Xtend Parent/Container
· Xtend is a little language that compiles into idiomatic Java source code. You can use any existing Java library seamlessly from Xtend (and vice-versa). The compiled output is readable and pretty-printed, and tends to run as fast or faster than the equivalent handwritten Java code. It's the CoffeeScript for Java.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window org.eclipse.xtend.maven-2.4.3.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.