Java

How do cookies work in Servlets?

What is Java String Pool?

Can a single try block have multiple catch blocks in a Java program?

Can a static method be overloaded in Java?

Differentiate between constructors and methods in Java?

Explain abstraction in Java.

Explain encapsulation in Java.

Explain inheritance in Java.

Explain polymorphism in Java.

Explain the concept of constructor overloading.

Explain the concept of Java Generics.

Explain the difference between a HashSet and a TreeSet in Java.

Explain the difference between a shallow copy and a deep copy of an object in Java.

Explain the difference between final, finally, and finalize in Java.

Explain what JDK, JRE and JVM are in Java?

How does an exception propagate through the code?

How does the ArrayList grow dynamically and how is this implemented internally?

How does the new operator differ from the newInstance() method in Java?

Is it possible to execute code before the main method runs?

Is it possible to make the main thread a daemon thread?

List the steps to connect to a database in Java?

Name the main OOP concepts in Java?

What are access modifiers in Java?

What are the advantages of Packages in Java?

What are the differences between Arrays and ArrayLists in Java?

What are the differences between HashMap and HashTable in Java?

What are the differences between interfaces and abstract classes in Java?

What are the different types of inheritance in Java?

What are the main components of the JDBC API?

What is a Comparator in Java?

What is a Servlet?

What is a singleton class in Java and how is it implemented?

What is Aggregation in Java?

What is an enum in Java?

What is an exception in Java?

What is classloader?

What is composition in Java?

What is covariant return type?

What is final keyword in Java?

What is Hibernate?

What is JDBC Driver?

What is JIT compiler in Java?

What is method overloading?

What is method overriding?

What is Object Cloning in Java?

What is runtime polymorphism?

What is the 'IS-A' relationship in Java OOP?

What is the difference between a checked and unchecked exception?

What is the difference between a servlet and a JSP (JavaServer Pages)?

What is the difference between aggregation and composition?

What is the difference between an error and an exception in Java?

What is the difference between sleep() and wait() methods in Java?

What is the difference between the throw and throws in Java?

What is the difference between this() and super() in Java?

What is the life-cycle of a Servlet?

What is the purpose of the volatile keyword in Java?

Why is the main method static in Java?

What is a marker interface?

Can a program exceed its memory limit even with a garbage collector present in Java?

Define Late Binding.

Describe the Java thread lifecycle.

Explain dependency injection in Java.

Explain difference between Comparable and Comparator in Java?

What are the differences between static and non-static methods in Java?

What are the different methods to use threads in Java?

What are the different types of Thread Priorities in Java?

What does the term Double Brace Initialization mean in Java?

What is a Java Lambda Expression?

What is a memory leak and how can it be caused?

What is a Thread in Java?

What is an iterator in Java?

What is garbage collection?

What is multithreading?

What is the Daemon Thread?

What is the difference between >> and >>> operators in Java?

What is the difference between static methods, static variables, and static classes in Java?

What part of memory is cleaned in the garbage collection process in Java?

When does an object in Java become eligible for garbage collection?