Neal, thanks for your patience.
Yes, these are the arguments I understand.
Thanks a lot,
-Ulf
Am 27.10.2009 17:36, Neal Gafter schrieb:
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
<mailto: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> <mailto: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
