Here are some tutorials in java on various topics , basically from the basics of java  free Java Course Lessons from rocw.raifoundation.org. These will help you get a better grasp. The areas covered by these include: Working With Objects, Arrays And Conditionals, Loops, Classes, Methods, Java Applets, Animation And Threads, Sounds, Exceptions, Multithreading, Ui Actions And Events, using the Java Abstract Windowing Toolkit, Networking, Packages And Interfaces, Streaming-Input, Streaming-Output, and JDBC. This site offers many online computing and I.T. courses that can be freely used for self-study and in the classroom. Here is a google search you can use to find the course lessons you are looking for. Just change the ‘java’ keyword to what you need.
Java Programming Course Lessons:
Lesson 1:  Java Overview And Installation Tips
Lesson 2:  An Introduction To Java Programming
Lesson 3:  Object-Oriented Programming And Java
Lesson 4:  Basics Of Java Programming

Lesson 5:  Solved Examples
Lesson 6:  Working With Objects
Lesson 7:  Arrays And Conditionals
Lesson 8:  Loops In Java
Lesson 9:  Creating Classes And Applications In Java
Lesson 10:  More About Methods
Lesson 11:  Java Applet Basics
Lesson 12:  Graphics And Fonts
Lesson 13:  Using Fonts And Color Objects
Lesson 14:  Simple Animation And Threads
Lesson 15:  Reducing Animation Screen Flickers
Lesson 16:  More Animation, Images, And Sound
Lesson 17:  Retrieving And Using Sounds
Lesson 18:  Creating Animation
Lesson 19:  Throwing Exceptions (Solved Exercises)
Lesson 20:  Multithreading
Lesson 21:  Managing Simple Events And Interactivity
Lesson 22:  Handling Ui Actions And Events
Lesson 23:  The Java Abstract Windowing Toolkit
Lesson 24:  Networking
Lesson 25:  Using Awt Windows In Stand-Alone Applications
Lesson 26:  Modifiers
Lesson 27:  Packages And Interfaces
Lesson 28:  Streaming-Input
Lesson 29:  Streaming-Output
Lesson 30:  Installing JDBC
Lesson 31:  JDBC-Examples & Exercises

Hope that helped !!!

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