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JMS Topic vs Queues
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That means a topic is appropriate. A queue means a message goes to one and only one possible subscriber. A topic goes to each and every subscriber.
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What is the difference between JOIN and UNION?
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Joins and Unions can be used to combine data from one or more tables. The difference lies in how the data is combined.
In simple terms, joins combine data into new columns. If two tables are joined together, then the data from the first table is shown in one set of column...
What do 3 dots next to a parameter type mean in Java?
...ny of the following:
myMethod(); // Likely useless, but possible
myMethod("one", "two", "three");
myMethod("solo");
myMethod(new String[]{"a", "b", "c"});
Important Note: The argument(s) passed in this way is always an array - even if there's just one. Make sure you treat it that way in the method ...
What is the memory consumption of an object in Java?
Is the memory space consumed by one object with 100 attributes the same as that of 100 objects, with one attribute each?
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Select all columns except one in MySQL?
...lect statement to get all of the columns from a certain MySQL table except one. Is there a simple way to do this?
30 Answer...
Ruby capitalize every word first letter
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try this:
puts 'one TWO three foUR'.split.map(&:capitalize).join(' ')
#=> One Two Three Four
or
puts 'one TWO three foUR'.split.map(&:capitalize)*' '
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One-liner to take some properties from object in ES 6
How one can write a function, which takes only few attributes in most-compact way in ES6?
11 Answers
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What happens when a duplicate key is put into a HashMap?
...Java returns any previous value associated with the given key (or null if none present), so you can determine what was there and maintain a reference if necessary.
More information here: HashMap Doc
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When should we use mutex and when should we use semaphore
...p till some other thread tells you to wake up. Semaphore 'down' happens in one thread (producer) and semaphore 'up' (for same semaphore) happens in another thread (consumer)
e.g.: In producer-consumer problem, producer wants to sleep till at least one buffer slot is empty - only the consumer thread ...
How to move files from one git repo to another (not a clone), preserving history
...ed) subset of the files, and this by definition changes the hashes. Since none of the standard commands (e.g. pull) rewrite history, there's no way you could use them to accomplish this.
You could refine the details, of course - some of your cloning and branching wasn't strictly necessary - but the...