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What is a Constructor, Constructor Overloading and Copy-Constructor in Java ?

When is the finalize() called? What is the purpose of finalization?

Does Java support multiple inheritance?

What’s the difference between Enumeration and Iterator interfaces?

What is the importance of hashCode() and equals() methods?

What’s a deadlock?

Explain the role of Driver in JDBC.

What is the difference between GenericServlet and HttpServlet ?

What is the relationship between an event-listener interface and an event-adapter class?

What is a Server Side Include (SSI)?

What is static initializer in java?

What is the difference between HashMap , LinkedHashMap and TreeMap in Java?

What is the JIT in Java?

Is Java pass-by-reference or pass-by-value?

What is the main difference between StringBuffer and StringBuilder ?

What’s the difference between a ClassNotFoundException and NoClassDefFoundError ?

Why Collection doesn’t extend Cloneable and Serializable interfaces?

Which Swing methods are thread-safe?

Explain different ways of creating a thread. Which one would you prefer and why?

How does finally block differ from finalize() method?

What is Comparable and Comparator interface? List their differences.

What is Java Priority Queue?

What happens when an Applet is loaded?

What differences exist between Iterator and ListIterator ?

Can you access non static variable in static context?

What is difference between Array and ArrayList ? When will you use Array over ArrayList ?

What is the advantage of PreparedStatement over Statement ?

What are the advantages of JSP?

Explain the life cycle of a Servlet

Is there anything like static class in Java?

Compare the sleep() and wait() methods in Java

Can == be used on enum in Java ?

What is the Java Classloader?

How threadsafe is enum in Java?

What's the advantage of using getters and setters?

What is the applet security manager, and what does it provide?

What is difference between fail-fast and fail-safe?

What is the difference between throw and throws ?

Explain the life cycle of an Applet.

What are the restrictions imposed on Java applets?

What is difference between ArrayList and LinkedList ?

If an object reference is set to null , will the Garbage Collector immediately free the memory held by that object?

What are Scriptlets in Java?

What is the difference between an Applet and a Servlet?

What is the difference between doGet() and doPost() ?

What is the difference between public , protected , package-private and private in Java?

What are the differences between '==' and equals in java?

What is a JavaBean exactly?

Can an enum be extended?

How do I break out of nested loops in Java?

What do the ... dots in the method parameters mean in java?

What is the tradeoff between using an unordered array versus an ordered array?

What are untrusted applets?

What is structure of Java Heap ?

What is the role of stub in RMI?

What are the steps involved to make work a RMI program?

What is meant by JSP implicit objects and what are they?

What is the volatile keyword useful for?

How and where are Annotations used in Java?

Why does Java have transient fields?

What is the difference between final , finalize and finally in java?