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With Spring can I make an optional path variable?
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If you are using Spring 4.1 and Java 8 you can use java.util.Optional which is supported in @RequestParam, @PathVariable, @RequestHeader and @MatrixVariable in Spring MVC -
@RequestMapping(value = {"/json/{type}", "/json" }, method = RequestMethod.GET)
pub...
How to have the formatter wrap code with IntelliJ?
...rgin is not exceeded" option is in File / Settings / Editor / Code Style / Java / Wrapping and Braces / Keep when reformatting
– Aaron
Jan 3 '16 at 8:11
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Is it wrong to place the tag after the tag?
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<html>
....
<body>
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<script type="text/javascript" src="theJs.js"></script>
</body>
</html>
share
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improve this answer
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Get the name of an object's type
Is there a JavaScript equivalent of Java 's class.getName() ?
20 Answers
20
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Jackson serialization: ignore empty values (or null)
...-gson/], where these null fields will be automatically removed.
SampleDTO.java
public class SampleDTO {
String username;
String email;
String password;
String birthday;
String coinsPackage;
String coins;
String transactionId;
boolean isLoggedIn;
// getters/set...
Remove Item from ArrayList
...o use ListIterator remove() method for removing objects from Collection in Java, because there may be chance that another thread is modifying the same collection and could leads to ConcurrentModificationException.
– Min2
Jun 21 '18 at 3:05
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Simple regular expression for a decimal with a precision of 2
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For Java users: the decimal shouldn't be escaped.
– user1382306
Jan 26 '14 at 22:10
3
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Why is printing “B” dramatically slower than printing “#”?
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I performed tests on Eclipse vs Netbeans 8.0.2, both with Java version 1.8;
I used System.nanoTime() for measurements.
Eclipse:
I got the same time on both cases - around 1.564 seconds.
Netbeans:
Using "#": 1.536 seconds
Using "B": 44.164 seconds
So, it looks like Netbeans has bad...
How can I perform a culture-sensitive “starts-with” operation from the middle of a string?
... - the ToUpper method
doesn't turn ß into SS.
For example this works in Java (and even in Javascript), given string that is in Normal Form C:
//Poor man's case folding.
//There are some edge cases where this doesn't work
public static String toCaseFold( String input, Locale cultureInfo ) {
r...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
... arrives. Instead of implementing the event listeners with the traditional Java programming in Android, programmers can simply accomplish this by dragging a block and adding corresponding actions they want when a specific event occurs.
Unlike the traditional text-based programming, MIT App Inventor...