Is it possible to import class file with default package?

Question

I have created a project and Hello.java file without package name

public class Hello {
   public String sayHello(){
      return "Say Hello";
   }
}

I exported this project into hello.jar.

Now I have created another project and Main.java to call sayHello() method. I added hello.jar in classpath but the below code showing me an error 'Hello cannot be resolved to a type'

 public class Main {
   public static void main(String[] args){
     Hello h=new Hello(); // Error
  }
}

http://stackoverflow.com/questions/2335211/what-is-the-default-package-in-which-my-classes-are-put-if-i-dont-specify-it — Vítor Marques, Feb 07 '14 at 14:51
That's the reason why Java have package naming convention. http://docs.oracle.com/javase/tutorial/java/package/namingpkgs.html — TheKojuEffect, Feb 07 '14 at 14:54
Related (duplicate): http://stackoverflow.com/q/283816/1065197 — Luiggi Mendoza, Feb 07 '14 at 14:58
duplicate http://stackoverflow.com/questions/2193226/how-to-import-a-class-from-default-package — Rajendra arora, Feb 07 '14 at 15:19

score 3 · Answer 1 · answered Feb 07 '14 at 14:56

It's not possible due to the fact that your Hello.java class needs to be inside a package stored in your JAR file to enable you to reference it. The structure of your JAR should at least be

hello.jar/packageName/Hello.java

after creating it like that it will be imported as

import packageName;

and you will be able to use classes from aformentioned package.

AmitG · Answer 2 · 2014-02-07T15:19:32.483

0

No. It is not possible.
Try giving package name to Hello java file and then create again jar and then write import statement in Main class file

package com;
public class Hello {
   public String sayHello(){
      return "Say Hello";
   }
}

and in Main class add following line

import com.Hello;
public class Main {
   public static void main(String[] args){
     Hello h=new Hello(); 
  }
}

edited Feb 07 '14 at 15:19

answered Feb 07 '14 at 14:54

AmitG

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While this is a solution for the problem, it doesn't directly explain the reasons of this problem. – Luiggi Mendoza Feb 07 '14 at 14:57
@ Luiggi Mendoza - I hope my answer added some value to OP. Can you please explain more on reason ? It will be value addition for me. – AmitG Feb 07 '14 at 15:14
Yes, check the link posted in my comment on OP's question. – Luiggi Mendoza Feb 07 '14 at 15:14

Is it possible to import class file with default package?

2 Answers2