Data Types and Variables Declaration and Access Control Array Strings Operators Constructors and Methods Flow Control Overriding and Overloading Interfaces and Abstract Classes Inheritence Exceptions Threads Input Output Regular Expressions in Java Event Handling in Java Collections Framework in java Java Serialization and Networking Java Autoboxing Generics in Java Java Beans and JDBC Java Server and Servlet Session Management, JSP and API Application Lifecycle and Annotation Miscellaneous in Java