Author Comment

by:jkteater
ID: 36498426
The classpath is ok - I am having problems with the code

 public Object execute(final ExecutionEvent event) throws ExecutionException {
      
      
      Display.getDefault().asyncExec(new Runnable() {
         public void run() {
            ediBaseDialog();   <===  ediBaseDialog is a class sitting in dir B        
         }
      });
/*

Open in new window


I get a  error saying that ediBaseDialog is undefined
0
 
LVL 47

Accepted Solution

by:
for_yan earned 125 total points
ID: 36498430
If you have package statement in Class2 then it should be located in certain folder relative to the folder
mentioned in CLASSPATH - and the relative location is determined by package

So if say Class2 satrts with the line

package com.company.pack;

then you should place you Class2.java into the folder

c:\foldres_path\B\com\company\pack

(assuming you are using the same command as above).
0
 
LVL 47

Expert Comment

by:for_yan
ID: 36498439

 ediBaseDialog();   - is not a class - it is a method - is irt a static maethod or not ?
0
 
LVL 47

Expert Comment

by:for_yan
ID: 36498449


if it is staic method then you should clali this way:

Class2.ediBaseDialog();  

Class2 is obviously the name of your class conatining this static method
0
 
LVL 47

Expert Comment

by:for_yan
ID: 36498455
In this case if Class2 will be accessible through CLASSPATH as I mentioned above it will execute static method of Class2
0
 
LVL 47

Expert Comment

by:for_yan
ID: 36498480
If
ediBaseDialog();  
is an instance metyjhod, then you first need to create instance of Class2, say tlike this

Class2 cl2 = new Class2();
cl2. ediBaseDialog();  

But in this case maybe you need to use some other constructore - maybe it requires some parameters,
but anyway if it is an instance method of Class2, then you first have to create an instance of the Class2 object
and then invokke method on that instance
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
spring jars download 1 54
String array comparison 4 46
ejb mdb examples 1 21
Delphi Firemonkey: if the Sms contain special characters it won't send it 3 65
Java Flight Recorder and Java Mission Control together create a complete tool chain to continuously collect low level and detailed runtime information enabling after-the-fact incident analysis. Java Flight Recorder is a profiling and event collectio…
Introduction This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
Viewers will learn about basic arrays, how to declare them, and how to use them. Introduction and definition: Declare an array and cover the syntax of declaring them: Initialize every index in the created array: Example/Features of a basic arr…
The viewer will learn how to implement Singleton Design Pattern in Java.

730 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question