Ulf-
Very good. How what happens if you change the return type, or add a throws
clause, or change its access modifier (JLS 8.4.8.3)? In all three cases it
must be a compile-time error.
-Neal
On Tue, Oct 27, 2009 at 8:13 AM, Ulf Zibis <ulf.zi...@gmx.de> wrote:
> It works fine too.
> Is coded:
>
>
> public class MyClass1 {
> private final int value;
>
> public MyClass1(int value) {
> this.value = value;
> }
>
> public static int hashCode(Object key) {
> return 3;
> }
>
> // public static int hashCode(MyClass1 obj) {
>
> // return 3 * obj.value;
> // }
>
> public static void main(String... args) {
> MyClass1 c = new MyClass1(99);
> System.out.println(c.hashCode());
> System.out.println(hashCode(c));
> System.out.println(Object.hashCode(c)); // compile error if using
> official version of class Object
> }
> }
>
>
> -Ulf
>
>
> Am 27.10.2009 15:53, Neal Gafter schrieb:
>
>> Try adding
>>
>> public static hashCode(Object key) {
>> return 3;
>> }
>>
>> to MyClass. Such a class is broken by the proposed change.
>>
>> On Tue, Oct 27, 2009 at 2:49 AM, Ulf Zibis <ulf.zi...@gmx.de <mailto:
>> ulf.zi...@gmx.de>> wrote:
>>
>> Correction:
>>
>>
>> public class MyClass1 {
>> private final int value;
>>
>> public MyClass1(int value) {
>> this.value = value;
>> }
>>
>> public static int hashCode(MyClass1 obj) {
>> return 3 * obj.value;
>> }
>>
>> public static void main(String... args) {
>> MyClass1 c = new MyClass1(99);
>> System.out.println(c.hashCode());
>> System.out.println(hashCode(c));
>> System.out.println(Object.hashCode(c)); // compile error if
>> using official version of class Object
>> }
>> }
>>
>>
>> -Ulf
>>
>>
>>
>>
>
