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Detect if Android device has Internet connection
... at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1273) at java.net.InetAddress.lookupHostByName(InetAddress.java:431) ...
What encoding/code page is cmd.exe using?
...ąęźżńł
Russian абвгдеж эюя
CJK 你好
Here’s a Java program to print out the test file in a bunch of different
Unicode encodings. It could be in any programming language; it only prints
ASCII characters or encoded bytes to stdout.
import java.io.*;
public class Foo {
...
When should I use “this” in a class?
...a constructor.
Case 1: Using this to disambiguate variable references. In Java setter methods, we commonly pass in an argument with the same name as the private member variable we are attempting to set. We then assign the argument x to this.x. This makes it clear that you are assigning the value of...
Does application.yml support environment variables?
...override parameters, but does that also work for env variables? Ex.: nohup java -Xmx1024m -jar -Dspring.profiles.active="whatever". Is there a way to do that with env vars?
– Igor Donin
Feb 15 '19 at 12:06
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How to get a list of installed Jenkins plugins with name and version pair
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The Jenkins CLI supports listing all installed plugins:
java -jar jenkins-cli.jar -s http://localhost:8080/ list-plugins
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What are the differences between ArrayList and Vector?
... @Rei Exactly what he said: Multiple threads (docs.oracle.com/javase/tutorial/essential/concurrency/…)
– RecursiveExceptionException
Aug 8 '16 at 2:10
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Add and Remove Views in Android Dynamically?
...LinearLayout container view with just a Add new button.
Control
In the Java code, you'll add and remove row views into the container dynamically, using inflate, addView, removeView, etc. There are some visibility control for better UX in the stock Android app. You need add a TextWatcher for the ...
What is ActiveMQ used for - can we apply messaging concept using a Database?
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JMS, which is an API ActiveMQ implements, is an important cornerstone in Java Enterprise applications. This makes messages share a rather common format and semantic, which makes integration between different applications easier.
Of course, there are a lot of more detailed features that are only i...
Remove multiple keys from Map in efficient way?
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Just for the sake of completeness:
As guessed java.util.AbstractSet#removeAll really iterates over all entries, but with one little trick: It uses the iterator of the smaller collection:
if (size() <= collection.size()) {
Iterator<?> it = iterator();
wh...
Android studio using > 100% CPU at all times - no background processes appear to be running
...nly did so much, but I would still regularly see well over 100% for AS and java (over 300% when building!), and now it's in the single digits at rest. I'm on AS 3.4.1, fyi.
– pdub
May 24 '19 at 15:43
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