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Does Java have a HashMap with reverse lookup?
...ame for this type of data structure, and is anything like this included in Java's standard libraries? (or maybe Apache Commons?)
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What is MOJO in Maven?
...plugin-developers/index.html:
What is a Mojo? A mojo is a Maven plain Old Java Object. Each mojo is an executable goal in Maven, and a plugin is a distribution of one or more related mojos.
In short, a mojo is a maven goal, to extend functionality not already found in maven.
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What causes imported Maven project in Eclipse to use Java 1.5 instead of Java 1.6 by default and how
I imported a Maven project and it used Java 1.5 even though I have 1.6 configured as my Eclipse default Preferences->Java->Installed JREs .
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Setting the default Java character encoding
...rd Grech points out, in a special case like this, the environment variable JAVA_TOOL_OPTIONS can be used to specify this property, but it's normally done like this:
java -Dfile.encoding=UTF-8 … com.x.Main
Charset.defaultCharset() will reflect changes to the file.encoding property, but most of t...
Draw a perfect circle from user's touch
...ion mechanism based on that idea. See working demo below (Sorry, I'm using Java as the fastest way to provide this fast and a bit dirty example):
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Head...
Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
...ed in the presence of mutable data. This is why generics are invariant in Java. Brief example of unsoundness using Java arrays (which are erroneously covariant):
Object[] arr = new Integer[1];
arr[0] = "Hello, there!";
We just assigned a value of type String to an array of type Integer[]. For ...
Android Archive Library (aar) vs standard jar
... as the standard build system for Android apps. Well, coming from standard Java development I usually depend on jar files in order to build my project. However it seems that Android has also aar packages, which are the equivalent to the dll files in a Windows OS, as mentioned here :
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How do I find out which settings.xml file maven is using
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Apache Maven 3.0.3 (r1075438; 2011-02-28 18:31:09+0100)
Maven home: /usr/java/apache-maven-3.0.3
Java version: 1.6.0_12, vendor: Sun Microsystems Inc.
Java home: /usr/java/jdk1.6.0_12/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "2.6.32-32-generic", arch: "i386", ...
Converting JSON data to Java object
I want to be able to access properties from a JSON string within my Java action method. The string is available by simply saying myJsonString = object.getJson() . Below is an example of what the string can look like:
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