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Easy Learn Java: Programming Articles, Examples and Tips - Page 22


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Question: Some packages use capital letters in name and some low case? I read th

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Question: Some packages use capital letters in name and some low case? I read they must be low case...

Answer: Before Java 2 (1.2) the com, org, edu, etc. extensions were capitalized on Java packages. This was changed in Java 2.
Now package name is in low case.

***************************************
Our older tips: March 22, 2001 - Oktober 21, 2002 read here.
All published and not published on site tips you can find here



6 comments | Printer Friendly Page  Send to a Friend | Score: 1
Posted by jalex on Wednesday, February 19, 2003 (00:00:00) (4100 reads)

Question: Quite often I see that programmers use full name of class in a program

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Question: Quite often I see that programmers use full name of class in a program. For example like this:

java.util.Vector vect = new Vector();

I do not like such long lines, they are not so nice! Is not it easier to use the "import" in the beginning of program:

import java.util.*;

and then: Vector vect = new Vector(); ?

Answer: By using full class name in a program a programmer avoids names collision situation - a case when you could have your own Vector class in your package:


com.mypack.utilities.*

For example you have:

import com.mypack.utilities.*;
import java.util.*;

Compiler will not understand which Vector class you reffer in the line below:

Vector vect = new Vector();
The usage of full class name makes the situation clear.
***************************************
Our older tips: March 22, 2001 - Oktober 21, 2002 read here.
All published and not published on site tips you can find here


673 bytes more | 26 comments | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Tuesday, February 18, 2003 (00:00:00) (3732 reads)

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