AW: Issue 27: Byte-Code compatibility of interfaces with andwithout Generics

["Barack, Ron" <ron.barack@sap.com>]

Oops, pasted the wrong client code, should be:

 

public static void main(String[] args) {

Lib lib = new Lib();

List a = lib.getStrings();

Iterator i = a.iterator();

while (i.hasNext()) {

System.out.println(i.next());

}

}

---

Von: Barack, Ron [mailto:ron.barack@sap.com]
Gesendet: Freitag, 23. Oktober 2009 12:53
An: sdo@lists.oasis-open.org
Betreff: [sdo] Issue 27: Byte-Code compatibility of interfaces with and without Generics

Hi Everyone,

 

I took an action item to evaluate whether adding generics to SDO 3 interfaces would require a recompile of applications that use SDO 2.1 interfaces.

 

To evaluate this, I wrote a small library and compiled it using Java 1.4.19.  The code looks like

 

public class Lib {

 

        public List getStrings() {

                List ret = new ArrayList();

                ret.add("nonGeneric");

                return ret;

        }

 

}

 

I then wrote a client program that uses the lib, also compiled against Java 1.4

 

        public List getStrings() {

                List ret = new ArrayList();

                ret.add("nonGeneric");

                return ret;

        }

 

Running the client with the library on the classpath produces the expected result (printing out "nonGeneric").

 

I then compiled the following code using Java 6

 

        public List<String> getStrings() {

                return Collections.singletonList("Hello");

        }

 

Modifying the classpath to include the Java 6 version instead of the Java 1.4 version of the library printed out "Hello", as expected.

 

I also tried some variations, eg, using interfaces, without noticing any problems.

 

From this, I conclude that adding generics to our interfaces will not require recompilation of code.

 

Best Regards,

Ron