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Synchronization vs Lock
java.util.concurrent API provides a class called as Lock , which would basically serialize the control in order to access the critical resource. It gives method such as park() and unpark() .
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Spring Boot application as a Service
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What follows is the easiest way to install a Java application as system service in Linux.
Let's assume you are using systemd (which any modern distro nowadays does):
Firstly, create a service file in /etc/systemd/system named e.g. javaservice.service with this content...
How to format Joda-Time DateTime to only mm/dd/yyyy?
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Note that in JAVA SE 8 a new java.time (JSR-310) package was introduced. This replaces Joda time, Joda users are advised to migrate. For the JAVA SE ≥ 8 way of formatting date and time, see below.
Joda time
Create a DateTimeFormatter us...
Java: random long number in 0
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Starting from Java 7 (or Android API Level 21 = 5.0+) you could directly use ThreadLocalRandom.current().nextLong(n) (for 0 ≤ x < n) and ThreadLocalRandom.current().nextLong(m, n) (for m ≤ x < n). See @Alex's answer for detail.
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Java: Calling a super method which calls an overridden method
...even achieve the desired effect using Reflection (see the documentation of java.lang.reflect.Method.invoke(Object, Object...)).
[EDIT] There still seems to be some confusion. Let me try a different explanation.
When you invoke foo(), you actually invoke this.foo(). Java simply lets you omit the th...
What is the difference between ui-bootstrap-tpls.min.js and ui-bootstrap.min.js?
... templates.
Otherwise you will see something like:
GET http://localhost:8989/hello-world/template/tooltip/tooltip-popup.html 404 (Not Found) angular.js:7073
Error: [$compile:tpload] http://errors.angularjs.org/undefined/$compile/tpload?p0=template%2Ftooltip%2Ftooltip-popup.html
at Error (<a...
The simplest way to comma-delimit a list?
What is the clearest way to comma-delimit a list in Java?
30 Answers
30
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Get a list of resources from classpath directory
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Here is the code
Source: forums.devx.com/showthread.php?t=153784
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.regex.Pattern;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException...
Sending HTTP POST Request In Java
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Sending a POST request is easy in vanilla Java. Starting with a URL, we need t convert it to a URLConnection using url.openConnection();. After that, we need to cast it to a HttpURLConnection, so we can access its setRequestMethod() method to set our method. We final...
Why does int i = 1024 * 1024 * 1024 * 1024 compile without error?
... @iowatiger08: The size of int is fixed; it does not depend on the JVM. Java is not C.
– Martin Schröder
Jul 17 '14 at 11:55
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