What do you know about Java? What are the supported platforms by Java Programming Language? List any five features of Java ? Why is Java Architectural Neutral ? How Java enabled High Performance ? Why Java is considered dynamic? What are the principle concepts of OOPS ? What is JVM Java Virtual Machine? What is JIT Just-in-Time Compilation? Define class? What kind of variables a class can consist of? What is a Local Variable What is a Instance Variable What is a Class Variable What is Singleton class? What is Abstraction? What is Encapsulation? What is the difference between abstraction and encapsulation? What is Inheritance? What is Polymorphism? How does Java implement polymorphism? Explain the different forms of Polymorphism What is runtime polymorphism or dynamic method dispatch? What is the most important feature of Java? What do you mean by platform independence? What is a JVM? What is the difference between a JDK and a JVM? What is a class type in Java? Class types vs Object types vs Reference types ? The differences between class and primitive types in Java ? Different memory requirements for variables of class types and primitive types Which Java operator is right associative? What are order of precedence and associativity, and how are they used? Can a double value be cast to a byte? What is the percentage operator? Is sizeof a keyword? What is the difference between a while statement and a do statement? What is Class Loader in java? What is the order of execution of Class Loader in java? What is differenence between ClassNotFoundException and NoClassDefFoundError ? Explain Garbage collection mechanism in Java? What kind of thread is the Garbage collector thread? Does garbage collection guarantee that a program will not run out of memory? What is the purpose of finalization? If an object is garbage collected can it become reachable again? What are different types of access modifiers? What is Constructor? How does the Java default constructor be provided? Can constructor be inherited? What are Access Specifiers What is final modifier? What are the uses of final method? What is method overloading? What is method overriding? Can overloaded methods be override too? Is it possible to override the main method? What is an Interface? Can we instantiate an interface? Can we create an object for an interface? Do interfaces have member variables? What modifiers are allowed for methods in an Interface? What is a marker interface? What is an abstract class? Can we instantiate an abstract class? When should I use abstract classes and when should I use interfaces? When you declare a method as abstract, can other nonabstract methods access it? Can there be an abstract class with no abstract methods in it? What is static block? What are static variables? What is the difference between static and non static variables? What are static methods? Can Enum implement interface in Java? Can Enum extends class in Java? Can we declare Constructor inside Enum in Java? Can we use Enum with TreeSet or TreeMap in Java? Can we use Enum in switch case in Java? How to iterate over all instance of a Enum? What is advantage and disadvantage of using Enum as Singleton? How to convert an String to Enum in Java? What is an Iterator ? How do you traverse through a collection using its Iterator? How do you remove elements during Iteration? How is ListIterator? What is the List interface? What are the main implementations of the List interface ? What are the advantages of ArrayList over arrays ? How to obtain Array from an ArrayList ? Why are Iterators returned by ArrayList called Fail Fast ? What is the Set interface ? What are the main Implementations of the Set interface ? What is a HashSet ? What is a TreeSet ? What is an EnumSet ? What is a Map ? What are the main Implementations of the Map interface ? What is a TreeMap ? How do you decide when to use HashMap and when to use TreeMap ? What Are the different Collection Views That Maps Provide? What is a KeySet View ? What is a Values Collection View ? What is an EntrySet View ? What is the Comparable interface ?
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