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Why are `private val` and `private final val` different?
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So, this is just a guess, but it was a perennial annoyance in Java that final static variables with a literal on the right-hand side get inlined into bytecode as constants. That engenders a performance benefit sure, but it causes binary compatibility of the definition to break if the "c...
Best practice for creating millions of small temporary objects
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Run the application with verbose garbage collection:
java -verbose:gc
And it will tell you when it collects. There would be two types of sweeps, a fast and a full sweep.
[GC 325407K->83000K(776768K), 0.2300771 secs]
[GC 325816K->83372K(776768K), 0.2454258 secs]
[Full G...
Should I use an exception specifier in C++?
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@curiousguy. That's how Java does it because it checks are enforced at compile time. C++ are runtime checks. So: Guarantee that functions will only throw listed exceptions (possibly none). Not true. It only guarantees that if the function does throw...
JVM option -Xss - What does it do exactly?
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Each thread in a Java application has its own stack. The stack is used to hold return addresses, function/method call arguments, etc. So if a thread tends to process large structures via recursive algorithms, it may need a large stack for all...
Can I use Class.newInstance() with constructor arguments?
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Seems like the answer is "no" for Java 1.1
– Jim
Jul 28 '16 at 11:13
I have p...
Eclipse error: “The import XXX cannot be resolved”
... also for me; it is not an hibernate project, but a libGdx one, calling my java imports and not jars. Same wondering of @SabreRunner, and also: there is a bug somewhere in the environment tools?
– Zac
Jul 19 '14 at 10:00
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Parcelable encountered IOException writing serializable object getactivity()
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Caused by: java.io.NotSerializableException: com.resources.student_list.DSLL$DNode
Your DSLL class appears to have a DNode static inner class, and DNode is not Serializable.
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Regular expression: find spaces (tabs/space) but not newlines
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Good point. Java's \h (introduced in Java 8) does include \u3000, but \s does not, unless you set UNICODE_CHARACTER_CLASS mode (introduced in Java 7).
– Alan Moore
Apr 19 '16 at 21:46
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Typical .gitignore file for an Android app
...e:
# built application files
*.apk
*.ap_
# files for the dex VM
*.dex
# Java class files
*.class
# generated files
bin/
gen/
# Local configuration file (sdk path, etc)
local.properties
with Eclipse.gitignore:
*.pydevproject
.project
.metadata
bin/**
tmp/**
tmp/**/*
*.tmp
*.bak
*.swp
*~.nib
l...
What is the gain from declaring a method as static
... a first class Function concept that allows that, so static is not needed. Java 8 will have lambda expressions integrated, so we are moving into this direction already.
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