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What is the difference between getFields and getDeclaredFields in Java reflection
...tween the getFields method and the getDeclaredFields method when using Java reflection.
4 Answers
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How to get the first element of the List or Set? [duplicate]
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See the javadoc
of List
list.get(0);
or Set
set.iterator().next();
and check the size before using the above methods by invoking isEmpty()
!list_or_set.isEmpty()
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java.sql.SQLException: - ORA-01000: maximum open cursors exceeded
...n extremely common error in Oracle database development. In the context of Java, it happens when the application attempts to open more ResultSets than there are configured cursors on a database instance.
Common causes are:
Configuration mistake
You have more threads in your application querying...
Java: int array initializes with nonzero elements
...new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f12317668%2fjava-int-array-initializes-with-nonzero-elements%23new-answer', 'question_page');
}
);
Post as a guest
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Collections.emptyMap() vs new HashMap()
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From Effective Java, Item #43 - "Return empty arrays or collections, not null" demonstrates returning an empty collection and perhaps even demonstrates using these emptyList(), emptySet(), and emptyMap() methods on the Collections class to...
Swing vs JavaFx for desktop applications [closed]
...ents.
Now SWT being somewhat old I would like to switch to either Swing or JavaFX. And I would like to hear your thoughts on three things.
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What's a good IDE for Python on Mac OS X? [closed]
...toring, and whose primary development language is Python. I come from the Java world, and have been a confident user of Eclipse for a good, long time. When not working in Java, I use emacs.
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Several ports (8005, 8080, 8009) required by Tomcat Server at localhost are already in use
...ipt. If in vain, close Eclipse and then open the task manager and kill all java and/or javaw processes.
Or if you actually installed it as a Windows service for some reason (this is namely intented for production and is unhelpful when you're just developing), open the services manager (Start > ...
'POCO' definition
...said it - Plain Old CLR Object (as opposed to the earlier POJO - Plain Old Java Object)
The POJO one came out of EJB, which required you to inherit from a specific parent class for things like value objects (what you get back from a query in an ORM or similar), so if you ever wanted to move from EJ...
How do I get the file extension of a file in Java?
...ly? It is a great library, full of utilities. Most of them will be part of Java8, like the great Guava Function.
– JeanValjean
Jun 12 '13 at 9:15
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