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How do you find all subclasses of a given class in Java?
...iven interface) in Java?
As of now, I have a method to do this, but I find it quite inefficient (to say the least).
The method is:
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Why is an int in OCaml only 31 bits?
Haven't seen this "feature" anywhere else. I know that the 32nd bit is used for garbage collection. But why is it that way only for ints and not for the other basic types?
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Can I catch multiple Java exceptions in the same catch clause?
...tch both ExceptionA and ExceptionB in the same block if ExceptionB is inherited, either directly or indirectly, from ExceptionA. The compiler will complain:
Alternatives in a multi-catch statement cannot be related by subclassing
Alternative ExceptionB is a subclass of alternative ExceptionA
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PersistentObjectException: detached entity passed to persist thrown by JPA and Hibernate
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This is a typical bidirectional consistency problem. It is well discussed in this link as well as this link.
As per the articles in the previous 2 links you need to fix your setters in both sides of the bidirectional relationship. An example setter for the One side is in this ...
Iterate through a HashMap [duplicate]
What's the best way to iterate over the items in a HashMap ?
7 Answers
7
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Best way to simulate “group by” from bash?
...addresses | uniq -c
This will print the count first, but other than that it should be exactly what you want.
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Career day in kindergarten: how to demonstrate programming in 20 minutes? [closed]
I was invited to the kindergarten group of my elder daughter to talk and answer the kids' questions about my profession. There are 26 kids of age 4-6 in the group, plus 3 teachers who are fairly scared of anything related to programming and IT themselves, but bold enough to learn new tricks. I would...
HTML input - name vs. id [duplicate]
...aScript and PHP can see the URL there are workarounds
Is referenced in JS with getElementsByName()
Shares the same namespace as the id attribute
Must begin with a letter
According to specs is case sensitive, but most modern browsers don't seem to follow this
Used on form elements to submit informati...
Is it a bad practice to catch Throwable?
Is it a bad practice to catch Throwable ?
14 Answers
14
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Commands out of sync; you can't run this command now
...ecause mysqli uses unbuffered queries by default (for prepared statements; it's the opposite for vanilla mysql_query). You can either fetch the first one into an array and loop through that, or tell mysqli to buffer the queries (using $stmt->store_result()).
See here for details.
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