Making D Lang More easy.

[Matthew Ong]

On 5/12/2011 2:23 AM, Walter Bright wrote:
Hi Walter,
>
> Not sure what you mean by more complex than Java. The order of imports
> in D is not important.

Hmm... Someone more experience in Java and also D might want to update 
this URL and help some new Java To D developer to figure out the import 
subtle differences
http://prowiki.org/wiki4d/wiki.cgi?JavaToD

 > But it is quite common in Java to import >only
 >exactly what you use, though I think that that's at least partially to 
 >avoid
 >symbol clashes, and D doesn't work quite the same way in that regard.
Yes. I agrees with Jonathan. Please take a look at these 2 blocks bellow.

In Java,

import java.util.*; // for LinkedList / HashMap
import java.sql.*;  // for JDBC API

class MyTable{
   void read(){
       ... // Obtain ResultSet
       Date date=rs.getDate(1); // this line will always cause 
compilation error because both java.util & java.sql package has Date class.

   }

   void readFixed(){
       ... // Obtain ResultSet
       java.util.Date date=rs.getDate(1); // this will fixed the 
compilation error while still keep both the imports.
   }
}

http://www.digitalmars.com/d/2.0/module.html

module A;
void foo();
void bar();
------------------------
module B;
void foo();
void bar();
------------------------
module C;
import A;
void foo();

// .... Due to the fact that there is only one D source file per module, 
and from what I can see, there are normally many 
functions/classes/others... in between here. The user of that function 
might have forgotten about the foo defined above.

void test()
{
   // the line below is really >dangerous< and might have been missed 
out because it is NOT flagged. Such things are always flag within Java 
and also google Go and maybe c/c++. Hopefully this will be flag as 
compilation erro to others kind of syntax.
   foo(); // C.foo() is called, it is found before imports are searched
   bar(); // A.bar() is called, since imports are searched
}


-- 
Matthew Ong
email: ongbp at yahoo.com