| What is Single Inheritance? |
| What is Multilevel Inheritance? |
| What is Hierarchical Inheritance? |
| What is Hybrid Inheritance? |
| What is Multiple Inheritance? |
| What is string constant pool? |
| What is special about string objects as compared to objects of other derived types? |
| What is the difference between String, StringBuffer and StringBuilder? |
| What is string intern? |
| What is the main difference between Java strings and C, C++ strings? |
| What is the similarity and difference between String and StringBuffer class? |
| What is the similarity and difference between StringBuffer and StringBuilder class? |
| What is difference between Java 8 StringJoiner, String.join() and Collectors.joining()? |
| What is ArrayStoreException in java? When you will get this exception? |
| What is an anonymous array? Give example? |
| What is the difference between int[] a and int a[] ? |
| What is ArrayIndexOutOfBoundsException in java? When it occurs? |
| What are the types of inheritance.? |
| What are the differences between Array and ArrayList in java? |
| What are the different ways of copying an array into another array? |
| What are jagged arrays in java? Give example? |
| What are the different ways of declaring multidimensional arrays in java? |
| What are the different ways to iterate over an array in java? |
| What are the drawbacks of the arrays in java? |
| What do you mean by inheritance.? |
| What do you mean by mutable and immutable objects? |
| What do you think about string constant pool? Why they have provided this pool as we can store string objects in the heap memory itself? |
| What happens if both, super class and sub class, have a field with same name.? |
| What value does array elements get, if they are not initialized? |
| How to reverse a sentence word by word in Java? |
| How do you implement multiple inheritance in java? |
| How do you restrict a member of a class from inheriting to it’s sub classes.? |
| How do you create mutable string objects? |
| How do you convert given string to char array? |
| How do you count the number of occurrences of each character in a string? |
| How do you remove all white spaces from a string in Java? |
| How do you find duplicate characters in a string? |
| How do you convert string to integer and integer to string in Java? |
| How do you check the equality of two arrays in java? OR How do you compare the two arrays in java? |
| How do you sort the array elements? |
| How do you find the intersection of two arrays in java? |
| How do you search an array for a specific element? |
| How do you find duplicate elements in an array? |
| How do you find second largest element in an array of integers? |
| How do you find all pairs of elements in an array whose sum is equal to a given number? |
| How do you separate zeros from non-zeros in an integer array? |
| How do you find continuous sub array whose sum is equal to a given number? |
| Are constructors and initializers also inherited to sub classes.? |
| Are static members inherited to sub classes? |
| Can a class extend more than one classes or does java support multiple inheritance? If not, why? |
| Can a class extend itself.? |
| Can we call String class methods using string literals? |
| Can you pass the negative number as an array size? |
| Can you change the size of the array once you define it? OR Can you insert or delete the elements after creating an array? |
| Can you instantiate this class? |
| Do you have any idea why strings have been made immutable in Java? |
| How find maximum occurring character in a string in Java? |
| In how many ways you can create string objects in Java? |
| Is String a keyword in Java? |
| Is String a primitive type or derived type? |
| Print all substrings of a string in Java? |
| Print common characters between two strings in alphabetical order in Java? |
| Where exactly string constant pool is located in the memory? |
| Which class do you recommend among String, StringBuffer and StringBuilder classes if I want mutable and thread safe objects? |
| Which one will you prefer among “==” and equals() method to compare two string objects? |
| While creating the multidimensional arrays, can you specify an array dimension after an empty dimension? |
| Why StringBuffer and StringBuilder classes are introduced in Java when there already exist String class to represent the set of characters? |
| Write a Java program to reverse a string? |
| Write a Java program to check whether two strings are anagram or not? |
| Write a Java program to reverse a given string with preserving the position of spaces? |
| Write a code to prove that strings are immutable in Java? |
| Write a code to check whether one string is a rotation of another? |
| Write a Java program to reverse each word of a given string? |
| You know that all classes in java are inherited from java.lang.Object class. Are interfaces also inherited from Object class.? |
| What is Destructor? |
| What are manipulators? |
| What is a virtual function? |
| What is a ternary operator? |
| What is method overriding? |
| What is the main difference between overloading and overriding? |
| What is the difference between new and override? |
| What is Polymorphism? |
| What is Abstraction? |
| What is hierarchical inheritance? |
| What is Runtime Polymorphism (Dynamic Polymorphism)? |
| What is Compile time polymorphism (Static polymorphism)? |
| What is encapsulation? |
| What is the diamond problem? |
| What is Aggregation? |
| What is the difference between Association and Dependency? |
| What is Composition? |
| What Is Operator Overloading? |
| What Is The Use Of Finalize Method? |
| What Is Exception Handling? |
| What Is Pure Virtual Function? |
| What are the rules of method overloading and overriding in Java? |
| What is the covariant method overriding in Java? |
| What problem is solved by the Strategy pattern in Java? |
| What are the problems might be created when you are trying to implement multiple inheritance concept in java? |
| What are the pillars of OOP theory? |
| What is a parametric constructor? |
| What is a friend function? |
| What is early binding? |
| What is late binding? |
| What are tokens? |
| What is the need of abstract class? |
| What is the key difference between concrete class and abstract class? |
| What are the advantages of object oriented programming? |
| What are the properties that are defined in an Object model? |
| What is Coupling? |
| What is Is-A and Has-A relationship? |
| What is object cloning? |
| What is multiple inheritance? |
| What are access modifiers? |
| What is a class? |
| What is a constructor in java? |
| What is a superclass? |
| What is a token? |
| What is an Abstract class in OOP? |
| What is an object? |
| What is Association? |
| What is class and object? |
| What is data hiding? |
| What is early and late binding? |
| What is inheritance? Benefits? Types? |
| What is Oops? Features? Why do we need OOPs? |
| What is Static Binding? |
| What is subclass? |
| What is super () in Java? |
| What is the difference between class and structure? |
| What is the difference between classes and objects? |
| What is Autoboxing and Unboxing? |
| What is JVM, JDK and JRE? |
| What is the Java’s WORA nature? |
| What is Serialization? When should we make use of serialization? |
| What is Constructor and Constructor Overloading in Java. |
| What is Expressions? |
| What is class in Java. |
| What is JSON. |
| What is Loops? Types? |
| What is Interface in Java |
| What is Aggregation |
| What is Java Collections |
| What is Serialization |
| What is Use Cases in Java |
| What is Overloading and Overriding in Java? |
| What is a List? |
| What is the case when you override hashcode() and equals() ? What problem can occur if we don’t override hashcode() method? |
| What is immutable classes? |
| What is Singleton in Java? |
| What is the Final Keyword in Java? |
| What is Collection and a Collections Framework? |
| What do you mean by BlockingQueue in Java Collections Framework? |
| What is a platform? |
| What is classloader? |
| What is the static method? |
| What are the two ways of implementing multi-threading in Java? |
| What is constructor chaining in Java? |
| What kind of variables can a class consist of? |
| What is Singleton class? |
| What do you mean by Access Modifier? |
| What is an applet? |
| What is Comparable Interface? |
| What are the actions present in the JVM? |
| What is the current version of JDK? |
| What is Wrapper class? |
| What is String? |
| What is Function? |
| What is Class? |
| What is Object? |
| Why Java does not support multiple inheritance? |
| What is scope?Describe the types of scope? |
| What is Multitasking? How to achieve multitasking? |
| What is Thread? |
| what is Multithreading? |
| What is Serialization? |
| What is DeSerialization? |
| What is Java ? |
| What is Treeset? |
| What happens if you add same key in the hashmap? |
| What is default method in java 8 interface? |
| What is token in c |
| What is keywords, data type, constant and variable |
| What are the fundamental data type in c |
| What are the conditional statement |
| What are the un-conditional statement |
| What is if—else statement |
| What is switch case statements |
| What is conditional operator |
| What are the iterative statement |
| What is an array |
| What is sorting |
| What is searching |
| What is function |
| What is recursive function |
| What is structure |
| What is pre-processor directive |
| What is micro in c |
| What is file |
| What is file pointer |
| What is data structure |
| What is stack |
| What is queue |
| What is link list |
| What is binary tree |
| What is spanning tree |
| What is constructor and destructor in c++ |
| What is static keyword |
| What is friend function |
| What is pure virtual function |
| What is copy contractor in c++ |
| What is Java |
| What final in java |
| What is super keyword in java |
| What is an applet program |
| What is thread |
| What is synchronisation |
| What is JDBC |
| What are jdbc driver |
| What are steps involved in data base connectivity |
| What will be the result of relational operators? |
| What will happen if we use throws keyword in body? |
| What is the default priority of thread? |
| What is default priority of gc()? |
| What is Comparator? |
| What is workspace? |
| What are Access specifiers? |
| What is Multiple Mitigation? |
| What stand is for JDK, JRR and JVM? |
| What is the default size of the loaded factor in hacking on the basis of the collection? |
| What is a collection? |
| What is Exception Classes are the Basic Class? |
| What is a JVM? |
| What researchers are in Java? |
| What is a standard method? |
| What is the subject class? |
| What are the packages in Java? |
| What is the standard import? |
| What is the benefit of Volatile Variable |
| What is hashCode method? And why it is to be overridden? |
| What is the contract between equals and hashCode? |
| What is the need of toString() method? |
| What is the need of Reflection API? |
| What is the need of anonymous inner classes? |
| What is a JVM? What is the utilization of JVM? |
| What is the contrast between JDK, JRE and JVM? |
| What is Object Oriented worldview? |
| What is the EAR record? |
| What is a MVC Architecture? |
| what number kinds of constructors are utilized in Java? |
| What are the principle employments of the super catchphrase? |
| What is the distinction between the last strategy and theoretical technique? |
| What is the contrast among Collection and Collections in JAVA? |
| What is JSTL? |
| What are Exceptions in Java? Types? |
| What is JSF? |
| What are Action Forms? |
| What is JDBC? |
| What is a JDBC driver and what number of JDBC drivers are accessible? |
| What are the JDBC proclamations? |
| What are the exemptions in JDBC? |
| What the base class in Java from which all classes are derived? |
| What the purpose of using Break in each case of Switch Statement? |
| What is decision Making in Java |
| What is Thread in Java |
| What is wait () method |
| What is static block |
| What is the key word in exceptional handling? |
| What is the key word? |
| What is banned? |
| What is Java Bean? |
| What are the operations of collections? |
| What are the types of Polymorphism in Java? |
| What are the advantages of Polymorphism? |
| What is Binding in Java? |
| What are the types of binding in Java? |
| What is Static binding in Java? |
| What is Dynamic binding in Java? |
| What is the difference between static binding and dynamic binding in Java? |
| What is object-oriented programming? |
| What are the four important characteristics of object-oriented programming |
| What is procedural programming paradigm |
| What is JDK? |
| What is JRE? |
| What are the main components of JRE? |
| What is Class Loader? |
| What is Interpreter? |
| What is JVM? |
| What are the main activities (tasks) that are performed by JVM? |
| What is Java API? What is the popular Java API? |
| What is Bytecode verifier? |
| What is Java Library? |
| What is Bytecode in Java? |
| What is the difference between bytecode and machine code? |
| What is source code in Java? |
| What is the difference between source code and bytecode? |
| What is the role of Execution engine in JVM? |
| What is Java compiler? What are the functions (responsible tasks) for Java compiler? |
| What are the different types of memory areas allotted by JVM |
| What is JIT Compiler? And explain its need? |
| Name the Data Types that are supported by Java? |
| Name the different states of a thread. |
| Name the most important aspect of Java |
| Write a Program using Arraylist to add and remove some items from the list. |
| What is constructor? |
| What is hashtable? |
| What is multi-threading and the ways of implementing multi-threading in Java? |
| What is Java Heap Space? |
| What is user define function? |
| What is garbage collections? |
| What is “this” keyword |
| What is “Super” keyword? |
| What is final variable |
| What is HashSet |
| What is notify () and notify all () |
| What is applet |
| What is Thread life-cycle |
| How HashMap internal working ? |
| How internallly hashset working? |
| Provide the features of Hashtable method |
| What are the keywords available in exception handling? |
| Provide the list of thread methods to stop a thread in Java |
| Provide byte datatype default value in Java |
| Why is Inheritance used in Java? |
| Why is OOP better than procedural? |
| Why is dynamic binding used in object-oriented programming? |
| How is Inheritance useful to achieve Polymorphism in Java? |
| Why Encapsulation in java is called as Data hiding in java? |
| Why is Java known as the Platform Independent Programming Language? |
| Why break is used in Switch Statement’s each case? |
| Why are Strings are called as Immutable? |
| Why Java is considered dynamic? |
| Why is StringBuffer called mutable? |
| Why Runnable Interface is used in Java? |
| Why IS Java application platform independent? |
| Why used super and this keyword in java? |
| Why we cannot be apply access specifiers to packages, initializers, local variables? |
| Why do we say Java is dynamic? |
| Why java is platform-independent language? |
| Why wait() method is in Object class and not in Thread class? |
| Why Map Hierarchy is kept separate form Collection Hierarchy? |
| Why static binding is also called early binding in Java? |
| Why Dynamic binding is also called late binding in java? |
| Why binding of private, static, and final methods are always static binding in Java? |
| Why is Java System Independent |
| Why is Java Portable? |
| Why compiled java code can execute on different computer machines? |
| Which class Cannot be a subclass in Java? |
| Which types of exceptions are caught at compile time? |
| Which thread will execute first? |
| Which data structure set uses? |
| Which name will be checked by the compiler for the execution of program? |
| Which name will be checked by the JVM after the compiling the program? |
| Which operators are used for masking the data in encryption and decryption process? |
| Which is maintained to manage the life cycle of local variables? |
| Which operator is not used in java? |
| Which exceptions are used to represent the business/environmental failure? |
| Which feature allows the JVM to run more than one thread in java? |
| Which methods are there in the thread class? |
| Which condition will result in Illegal state exception? |
| Which will manage the lifecycle of thread? |
| Which interface will result in sorted order? |
| Which will interact with hard disk? |
| Which of the following is not the Java object Class method? |
| How many instances can be created for an abstract class? |
| How Can We Call The Base Method Without Creating An Instance? |
| How do you differentiate between a class and an object? |
| How do structure and class differ? |
| How a program can be structured using the concept of Object oriented programming? |
| How many types of constructors are used in Java? |
| How can struct be instantiated? |
| How do you differentiate a HashSet class and a TreeSet class? |
| How can you define Object Cloning in Java? |
| How can we execute any code even before the main method? |
| How would you call wait() method? Would you use if block or loop, and why? |
| How do you take thread dump in Java? |
| How we can execute any code even before main method? |
| How can we make the copy of a Java object? |
| How to achieve lock? |
| How to get the current thread? |
| How to sort the collections? |
| How are they destroyed in Java? |
| How many times do you call the trash cushion for the last time () method for an object? |
| How can garbage collection be enforced? |
| How many ways the object can be created? |
| Difference - Composition vs Inheritance? |
| How Java compiler differentiate between methods in Compile time Polymorphism? |
| How to achieve/implement dynamic polymorphism in Java? |
| How Java compiler performs static binding? |
| How JVM performs dynamic binding in Java? |
| How does Bytecode work in Java? |
| When a byte datatype is used? |
| When parseInt() method can be used? |
| When throw keyword is used? |
| When a super keyword is used? |
| When null pointer exception occurs? |
| When Out of memory error occurs? |
| When Out of stack error occurs? |
| When we can use final class? |
| When was Java created? |
| Where all string literals are managed? |
| Difference - Procedural programming VS OOPS |
| Difference - Compile-time and runtime-polymorphism? |
| Difference - Primitive == vs overridden equals() method? |
| Difference - String vs StringBuffer vs StringBuilder? |
| Difference - Checked and Un-Checked Exceptions? |
| Difference - throw and throws keyword? |
| Difference - wait() and sleep() method? |
| Difference - Abstraction vs encapsulation |
| Difference - ArrayList and Vector |
| Difference - ArrayList and Vector? |
| Difference - Enumeration and Iterator? |
| Difference - JDK, JRE, and JVM? |
| Difference - Inner Class and a Sub-Class? |
| Difference - Sleep and Wait in Java? |
| Difference - final, finalize and finally? |
| Difference - poll() and remove() method? |
| Difference - StringBuilder and StrinngBuffer? |
| Difference - Abstract and Interface |
| Difference - while and do-while |
| Difference - Fixed and Dynamic load? |
| Difference - Array and Vector? |
| Difference - Stack and Queue? |
| Difference - Stack and the Queue? |
| Difference - importing java.util.Date and java.util? *? |
| Difference - Multithreading and Multiprocessing? |
| Difference - Array and Arraylist? |
| Difference - error and exception? |
| Difference between abstract and final method |
| Difference - ArrayList and a LinkedList? |
| Difference Java compiler and interpreter? |
| In a class which is the default access modifier in java? |
| In which scenarios Arraylist and LinkedList will be used? |
| In Heap memory which variables are created? |
| In java, how arrays are created? |
| In Java is it pass by value or pass by reference? |
| Will all the Try blocks in Java end with Catch Blocks? |
| Will you be able to overload the main() method? |
| Do you know whether constructor returns any value in Java? |
| Abstract class cannot be instantiated. Why? |
| Abstract method cannot have body, why? |
| Are you connecting to a database in Java? |
| Difference - NoClassDefFoundError vs ClassNotFoundException? |
| At time of method overriding can return type be different? |
| Can we make a class both final and abstract at the same time? |
| Can you explain what Access Modifiers are? |
| Can we change the scope of the overridden method in the subclass? |
| Can we override a method declared as private in java? |
| Can you override the method which is declared as final? |
| Can a constructor be declared as private in java? |
| Can a class extend two interfaces wherein they both have a method with the same name and signature in java? |
| Can struct have Parameterless constructor? |
| Can constructor be static? |
| Can a struct be null? |
| Can struct have inheritance? |
| Can struct inherit? |
| Can we override static method? |
| Can you call the base class method without creating an instance? |
| Can you explain what Access Modifiers are? |
| Can a class have multiple constructors? |
| Can we have two methods in a class with the same name? |
| Can we use a default constructor of a class even if an explicit constructor is defined? |
| Can we override a method by using same method name and arguments but different return types? |
| Can we add null key to the hashmap? |
| Can we have filename and classname as same? |
| Are the exceptions defined in JavaScript packages? Or are there any definitions for all classes? |
| Can we have two start() methods in thread execution? |
| Can a Dead End Start Again? |
| Can the standard block be lifted? |
| Can we try or do not try to stop it? |
| Can finally ban without c block? |
| Can exceptions occur in catch block? |
| Can you give an example of pointers? |
| Can static methods be overridden? |
| Conside the following block and predict the output |
| Consider the following code. |
| Differences - Polymorphism and Inheritance |
| Does java 8 supports functional programming? |
| Does java support pointers? |
| From which method the execution of java programs begins? |
| Functions of JVM and JRE? |
| Garbage collection in Java? |
| Give an example of static binding. |
| Give an example of dynamic binding in Java. |
| Give few examples of object-oriented language other than Java |
| Hashmap put() operations uses which datastrcture when the hashcode is same ? |
| If we don’t initialize Boolean variable and print that Boolean value, false will be the output |
| Is Java a pure object-oriented language? if not why? |
| Is a method declared as final inherited in java? |
| Is it possible to declare a class as Abstract without using any abstract method? |
| Is it true that a java program never goes out of memory because of garbage collection feature? |
| Is throw and throws keyword can be used interchangeably? If no, what is the difference between the two? |
| Is String a data type in java? |
| Is ++ operator thread-safe in Java? |
| Is wrapper classes overrides hashcode and equals method. |
| Is there a number of capture blocks after an endorsement line? |
| Is it possible to make a constructor final? |
| Is it possible to overload the constructors? |
| Is it possible to use both “this()” and “super()” in a constructor? |
| Is possible for you to declare a constructor as final? |
| Is it possible to implement runtime polymorphism by data members in Java? |
| Java is fully OOPS language or not? |
| List out the 5 access modifiers |
| List any five features of Java? |
| List the three steps for creating an Object for a class? |
| List out the different access specifiers available for Java classes |
| List out the constructors in Java |
| List out the advantages of Java packages |
| List out the vital advantages of the keyword “Super” |
| List out the interfaces available in Java collections |
| List out the Classes available in Java collections |
| List out the maps available in Java collections |
| Mention the access specifiers used in Java? |
| Mention the class which is the superclass for the entire classes |
| Can you handle a catch in an exception to an exception? |
| Sort of ancient data types? |
| The object which has no reference is called? |
| The use of Java’s last words? |
| Throw some light on the main features of Java. |
| Throwing in Java |
| To set a permit for the thread that wants access to the shared resource is called, |
| Two differences in the state between a class and one square |
| Types of Access Specifiers? |
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