regarding accessibility

[Gaurav Chikara]

If
I want to use a class with in same package
i can access it with no problem
but i give the package declaration in my current class which wants to access some other class then it says other class not found .Even if I try to give same package declaration in other class compiler gives same error
Can anyone give some suggwstion of how to do it?

[Art Metzer]

Hi, Gaurav.
I store my source (*.java) files in directory C:\Java. Therefore, I have added "C:\Java" to my CLASSPATH variable. If I want to create one Java package called "first", and another one called "second", then I need to create folders C:\Java\first and C:\Java\second.
This following code, I saved as C:\Java\first\Book.java. Notice the package statement:

package first;
public class Book {
    public int pages;
    public Book( int pages ) {
        this.pages = pages;
    }
    public void displayPages() {
        System.out.println( "Pages: " + pages );
    }
}

This next code, I saved as C:\Java\second\Library.java. Notice its package statement, and import statement, since it references Book, a class from another package:

package second;
import first.*;
public class Library {
    public static void main( String[] args ) {
        Book oreilly = new Book( 654 );
        oreilly.displayPages();
    }
}

To compile Book.java, I go to a command prompt and change the directory to C:\Java, then type
C:\Java>javac first\Book.java
And to compile Library.java,
C:\Java>javac second\Library.java
To run Library, I type
C:\Java>java second.Library
and get back
Pages: 654
To be able to directly invoke "java" and "javac", I had added C:\jdk1.3\bin to my PATH variable. This all assumes you are running Windows on your machine, which I don't know to be true.
Perhaps you forgot to use the import statement? Note, the import statement is not needed in Library.java if you specify the full path when you reference classes from other packages:

package second;
public class Library {
    public static void main( String[] args ) {
        first.Book oreilly = new first.Book( 654 );
        oreilly.displayPages();
    }
}

If I remove the "first" qualifier from this example, the compiler complains, saying that it "cannot resolve symbol," pointing to class "Book". Is this the kind of error you are getting, Gaurav?
Art

[Gaurav Chikara]

Thnkx a ton for clearing my concepts
u r great