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This blog targets mainly to identify the most common concepts that one want to look at, when they want to brush-up their knowledge on java.
In this blog 1->2->3->4 java, I am just trying to provide those concepts in 4-levels depending on their complexity.

1. Easy
2. Moderate
3. Hard
4. Hardest

core java

1. Fundamentals Q&A 1 2 3 4
2. I/O
3. Exception Handling Tutorial 1 2 3 4Q&A 1 2 3 4
4. Collections Tutorial 1 2 3 4 Q&A 1 2 3 4
5. AWT
6. net
7. Swing Q&A 1 2 3 4
8. Applet
9. Performance
10. Memory Q&A 1 2 3 4

OOPS

1. Fundamentals Q&A 1 2 3 4

Servlets

• Tutorial 1 2 3 4 Q&A 1 2 3 4

JSP Q&A 1 2 3 4

XML Tutorial 1 2 3 4 Q&A 1 2 3 4

OpenSource Frameworks

Spring Q&A 1 2 3 4
Struts Q&A 1 2 3 4
Hibernate Q&A 1 2 3 4
Maven 2 Tutorial 1