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23 
24 
25 /* @test
26  * @bug 4705094 7197662
27  * @summary Checks if correct exception gets thrown when removing an
28  *          unregistered NodeChangeListener .
29  * @run main/othervm -Djava.util.prefs.userRoot=. RemoveUnregedListener
30  */
31 
32 import java.util.prefs.*;
33 import java.util.*;
34 
35 public class RemoveUnregedListener {
main(String[] args)36     public static void main(String[] args) throws Exception {
37         Preferences userRoot = null;
38         Preferences N1 = null;
39         NodeChangeListenerTestAdd ncl = new NodeChangeListenerTestAdd();
40         NodeChangeListenerTestAdd ncl2 = new NodeChangeListenerTestAdd();
41         NodeChangeListenerTestAdd ncl3 = new NodeChangeListenerTestAdd();
42         try {
43             userRoot = Preferences.userRoot();
44             N1 = userRoot.node("N1");
45             userRoot.flush();
46 
47             //add ncl nc2
48             N1.addNodeChangeListener(ncl);
49             N1.addNodeChangeListener(ncl2);
50             N1.removeNodeChangeListener(ncl3);
51             throw new RuntimeException();
52         } catch (IllegalArgumentException iae) {
53             System.out.println("Test Passed!");
54         } catch (Exception e) {
55             System.out.println("Test Failed");
56             throw e;
57         }
58     }
59 
60 }
61 class NodeChangeListenerTestAdd implements NodeChangeListener {
childAdded(NodeChangeEvent evt)62     public void childAdded(NodeChangeEvent evt) {}
childRemoved(NodeChangeEvent evt)63     public void childRemoved(NodeChangeEvent evt) {}
64 }
65