You explain at https://docs.jboss.org/hibernate/orm/5.0/manual/en-US/html/ch04.html#persistent-classes-equalshashcode how to write equals and hashcode.
Current java versions allow to implement these methods in much shorter and cleaner code using . {{ java.util.Objects.equals() }} and {{ java.util.Objects.hash() }} .
E.g.
{code:java}
@Override
public boolean equals(Object rhs) {
if (this == rhs)
return true;
/**
* A proxy class does not compare well. So we first have to get the real
* class
*/
if (rhs == null || Hibernate.getClass(this) != Hibernate.getClass(rhs))
return false;
MyClass that = (MyClass ) rhs;
if (!java.util.Objects.equals(fieldname, that.fieldname))
return false;
return true;
}
@Override
public int hashCode() {
return java.util.Objects.hash(fieldname);
}
{code}
|
|