Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Thread dump: jstack jvm_pid >
Memory dump: jmap -dump:live,format=b,file=
Heap status: jmap -heap jvm_pid
GC status: jstat …
Use == (instead of the method Object.equals) to compare objects is a common and tricky mistake for beginner.
You cannot define an abstract static method. This is because "abstract" means that no functionality is implemented while "static" means that functionality exists even there is no object. The two conflict in concept.
Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
JPype is easy and intuitive to use. It is the most popular Java interface for Python currently.
import os
import sys
from pathlib import Path
import jpype
jpype.addClassPath("/path/to …Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
$HOME/.m2
maven: shade plugin, scala compile plugin, exclude manifest files, ...
import as maven project ...
find an updated version of scala archetype for maven
mvn package
mvn clean …Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
sudo add-apt-repository ppa:webupd8team/java
If you are behind a firewall and has to communicate to the internal via a proxy,
you can first export the environment vairables http_proxy and https_proxy …
Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Oracel Java Tutorial on Collections
You can point an element of Array or ArrayList to null,
but remember that a null reference cannot invoke any method.
For example,
if you …