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EJB design: Composite Key in Entity Bean

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  1. Composite Key in Entity Bean (2 messages)

    Hi,
         Can anybody guide me in overriding the hashcode() method in my PK class, if my composite key consists of a String, int and a boolean variable.

    Thanks & Regards,
    Vishal
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    Threaded Messages (2)

  2. Composite Key in Entity Bean[ Go to top ]

    How about this? Just took it from weblogic samples !

    Let say the variables are: String strName, Boolean boolName, int intName



      private int hashCode = -1;

      public int hashCode(){

        if (hashCode == -1) {

          hashCode = strName.hashCode() ^ boolName.hashCode() ^ intName;
        }

        return hashCode;
      }

    Senthil.
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  3. Composite Key in Entity Bean[ Go to top ]

    Hi Senthil,
          Thanks for your immediate response. This approach looks fine(except the fact that I should wrap my boolean variable to Boolean object in order to get the hashcode out of it). But is there not a concrete step of doing this ? In most of the sample examples, I could see the varibles getting concatinated and then taken the hashcode out of it.
    eg. (intName + strName + boolName).hashCode()
          Is this also a right approach ? This returns a different hashcode if the sequence of the variables concatinated is changed.
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