Why does my java code not compile [closed]

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The file compiles and works as expected but when I try to use it in another file it keeps saying when I attempt to compile. So clearly I don't know how to import code from another file correctly. How do I import the file for use within , I have read many explanations but they all require an IDE which I don't plan on using, I am using notepad++.

its the import statement on Centralize class, its looking for package. — Aditya Jain
– Aditya Jain, Commented Jun 3, 2014 at 14:32
Do you compile both files together or separately? Also, I don't see any package declaration in your ReadFile.java while you seem to expect one in Centralise (import ReadFile.*;). — Fradenger
– Fradenger, Commented Jun 3, 2014 at 14:34
What should I write on the import to be able to use ReadFile then? — user3701257
– user3701257, Commented Jun 3, 2014 at 14:38

lpratlong · Accepted Answer · 2014-06-03 14:44:41Z

3

You do import ReadFile.*; but ReadFile is not the package name but the class name. Package allows you to categorize your classes. Take a look at http://en.wikipedia.org/wiki/Java_package for more details.

Put your ReadFile.java into a package (for example: package org.your-company.io) then in the second class:

import org.your-company.io.ReadFile;

The instruction import somepackage.* indicates that you can use any classes from the package somepackage in your current class. For example, if I do:

import java.sql.*;

I will be able to call, in my code, directly:

Date dsql = ... // java.sql.Date
DriverManager driver = ... // java.sql.DriverManager
etc.

Edit

As Dukeling mentionned in a comment, if your classes are in the same "folder" (I mean package), you can remove your instruction import ReadFile.* which is wrong and useless.

edited Jun 3, 2014 at 14:44

answered Jun 3, 2014 at 14:32

lpratlong

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13 Comments

Anubian Noob Over a year ago

Good answer, but you should elaborate. What should he do? Why is that not working?

Bernhard Barker Over a year ago

... or if it's in the same package (which could be no package - which appears to currently be the case), there's no need to import it.

user3701257 Over a year ago

What is a package? I just have a folder with three files: ReadFile.java, ReadFile.class and Centralise.java. How would I use ReadFile within Centralise?

Anubian Noob Over a year ago

So a package is just a folder. If your files are in the same folder, you don't need any imports.

lpratlong Over a year ago

@user3701257 : You can take a look on Oracle tutorial which will explain you the package concept: docs.oracle.com/javase/tutorial/java/package

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