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In log4j, does checking isDebugEnabled before logging improve performance?
...ensive computation of the log message when it involves invocation of the toString() methods of various objects and concatenating the results.
In the given example, the log message is a constant string, so letting the logger discard it is just as efficient as checking whether the logger is enabled, ...
Create ArrayList from array
...d its of() and copyOf() factory methods (elements can't be null):
List<String> il = ImmutableList.of("string", "elements"); // from varargs
List<String> il = ImmutableList.copyOf(aStringArray); // from array
For A Mutable List
Use the Lists class and its newArrayList() factory ...
How to use hex color values
... a combination of the previous methods. There is absolutely no need to use strings.
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Javascript object Vs JSON
...nderstand the basic differences clearly between Javascript object and JSON string.
5 Answers
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How can I loop through a C++ map of maps?
...+11 - you can use a ranged based for loop and simply do:
std::map<std::string, std::map<std::string, std::string>> mymap;
for(auto const &ent1 : mymap) {
// ent1.first is the first key
for(auto const &ent2 : ent1.second) {
// ent2.first is the second key
// ent2.sec...
How to use an existing database with an Android application [duplicate]
...trying this code, please find this line in the below code:
private static String DB_NAME ="YourDbName"; // Database name
DB_NAME here is the name of your database. It is assumed that you have a copy of the database in the assets folder, so for example, if your database name is ordersDB, then the ...
How to respond with HTTP 400 error in a Spring MVC @ResponseBody method returning String?
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What if you are passing something other than a string back? As in a POJO or other object?
– mrshickadance
Nov 18 '14 at 16:28
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How do you return a JSON object from a Java Servlet
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I do exactly what you suggest (return a String).
You might consider setting the MIME type to indicate you're returning JSON, though (according to this other stackoverflow post it's "application/json").
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Empty arrays seem to equal true and false at the same time
...are values of this object and the primitive false value. Internally, arr.toString() is called, which returns an empty string "".
This is because toString called on Array returns Array.join(), and empty string is one of falsy values in JavaScript.
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Guava equivalent for IOUtils.toString(InputStream)
Apache Commons IO has a nice convenience method IOUtils.toString() to read an InputStream to a String.
9 Answers
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