Java - What, Where and Why?
History and Features of Java
Internals of Java Program
Difference between JDK,JRE and JVM
Internal Details of JVM
Variable and Data Type

Advantage of OOPs
Object and Class
Method Overloading
Constructor
static variable, method and block
this keyword
Inheritance (IS-A)
Aggregation and Composition(HAS-A)
Method Overriding
Covariant Return Type
super keyword
Instance Initializer block
final keyword
Runtime Polymorphism
static and Dynamic binding
Abstract class and Interface
Downcasting with instanceof operator
Package and Access Modifiers
Encapsulation
Object class
Object Cloning
Java Array
Call By Value and Call By Reference

String : What and Why?
Immutable String
String Comparison
String Concatenation
Substring
Methods of String class
StringBuffer class

Exception Handling : What and Why?
try and catch block
Multiple catch block
Nested try
finally block
throw keyword

Nested Class : What and Why?
Member Inner class
Annonymous Inner class
Local Inner class
static nested class
Nested Interface

Multithreading : What and Why?
Life Cycle of a Thread
Creating Thread
Thread Schedular
Sleeping a thread
Joining a thread
Thread Priority

Life Cycle of Applet
Graphics in Applet
Displaying image in Applet
Animation in Applet
EventHandling in Applet