Chained Exceptions

dynamic lookup of a method at run time and performance

Accessing Implementations Through Interface References

Finding Packages and CLASSPATH

Why Overridden Methods

dynamic method dispatch and run time polymorphism and performance

Restrictions of Methods declared as static

how Java stores integer values and how it represents negative numbers.

Advantage of representing interger in base 8 and base 16 in java

How to work together with Polymorphism, Encapsulation, and Inheritance

Hows class work as the basis of encapsulation

Parsing, Tokenizing, and Formatting

How to Explicitly Makes Objects Eligible for Collection

Rethrowing the Same Exception

Exception Declaration and the Public Interface

What is Exception Matching

catch more than one type of exception in a single catch clause in java

Facts about string and memory in java

Navigating (Searching) TreeSets and TreeMaps

Autoboxing with Collections

Polymorphism and Generics

Mixing generics and Non Generics collection

Specifying path of file in system independent way using File.separator

Converting unicode character to the local machine representation of characters in java

What is local machine character encoding

Formatting Data into a String

Different ways to get formatted input value

Generics programming and Object casting

Difference between class loading and object initialization

Creating String Objects from Character Arrays

How to use Arrays of Arrays to store large data in JVM

bitCount in java

How encapsulation allows to set legal values on methods

Why polymorphic methods or interface implementations is much easier to maintain and test

Why wrapper classes are immutable

XML namespace mechanism

Locating information with Xpath

How to validate XML documents

Compile time byte code engineering vs load time byte engineering

Instrumentation API and byte code engineering

Ho to define a new class at tun time.Scenario and Use case to need it

How to extend a class at run time.Scenario and Use case to need it

How to implement a interface at run time.Scenario and use case to need it

Generating a source code using annotation processing tool.How ORM framework uses it .How it can be used in framework implementation