Complete list of java interview questions

AJAX

• Getting Started with AJAX using Java

Core Java

• Type Erasure
• Address of a Java Object
• Java’s toLowerCase() has got a surprise for you!
• Is Your Java Code Privileged?
• Serialize / De-Serialize Java Object From Database
• Bye bye GoDaddy
• Java Serialization
• Java Peer Class
• Java String Concatenation
• Formatting Decimal Numbers
• Java Number Format
• Java Overflow And Underflow
• Overloading And Overriding
• Java Clone, Shallow Copy and Deep Copy
• NullPointerException, null – Bad, good and ugly
• Differentiate JVM JRE JDK JIT
• Explain the java this keyword.
• Is javadoc comment a type of standard java comment?
• Check list for Internationalization (I18n)
• What is scoped memory and why java uses it?
• What is a static import in java?
• How many types of java variables are there?
• Explain the Final Keyword in Java.
• Access Modifiers In Java
• Explain the Java Static Modifier
• Difference between static and non-static java inner class.
• Can a java subclass declare a private method available in its java superclass?
• Java Pass By Value and Pass By Reference.
• Can an unreachable Java object become reachable again?
• Java finalization
• Java garbage collection
• Does Java garbage collection guarantee that a program will not run out of memory?

Abstract and Interface

• What is a java marker interface?
• Difference between a Java interface and a Java abstract class?
• When can an object reference be cast to a Java interface reference?
• Java interface
• How can you invoke a defined method of an abstract class?
• What is an abstract class?
• What is an abstract method?

Java Collection

• Read Only Collections
• Difference between Vector and ArrayList in java?
• Explain the methods used for session tracking.

Java Exception

• What are the causes of exceptions in java?
• Explain type of exceptions or checked vs unchecked exceptions in java.
• When does the finally clause in java exception block never executes?

Design Patterns

• Prototype Pattern
• Builder Pattern
• Abstract Factory Pattern
• Factory Method Pattern
• Introduction To Design Patterns

JSP

• How to pre-compile JSP?
• Explain the scope of JSP objects.
• Difference between forward and sendRedirect
• What are the types of JSP Comments?
• Explain the JSP Implicit Objects
• Difference between JSP include directive and JSP include action
• Difference between _jspService() and other life cycle methods.
• JSP Life Cycle – explain.

News

• JAG is Now Unemployed!
• Now the SUN is Red
• javapapers.com Celebrates 400000 Pageviews
• Happy Birthday Apache
• What is EOSL?

oops

• Association, Aggregation, Composition, Abstraction, Generalization, Realization, Dependency

Servlet

• URI And URL Difference
• Session Life Cycle
• Servlet JSP Communication
• Explain the methods used for session tracking.
• What happens if you call destroy() from init() in java servlet?
• How to avoid IllegalStateException in java servlet?
• What is servlet mapping?
• Difference between HttpServlet and GenericServlet
• What is preinitialization of a java servlet?
• Difference between ServletConfig and ServletContext
• Difference between ServletRequest.getRequestDispatcher and ServletContext.getRequestDispatcher
• ServletRequest and ServletResponse – Explain
• Why not declare a constructor in servlet?
• Servlet Life Cycle – Explain
• What is a filter?