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Top 12 commonly asked Important Java Interview Questions on OOPs Concepts | TalentSprint

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JAVA INTERVIEW QUESTIONS :OOPS Concepts

Java Interview Questions and Answers or Freshers and Experienced.

-Explain OOPs Concepts?
-Difference between class and an Object?
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Object Oriented Programming Concepts - Part 1 | Core Java Interview Question

Object oriented programming concepts in java explained in this video. Inheritance, Polymorphism, Abstraction and Encapsulation

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???? Top 20 Java Interview Questions and Answers for Freshers and Experienced By SabkuchhLearn

???? We are going to share the latest interview Questions with answers for Java Developer and Java Programmer. Here you can find the Java Interview Questions for Freshers and other hand Java Interview Questions for Experienced. If you have any doubts regarding Java interview Questions or answers you can easily drop your comment in the comment box sure I will try to reply to your questions. Subscribe my Channel for Interview Questions and Answers @sabkuchhlearn

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4. Advance Java (2 Questions and Answers)
5. RESTful Services (8 Questions and Answers)
6. MultiThreading (18 Questions and Answers)
7. Spring (36 Questions and Answers)
8. Hibernate (12 Questions and Answers)
9. Database (2 Questions and Answers)
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Core Java Basic Interview Question Till Arrays in Java
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2:30 How java is platform independent Programming Language ?
13:17 How many .class (byte code) file will be created ?
16:39 What is main difference between Jdk1.8 (Java Developement Kit) and Jdk1.9 ?
22:36 Can we write java program in unicode ?
30:58 How to declare constant in Java ?
36:41 Can we change the value of final Variable in Java ?
38:38 What Jshell in Java ? Jshell from Java 9
49:42 How to open Jshell ? how to write Program in Jshell?
1:03:20 How user defined data types are available in java ?
1:07:16 What will be output (2.00-1.10) ?
1:09:03 What is compound Assignment in java ?
1:16:15 What is difference between bitwise and logical Operator in java ?
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Different types of Array in Java ?
1:35:49 Different ways to declare array in Java ?
1:39:59 what will happen when we use negative Value as an array Size ?
1:47:29 What is the use of final keyword with array in java ?
2:01:49 When Virtual machine Error Will Occurred in java
2:10:51 Explain OOPS Concepts in Java ?
2:20:02 How many number of Object can be created for class in java ?
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2:33:56 Explain Object creation in java ?
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2:47:49 What is Method in Java ?
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3:18:56 What is Method Overloading in Java ?
3:39:51 How can we Overload Main Method in Java
Can We Overload Main Method in Java ?
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5:16:48 Which all different type of member of a class can be inherited to the sub class?
5:39:10 What will be the process of constructor invocation in super and sub-class?
5:45:06 What is Dynamic Dispatch in Java?
5:47:39 What is method overriding in java?
What is early and late binding in java?
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What is the difference between static and dynamic polymorphism?
6:42:05 What is Abstraction ?
6:47:16 Is that Abstract Class and Abstraction is same?
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8:05:38 What is the Inner Class ?
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Java Interview Questions and Answers for Freshers

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Top 22 Collection Interview Questions and Answers in Java

The collections framework was designed to meet several goals, such as −

The framework had to be high-performance. The implementations for the fundamental collections (dynamic arrays, linked lists, trees, and hashtables) were to be highly efficient.

The framework had to allow different types of collections to work in a similar manner and with a high degree of interoperability.

The framework had to extend and/or adapt a collection easily.

Towards this end, the entire collections framework is designed around a set of standard interfaces. Several standard implementations such as LinkedList, HashSet, and TreeSet, of these interfaces are provided that you may use as-is and you may also implement your own collection, if you choose.

A collections framework is a unified architecture for representing and manipulating collections. All collections frameworks contain the following −

Interfaces − These are abstract data types that represent collections. Interfaces allow collections to be manipulated independently of the details of their representation. In object-oriented languages, interfaces generally form a hierarchy.

Implementations, i.e., Classes − These are the concrete implementations of the collection interfaces. In essence, they are reusable data structures.

Algorithms − These are the methods that perform useful computations, such as searching and sorting, on objects that implement collection interfaces. The algorithms are said to be polymorphic: that is, the same method can be used on many different implementations of the appropriate collection interface.

In addition to collections, the framework defines several map interfaces and classes. Maps store key/value pairs. Although maps are not collections in the proper use of the term, but they are fully integrated with collections.

The Collection Interfaces

The collections framework defines several interfaces. This section provides an overview of each interface −

Sr.No.Interface & Description1The Collection Interface

This enables you to work with groups of objects; it is at the top of the collections hierarchy.

2The List Interface

This extends Collection and an instance of List stores an ordered collection of elements.

3The Set

This extends Collection to handle sets, which must contain unique elements.

4The SortedSet

This extends Set to handle sorted sets.

5The Map

This maps unique keys to values.

6The Map.Entry

This describes an element (a key/value pair) in a map. This is an inner class of Map.

7The SortedMap

This extends Map so that the keys are maintained in an ascending order.

8The Enumeration

This is legacy interface defines the methods by which you can enumerate (obtain one at a time) the elements in a collection of objects. This legacy interface has been superceded by Iterator.

The Collection Classes

Java provides a set of standard collection classes that implement Collection interfaces. Some of the classes provide full implementations that can be used as-is and others are abstract class, providing skeletal implementations that are used as starting points for creating concrete collections.

The standard collection classes are summarized in the following table −

Sr.No.Class & Description1

AbstractCollection

Implements most of the Collection interface.

2

AbstractList

Extends AbstractCollection and implements most of the List interface.

3

AbstractSequentialList

Extends AbstractList for use by a collection that uses sequential rather than random access of its elements.

4LinkedList

Implements a linked list by extending AbstractSequentialList.

5ArrayList

Implements a dynamic array by extending AbstractList.

6

AbstractSet

Extends AbstractCollection and implements most of the Set interface.

7HashSet

Extends AbstractSet for use with a hash table.

8LinkedHashSet

Extends HashSet to allow insertion-order iterations.

9TreeSet

Implements a set stored in a tree. Extends AbstractSet.

10

AbstractMap

Implements most of the Map interface.

11HashMap

Extends AbstractMap to use a hash table.

12TreeMap

Extends AbstractMap to use a tree.

13WeakHashMap

Extends AbstractMap to use a hash table with weak keys.

14LinkedHashMap

Extends HashMap to allow insertion-order iterations.

15IdentityHashMap

Extends AbstractMap and uses reference equality when comparing documents.

The AbstractCollection, AbstractSet, AbstractList, AbstractSequentialList and AbstractMap classes provide skeletal implementations of the core collection interfaces, to minimize the effort required to implement them.

The following legacy classes defined by java.util have been discussed in the previous chapter −

Sr.No.Class & Description1Vector

This implements a dynamic array. It is similar to ArrayList, but with some differences.

2Stack

Stack is a subclass of Vector that implements a standard last-in, first-out stack.

3Dictionary

Dictionary is an abstract class that represents a key/value storage repository and operates m

Top 11 Tricky Java Coding Interview Questions | Java Programming | TalentSprint

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Java Interview Questions and Answers | Core Java Interview Questions | Intellipaat

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Java Interview Questions and Answers | Java Tutorial | Java Online Training | Edureka

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3. At the end of the training you will be working on a real time project for which we will provide you a Grade and a Verifiable Certificate!
- - - - - - - - - - - - - - - - -

About the Course

Edureka's Advanced Java/J2EE and SOA training and certification course is designed for students and professionals who want to be a Java Developer. This is a 42 hour course which will cover both core and advanced Java concepts like Database connectivity, Threads, Exception Handling, Collections, JSP, Servlets, XML Handling etc. We will also learn various Java frameworks like Hibernate and Spring. During our Java/ Certification training, our instructors will help you:

1. Develop the code with various Java data types, conditions and loops.
2. Implement arrays, functions and string handling techniques.
3. Understand object oriented programming through Java using Classes, Objects and various Java concepts like Abstract, Final etc.
4. Implement multi-threading and exception handling.
5. Use parse XML files using DOM and SAX in Java.
6. Write a code in JDBC to communicate with Database.
7. Develop web applications and JSP pages.
8. Interact with the database using hibernate framework.
9. Write code with spring framework components like Dependency Injection and Auto Wiring.
10. Implement SOA using web services.

- - - - - - - - - - - - - - - - - - -

Who should go for this course?

This course is designed for professionals aspiring to become Java Developers. Programmers, Web Developers, Web Designers, Programming Hobbyists, Database Administrators, Youngsters who want to kick start their career are the key beneficiaries of this course.
- - - - - - - - - - - - - - - -

Why learn Java?

Java is a general-purpose, class-based, object-oriented computer programming language that was designed by James Gosling at Sun Microsystems in 1995.

Key Highlights of Java:
Platform Independent: This allows programmers to develop applications that can run on any operating system.

Usability of Java: Java is most widely used programming language. It is present everywhere. It really doesn't matter which domain you are working in, you will surely come across Java sooner or later!

Open Source: The good news is that Java is available for free! All the development tools and the environment (JRE & JDK) that is used to develop Java applications are absolutely free of cost.

Android: Irrespective of the fact that you are tech savvy or not, most of us are badly bitten by the Android bug! Android is in great demand today and fortunately you need Java for Android development. Hence, the importance of Java has increased even more.

Hadoop: Hadoop is one of the most trending framework for processing Big Data. It has been designed and developed in Java.

In spite of having a tough competition on the server side from Microsoft and other companies, Java is doing extremely well on mobile platforms, thanks to Android! It has also been the primary language for Hadoop Developers.

For Java Training and Certification, please write back to us at sales@edureka.in or call us at IND: 9606058406 / US: 18338555775 (toll free).


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Top 12 commonly asked Important Java Interview Questions on OOPs Concepts | TalentSprint

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