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Java interview questions for fresher’s experienced

Dear Aspirants Find Here java interview questions for freshers experienced for prepare Interview

Here find Questions below

  • 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?
  • Wht 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 ?

All The Best

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