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Why when a constructor is annotated with @JsonCreator, its arguments must be annotated with @JsonPro
...object to the constructor.
It is not possible to access parameter names in Java using reflection - that's why you have to repeat this information in annotations.
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Compare two objects in Java with possible null values
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This is what Java internal code uses (on other compare methods):
public static boolean compare(String str1, String str2) {
return (str1 == null ? str2 == null : str1.equals(str2));
}
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Building vs. Compiling (Java)
... all the steps required to create a "deliverable" of your software. In the Java world, this typically includes:
Generating sources (sometimes).
Compiling sources.
Compiling test sources.
Executing tests (unit tests, integration tests, etc).
Packaging (into jar, war, ejb-jar, ear).
Running health c...
How to use classes from .jar files?
I read the Java tutorials on Sun for JAR files, but I still can't find a solution for my problem. I need to use a class from a jar file called jtwitter.jar, I downloaded the file, and tried executing it (I found out yesterday that .jar files can be executed by double clicking on them) and Vista gave...
C# equivalent to Java's charAt()?
I know we can use the charAt() method in Java get an individual character in a string by specifying its position. Is there an equivalent method in C#?
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Utils to read resource text file to String (Java) [closed]
...y the core library seems allergic to modeling real-life use cases. Look at Java 7's Files, and tell me why reading everything from a classpath resource wasn't included there? Or at least using a standardized 'filesystem'.
– Dilum Ranatunga
Mar 7 '14 at 18:36
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What is the difference between a.getClass() and A.class in Java?
In Java what pros/cons exist surrounding the choice to use a.getClass() or A.class ? Either can be used wherever a Class<?> is expected, but I imagine that there would be performance or other subtle benefits to using both in different circumstances (just like there are with Class.forName...
Java code To convert byte to Hexadecimal
...m.out.println(sb.toString());
// prints "FF 00 01 02 03 "
See also
java.util.Formatter syntax
%[flags][width]conversion
Flag '0' - The result will be zero-padded
Width 2
Conversion 'X' - The result is formatted as a hexadecimal integer, uppercase
Looking at the text of the questio...
Is there a way to access an iteration-counter in Java's for-each loop?
Is there a way in Java's for-each loop
15 Answers
15
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Choosing the best concurrency list in Java [closed]
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had better be List
The only List implementation in java.util.concurrent is CopyOnWriteArrayList. There's also the option of a synchronized list as Travis Webb mentions.
That said, are you sure you need it to be a List? There are a lot more options for concurrent Queues and M...