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How should equals and hashcode be implemented when using JPA and Hibernate
... Cat {
...
public boolean equals(Object other) {
//Basic test / class cast
return this.catId==other.catId;
}
public int hashCode() {
int result;
return 3*this.catId; //any primenumber
}
}
Python integer division yields float
...=int ? What should I do, is there a new division operator or must I always cast?
5 Answers
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How do I use DateTime.TryParse with a Nullable?
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Why are you casting a DateTime to a DateTime? You don't need to recased d2 before passing it into the TryParse.
– Aaron Powell
Oct 31 '08 at 21:48
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How to convert an array into an object using stdClass() [duplicate]
...this solution json_decode(json_encode($clasa)) over just using (object) to cast the array into an object is that the latter doesn't do it recursively so any inner arrays remain arrays.
– racl101
Jan 21 '15 at 18:20
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Find size of object instance in bytes in c#
...array for data and an unmanaged proxy class to access values using pointer casting if size matters, note that would be non-aligned memory so on old computers is gonna be slow but HUGE datasets on MODERN RAM is gonna be considerably faster, as minimizing the size to read from RAM is gonna be a bigger...
how to pass an integer as ConverterParameter?
...ueConverter.Convert()'s "parameter" parameter is object. You still have to cast/parse it...
– Dan J
Aug 2 '11 at 16:11
6
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How to see if an object is an array without using reflection?
...e value of the RelationalExpression is not null and the reference could be cast to the ReferenceType without raising a ClassCastException. Otherwise the result is false.
That means you can do something like this:
Object o = new int[] { 1,2 };
System.out.println(o instanceof int[]); // prints "true"...
Why is it string.join(list) instead of list.join(string)?
...you have a tuple of strings? If this were a list method, you would have to cast every such iterator of strings as a list before you could join the elements into a single string! For example:
some_strings = ('foo', 'bar', 'baz')
Let's roll our own list join method:
class OurList(list):
def j...
AWS MySQL RDS vs AWS DynamoDB [closed]
...ation and dynamo. Further, point number 6 is misnamed to the point that it casts a doubt on DynamoDB's "integrity" - that might not be the intention...
– doles
Feb 10 '17 at 15:41
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How to use shared memory with Linux in C
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Why are you casting 0 into a void* instead of using NULL ?
– Clément Péau
Mar 28 '17 at 15:45
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