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SparseArray vs HashMap
...ted on heap by JVM.
They may vary depending on the specific JVM used.
The java.lang.instrument package contains some helpful methods for advanced operations like checking the size of an object with getObjectSize(Object objectToSize).
Extra info is available from the official Oracle documentation....
Which @NotNull Java annotation should I use?
... would like to avoid any reference to IDE, framework or any toolkit except Java itself.
This rules out:
android.support.annotation
edu.umd.cs.findbugs.annotations
org.eclipse.jdt.annotation
org.jetbrains.annotations
org.checkerframework.checker.nullness.qual
lombok.NonNull
Which leaves us with ...
How to initialize log4j properly?
...(Look for the "Default Initialization Procedure" section).
For example:
java -Dlog4j.configuration=customName ....
Will cause log4j to look for a file called customName on the classpath.
If you are having problems I find it helpful to turn on the log4j.debug:
-Dlog4j.debug
It will print to ...
How do you format the day of the month to say “11th”, “21st” or “23rd” (ordinal indicator)?
... in English. So, I suggest that if there's really no good solution in the Java world that is internationalization friendly that we start a project on, e.g., GitHub and create a good solution. Let me know if you're interested.
– Greg Mattes
Apr 7 '18 at 13:56
...
What is the difference between Serializable and Externalizable in Java?
What is the difference between Serializable and Externalizable in Java?
11 Answers
...
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...
Is there “Break on Exception” in IntelliJ?
...e the stack is walked looking for catch/finally blocks to execute.
TIP: Java tends to throw a lot of exceptions internally when loading classes, so this breaking on all exceptions can become quite tedious. The good news is that you can exclude certain types of exception using the condition field....
Why we should not use protected static in java
...going through this question Is there a way to override class variables in Java?
The first comment with 36 upvotes was:
8 ...
How to compare objects by multiple fields
...
With Java 8:
Comparator.comparing((Person p)->p.firstName)
.thenComparing(p->p.lastName)
.thenComparingInt(p->p.age);
If you have accessor methods:
Comparator.comparing(Person::getFirstName)
...
How do I change the language of moment.js?
I am trying to change the language of the date which is being set by moment.js. The default one is English, but I want to set the German language. These is what I tried:
...