Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-4703629

Sequencer.SyncMode's equals and hashCode do not work as expected

    XMLWordPrintable

    Details

      Description



      Name: vtR10009 Date: 06/17/2002


        Specification for the method Sequencer.SyncMode.equals() from the
      package javax.sound.midi reads:
      "Determines whether two objects are equal. Returns true if the objects
      are identical
         Overrides: equals in class Object"
        
        But reference implementation does not override Object.equals() method
      and fails for identical instances. The same is true for hashCode()
      method.

      This bug causes failure of new JCK test:
        api/javax_sound/midi/Sequencer/SyncMode/index.html#equalsHash
        
      To reproduce the bug run the following test with JDK build 1.4.1-beta-b14:
      ------------------------------- test.java --------------------------------
      import javax.sound.midi.*;

      public class test{
          public static void main(String args[]) {
              Sequencer.SyncMode sMode1 = new SMode("one");
              Sequencer.SyncMode sMode2 = new SMode("one");

              if (!sMode1.equals(sMode2)) {
                  System.err.println("equals() failed: expected true");
              }

              if (sMode1.hashCode() != sMode2.hashCode()) {
                  System.err.println("hashCodes are not equal: " + sMode1.hashCode()
                          + " " + sMode2.hashCode());
              }
          }
      }
      class SMode extends Sequencer.SyncMode {
          SMode(String name) {
              super(name);
          }
      }
      ---------------------------Logs-------------------------------------------
      novo101:templates$ javac test.java; java -showversion test
      java version "1.4.1-beta"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-beta-b14)
      Java HotSpot(TM) Client VM (build 1.4.1-beta-b14, mixed mode)

      equals() failed: expected true
      hashCodes are not equal: 31866429 16795905
      --------------------------------------------------------------------------
      ======================================================================

        Attachments

          Issue Links

            Activity

              People

              Assignee:
              fbomerssunw Florian Bomers (Inactive)
              Reporter:
              vitcsunw Vitc Vitc (Inactive)
              Votes:
              0 Vote for this issue
              Watchers:
              0 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved:
                Imported:
                Indexed: