-JSR245のMLへ投稿

JSR245のMLへ投稿しました。昨日の議論です。

 ...（長文なので前略）
 I suggest that Using only interfaces(this is Eclipse's way), see below.

API2.1 --------------------------------------------------------------------
public interface InterfaceAPI21 {
    void someInterfaceMethod();
}

API2.2---------------------------------------------------------------------
public interface InterfaceAPI22 {
    /*or InterfaceAPI22 extends InterfaceAPI21*/
    void anotherInterfaceMethod();
}


Impl2.1--------------------------------------------------------------------
public class InterfaceAPI21Impl implements InterfaceAPI21 {
    public void someInterfaceMethod() {
      // implement here
    }
}

Impl2.2--------------------------------------------------------------------
[case1 all new implementation]
public class InterfaceAPI22Impl implements InterfaceAPI21, InterfaceAPI22 {
    public void someInterfaceMethod() {
      // implement here
    }
    public void anotherInterfaceMethod() {
      // implement here
    }
}

[case 2 using old implementation]
public class InterfaceAPI22Impl extends InterfaceAPI21Impl 
        implements InterfaceAPI22 {
    public void anotherInterfaceMethod() {
      // implement here
    }
}

Container2.2's internal use--------------------------------------------------
[case1 needs backward compatible]
public void container22Code(InterfaceAPI21 api21) {
    api21.someInterfaceMethod();
    if(api21 instanceof InterfaceAPI22) {
        ((InterfaceAPI22)api21).anotherInterfaceMethod();
    }
}

[case2 all new implmentation]
public void container22Code(InterfaceAPI22 api22) {
    api22.someInterfaceMethod();
    api22.anotherInterfaceMethod();
}























































































































































-











































































 If you want to add new methods, Define new Interface. I think that this is
safe and more extensible.