JSEditor is gone, but not really

JSEditor disappeared from Adobe Labs and is not only available inside of Flex Builder, but it turns out that the install site is still there and is actually the same version included in Flex Builder. You can add the install site: http://download.macromedia.com/pub/labs/jseclipse/autoinstall/site.xml and it will install. You will probably need to set JSEditor to be your editor for *.js

Maclipse Eclipse 3.4.1 Updates

Maclipse has been updated with all the changes merged in from Eclipse 3.4.1 finally. Links on the right, same install process applies.

Never hashCode on a mutable value.

public class Terrible {
 public static void main(String[] args) {
  HashSet people = new HashSet();
  Person originallyMike = new Person("Mike");
  people.add(originallyMike);
  System.out.println("Terrible.main: Contains Mike? " + people.contains(new Person("Mike")));
  System.out.println("Terrible.main: Changing stored name from Mike to Adam.");
  originallyMike._name = "Adam";
  System.out.println("Terrible.main: Contains Mike? " + people.contains(new Person("Mike")));
  System.out.println("Terrible.main: Contains Adam? " + people.contains(new Person("Adam")));

 }

 public static class Person {
  public String _name;

  public Person(String name) {
   _name = name;
  }

  @Override
  public int hashCode() {
   return _name.hashCode();
  }

  @Override
  public boolean equals(Object obj) {
   return obj instanceof Person && ((Person) obj)._name.equals(_name);
  }
 }
}

prints:

Terrible.main: Contains Mike? true
Terrible.main: Changing stored name from Mike to Adam.
Terrible.main: Contains Mike? false
Terrible.main: Contains Adam? false

HashSet uses the hashcode of your object to select the bucket for your object. If your hashCode changes, the object effectively disappears from the collection for the purposes of API calls like .contains(..). So do yourself a favor and never use a mutable value in your .hashCode (which also, incidentally, means that you can't use a mutable value in your .equals(..) since those two methods are required to be mutually consistent).