大约有 7,486 项符合查询结果（耗时：0.0275秒） [XML]
CharSequence VS String in Java?
...
But keep in mind this caveat from the CharSequence javadoc: This interface does not refine the general contracts of the equals and hashCode methods. The result of comparing two objects that implement CharSequence is therefore, in general, undefined. Each object may be impleme...
How to use MDC with thread pools?
...f things that need to be processed in the background. For that we use the java.concurrent.ThreadPoolExecutor and java.util.Timer classes along with some self-rolled async execution services. All these services manage their own thread pool.
...
Why generate long serialVersionUID instead of a simple 1L?
...now should be compatible but which causes serialization to break.
See the Java Serialization Spec for more details.
share
|
improve this answer
|
follow
|
...
Task not serializable: java.io.NotSerializableException when calling function outside closure only o
...}
object NOTworking extends App {
new Test().doIT
}
class Test extends java.io.Serializable {
val rddList = Spark.ctx.parallelize(List(1,2,3))
def doIT() = {
val after = rddList.map(someFunc)
after.collect().foreach(println)
}
def someFunc(a: Int) = a + 1
}
or you make someF...
How to call getClass() from a static method in Java?
...()
Check the boxes to reformat and shorten FQ names.
Change the context to Java: declaration.
Now if you type log<tab> it'll automatically expand to
private static final Logger logger = LoggerFactory.getLogger(ClassName.class);
And automatically reformat and optimize the imports for you....
What is the standard exception to throw in Java for not supported/implemented operations?
...
java.lang.UnsupportedOperationException
Thrown to indicate that the requested operation is not supported.
share
|
impr...
Java: Literal percent sign in printf statement
I'm trying to add an actual percent sign into a printf statement in Java and I'm getting the error:
3 Answers
...
Java: possible to line break in a properties file?
Is it possible to continue a long string on the next line in a Java properties file?
3 Answers
...
ByteBuffer.allocate() vs. ByteBuffer.allocateDirect()
...
Ron Hitches in his excellent book Java NIO seems to offer what I thought could be a good answer to your question:
Operating systems perform I/O
operations on memory areas. These
memory areas, as far as the operating
system is concerned, are contiguo...
How to check whether a given string is valid JSON in Java
How do I validate a JSON string in Java? Or could I parse it using regular expressions?
19 Answers
...