Compile java file with a package using Oracle JDK in ubuntu

Question

I have successfully compiled this file and saved.

class A
{
    public static void main(String[] args)
    {
        System.out.println("Hey!"); 
    }
}

using

javac a.java

java A

but when I compile this file:

package B;

class A
{
    public static void main(String[] args)
    {
        System.out.println("Hey!"); 
    }
}

now, again using the same commands it do compile but never run

javac a.java

java A       
// could not find or load main class

Please guide me the exact command for the terminal to run the file.

Note: The file is named "a.java".

java B.A - you should specify package

Maxim
– Maxim

2015-03-06 12:08:14 +00:00
Commented Mar 6, 2015 at 12:08 — Maxim
– Maxim, Commented Mar 6, 2015 at 12:08
might be helpful - package and folder names

harshtuna
– harshtuna

2015-03-06 13:04:49 +00:00
Commented Mar 6, 2015 at 13:04 — harshtuna
– harshtuna, Commented Mar 6, 2015 at 13:04

Eng.Fouad · Accepted Answer · 2015-03-06 12:08:18Z

2

You need to specify the fully-qualified name, i.e. packageName.ClassName:

java B.A

answered Mar 6, 2015 at 12:08

Eng.Fouad

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Comments

Jens · Accepted Answer · 2015-03-06 12:15:48Z

1

you have to change the directory to the directory wich contains the path 'B' (your package name) and than call java B.A

edited Mar 6, 2015 at 12:15

answered Mar 6, 2015 at 12:08

Jens

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8 Comments

Axel Over a year ago

... and A.java must be saved in the path ./B/A.java

Eng.Fouad Over a year ago

No, javac doesn't require the package name. java does.

Rohan Chauhan Over a year ago

I went to the directory, A.class is in the same location with a.java, thus again I am having the same error @Axel

Jens Over a year ago

@RohanChauhan you mist be in the directory that contans directory B and inside B must be A.class.

Rohan Chauhan Over a year ago

@Jens I dont have any directory inside my "java" directory in which I saved the a.java file. even when I use "cd B" its says, directory does not exist.

|

Rohan Chauhan · Accepted Answer · 2015-03-06 14:09:12Z

-1

As mentioned above, You need to specify the fully-qualified name, i.e. packageName.ClassName:

        >> javac a.java
        >> java B.A

But you need to create the directory named "packageName" yourself as jdk does not create one for you implicitly.

edited Mar 6, 2015 at 14:09

answered Mar 6, 2015 at 12:41

Rohan Chauhan

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1 Comment

harshtuna Over a year ago

with javac -d it does - see javac manual

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