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Example 6
shows the source code for the primary key class for the User EJB
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Must implement the equals() and hashCode() methods
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Each User EJB is uniquely identified by a login ID
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The login ID is a String
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The primary key class is essentially a wrapper around this String value
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java.lang.String could have been used directly as the primary key class, but
having a separate class is a slightly more clear design
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