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Does Java casting introduce overhead? Why?
... casting is not feasible, JVM must throw a ClassCastException.
Taken from JavaWorld: The cost of casting
Casting is used to convert between
types -- between reference types in
particular, for the type of casting
operation in which we're interested
here.
Upcast operations (also cal...
Set Django IntegerField by choices=… name
...n self.value
class Language(ChoiceEnum):
Python = 1
Ruby = 2
Java = 3
PHP = 4
Cpp = 5
# Uh oh
Language.Cpp._name_ = 'C++'
This is pretty much all. You can inherit the ChoiceEnum to create your own definitions and use them in a model definition like:
from django.db import mo...
Best practice for localization and globalization of strings and labels [closed]
...d library called localeplanet for Localization and Internationalization in JavaScript. Furthermore, I think it's native and has no dependencies to other libraries (e.g. jQuery)
Here's the website of library: http://www.localeplanet.com/
Also look at this article by Mozilla, you can find very go...
Getting random numbers in Java [duplicate]
I would like to get a random value between 1 to 50 in Java.
2 Answers
2
...
Why JSF calls getters multiple times
... return the already-prepared property and nothing more, exactly as per the Javabeans specification. They should not do any expensive DB/business logic at all. For that the bean's @PostConstruct and/or (action)listener methods should be used. They are executed only once at some point of request-based...
Is the != check thread safe?
... This is the bytecode for test()
ALOAD 0
GETFIELD test/Test1.a : Ljava/lang/Object;
ALOAD 0
GETFIELD test/Test1.a : Ljava/lang/Object;
IF_ACMPEQ L1
...
as we can see it loads field a to local vars twice, it's a non-atomic operation, if a was changed in between by another thre...
How to iterate over the files of a certain directory, in Java? [duplicate]
I want to process each file in a certain directory using Java.
4 Answers
4
...
Can I pass an array as arguments to a method with variable arguments in Java?
... is an Object[], so you can also call ezFormat(args) either way.
See also
Java language guide/varargs
Varargs gotchas #1: passing null
How varargs are resolved is quite complicated, and sometimes it does things that may surprise you.
Consider this example:
static void count(Object... objs) {
...
Is it possible in Java to access private fields via reflection [duplicate]
Is it possible in Java to access private field str via reflection?
For example to get value of this field.
3 Answers
...
Use tnsnames.ora in Oracle SQL Developer
...
@Hellday5432 - Yes that is correct. SQL Dev runs on Java which doesn't understand shortcuts; for example when opening a file we cannot use a shortcut to jump to a directory.
– Kent Pawar
Apr 9 '14 at 15:39
...