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Hashset vs Treeset
...sal.
None of these implementations are synchronized. That is if multiple threads access a set concurrently, and at least one of the threads modifies the set, it must be synchronized externally.
LinkedHashSet is in some sense intermediate between HashSet and TreeSet. Implemented as a hash table with ...
.NET - Dictionary locking vs. ConcurrentDictionary
...
A thread-safe collection vs. a non-threadsafe-collection can be looked upon in a different way.
Consider a store with no clerk, except at checkout. You have a ton of problems if people don't act responsibly. For instance, let's ...
How do I create a list of random numbers without duplicates?
..., 10)
With reference to your specific code example, you probably want to read all the lines from the file once and then select random lines from the saved list in memory. For example:
all_lines = f1.readlines()
for i in range(50):
lines = random.sample(all_lines, 40)
This way, you only need...
How to find out which processes are using swap space in Linux?
...ferenced by the process yet. In this case it's not necessary for the OS to read the complete binary from disk into memory, and thus the value of RES doesn't include this part of memory.
– Bart
Mar 5 '12 at 14:53
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Best way to make Django's login_required the default
...func, view_args, view_kwargs):
# No need to process URLs if user already logged in
if request.user.is_authenticated():
return None
# An exception match should immediately return None
for url in self.exceptions:
if url.match(request.path):
...
Does have to be in the of an HTML document?
...torically. If you care about the details of the spec and its history, keep reading.
No matter what the spec says, using style elements in the body does more-or-less work in all major browsers. However, it is considered a bad practice both because it violates spec and because it can cause undesirable...
Rails: What's a good way to validate links (URLs)?
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@jmccartie please read the entire post. If you care about the scheme, you should use the final code that includes also a type check, not just that line. You stopped reading before the end of the post.
– Simone Carletti
...
What is the difference between instanceof and Class.isAssignableFrom(…)?
...ference between instanceof operator and isAssignableFrom method in Class.
Read instanceof as “is this (the left part) the instance of this or any subclass of this (the right part)” and read x.getClass().isAssignableFrom(Y.class) as “Can I write X x = new Y()”. In other words, instanceof ope...
How do I revert all local changes in Git managed project to previous state?
...
and if you also want to clean your untracked files , read this stackoverflow.com/questions/61212/…
– Surasin Tancharoen
Nov 6 '12 at 9:32
9
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What is the easiest/best/most correct way to iterate through the characters of a string in Java?
... // process c
}
The first is probably faster, then 2nd is probably more readable.
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