Important References:

Java world: Below is the list of references which remained invaluable resources to learn and practice Java programming .

http://docs.oracle.com/javase/tutorial/uiswing/learn/index.html http://docs.oracle.com/javafx/2/get_started/hello_world.htm http://www.java2s.com/Tutorial/Java/CatalogJava.htm http://www.tutorialspoint.com/java/java_files_io.htm https://www.guru99.com/java-tutorial.html  http://www.ugrad.cs.ubc.ca/~cs219/CourseNotes/Java/applets/graphicsClass.html http://www.eeng.dcu.ie/~ee553/ee402notes/html/ch07s03.html JavaFX https://docs.oracle.com/javase/8/javafx/get-started-tutorial/hello_world.htm Oracle Site http://docs.oracle.com/javase/tutorial/collections/interfaces/index.html http://docs.oracle.com/javase/tutorial/java/generics/index.html  http://www.seriy.ca Random programming mode from a web developer Java Diagrams http://www.falkhausen.de/en/diagram/html/java.net.URLConnection.html

Programmers seeking certifications: https://docs.oracle.com/javase/tutorial/extra/certification/javase-7-programmer1.html Tutorials : Hands on tutorials, and the examples bridging past & presents of  java libraries in depth. https://www.guru99.com/java-tutorial.html http://www.tutorialspoint.com/java/java_files_io.htm https://docs.oracle.com/javase/tutorial/index.html