Parent Directory | Revision Log | Patch
revision 1.9.2.2 by gnu_andrew, Tue Aug 2 20:12:30 2005 UTC | revision 1.9.2.3 by gnu_andrew, Tue Aug 16 16:22:37 2005 UTC | |
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# | Line 77 public class Observable | Line 77 public class Observable |
77 | */ | */ |
78 | public synchronized void addObserver(Observer observer) | public synchronized void addObserver(Observer observer) |
79 | { | { |
80 | if (observer == null) | |
81 | throw new NullPointerException("can't add null observer"); | |
82 | observers.add(observer); | observers.add(observer); |
83 | } | } |
84 |
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