Advanced Java Interview Questions And Answers Pdf

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There is the list of core Java interview questions. If there is any core Java interview question that has been asked to you, kindly post it in the ask question section. The answers to the Core Java interview questions are short and to the point. The core Java interview questions are categorized in Basics of Java interview questions, OOPs interview questions, String Handling interview questions, Multithreading interview questions, collection interview questions, JDBC interview questions, etc.

Top 100 Java Interview Questions and Answers (Download PDF)

Java object is an object that is provided by the execution of an application. When an application is compiled an object of that application is being made. Java application on the other hand is a program that is being written in Java and being read by the Java virtual machine. What is the purpose of garbage collection in Java, and when is it used?

The purpose of garbage collection is to identify and discard objects that are no longer needed by a program so that their resources can be reclaimed and reused. A Java object is subject to garbage collection when it becomes unreachable to the program in which it is used. Advantages of Java Sockets: - Sockets are flexible and easy to implement for general communications.

Disadvantages of Java Sockets: - Socket based communications allows only to send packets of raw data between applications.

With respect to multithreading, synchronization is the capability to control the access of multiple threads to shared resources. Without synchronization, it is possible for one thread to modify a shared variable while another thread is in the process of using or updating the same shared variable.

This usually leads to significant errors. The thread could be implemented by using a runnable interface or by inheriting from the Thread class. The former is more advantageous, 'cause when you are going for multiple inheritances. Pass By Reference means passing the address itself rather than passing the value. Passby Value means passing a copy of the value to be passed.

What is the difference between ArrayList and vector? ArrayList is not thread-safe whereas Vector is thread-safe. What is HashMap and Map? The HashMap class is roughly equivalent to Hashtable, except that it is unsynchronized and permits nulls. HashMap allows null values as key and value whereas Hashtable doesn't allow. HashMap does not guarantee that the order of the map will remain constant over time.

HashMap is unsynchronized and Hashtable is synchronized. A constructor is a member function of a class that is used to create objects of that class.

It has the same name as the class itself, has no return type, and is invoked using the new operator. A method is an ordinary member function of a class. It has its own name, a return type which may be void , and is invoked using the dot operator. Some of the collection classes provide traversal of their contents via a java.

Iterator interface. This interface allows you to walk through a collection of objects, operating on each object in turn. Remember when using Iterators that they contain a snapshot of the collection at the time the Iterator was obtained; generally it is not advisable to modify the collection itself while traversing an Iterator. Multitasking includes two ways for representation: 1.

Preemptive multitasking: where the system terminates the idle process without asking the user. Non-preemptive multitasking : where the system asks the process to give control to other processes for execution.

For example Windows 3. Multithreading: 1. Multithreaded programs are the program that extends the functionality of multitasking by dividing the program in the thread and then execute the task as individual threads. Threads run in a different area and each thread utilizes some amount of CPU and memory for execution. What is the difference between an Interface and an Abstract class? An abstract class can have instance methods that implement a default behavior.

An Interface can only declare constants and instance methods, but cannot implement default behavior and all methods are implicitly abstract. An interface has all public members and no implementation.

An abstract class is a class which may have the usual flavors of class members private, protected, etc. What is the difference between multiple processes and multiple threads? Multiple processes are the way to provide a multitasking environment to the user to allow him to switch over to different programs quickly. In these processes, it consists of a complete set of its own variables and data. Multiple threads share the same variable and the same data. Multiple processes are safe to use but multiple threads are riskier in the sense that they share the same data.

It serves as a template. A class that is abstract may not be instantiated ie, you may not call its constructor , an abstract class may contain static data. Any class with an abstract method is automatically abstract itself and must be declared as such. A class may be declared abstract even if it has no abstract methods. This prevents it from being instantiated.

Static means one per class, not one for each object no matter how many instances of a class might exist. This means that you can use them without creating an instance of a class.

Static methods are implicitly final, because overriding is done based on the type of the object, and static methods are attached to a class, not an object. A static method in a superclass can be shadowed by another static method in a subclass, as long as the original method was not declared final.

However, you can't override a static method with a nonstatic method. In other words, you can't change a static method into an instance method in a subclass. A final class can't be extended ie. A final method can't be overridden when its class is inherited.

You can't change the value of a final variable is a constant. The program compiles properly but at runtime, it will give a "Main method not public.

What if the static modifier is removed from the signature of the main method? What if I do not provide the String array as the argument to the method? The String array is empty. It does not have any element. If I do not provide any arguments on the command line, then the String array of Main method will be empty or null? How can one prove that the array is not null but empty using one line of code?

Print args. It will print 0. That means it is empty. But if it would have been null then it would have thrown a NullPointerException on attempting to print args. Yes, it is possible. While starting the application we mention the class name to be run. The JVM will look for the Main method only in the class whose name you have mentioned.

Hence there is no conflict amongst the multiple classes having the main method. No, the program fails to compile. The compiler says that the main method is already defined in the class. Will the JVM load the package twice at runtime? One can import the same package or same class multiple times. Neither compiler nor JVM complains abt it. And the JVM will internally load the class only once no matter how many times you import the same class.

A checked exception is some subclass of Exception or Exception itself , excluding class RuntimeException and its subclasses. Making an exception checked forces client programmers to deal with the possibility that the exception will be thrown. Class Error and its subclasses also are unchecked. With an unchecked exception, however, the compiler doesn't force client programmers either to catch the exception or declare it in a throws clause.

In fact, client programmers may not even know that the exception could be thrown. Runtime exceptions do not need to be.

Errors often cannot be. When a class defines a method using the same name, return type, and arguments as a method in its superclass, the method in the class overrides the method in the superclass. When the method is invoked for an object of the class, it is the new definition of the method that is called and not the method definition from the superclass.

Methods may be overridden to be more public, not more private. Nested top-level classes, Member classes, Local classes, Anonymous classes Nested top-level classes- If you declare a class within a class and specify the static modifier, the compiler treats the class just like any other top-level class.

Any class outside the declaring class accesses the nested class with the declaring class name acting similarly to a package. Top-level inner classes implicitly have access only to static variables. There can also be inner interfaces. All of these are of the nested top-level variety. Member classes - Member inner classes are just like other member methods and member variables and access to the member class is restricted, just like methods and variables. This means a public member class acts similarly to a nested top-level class.

60 Advanced Java Interview Questions

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The main distinction between fail-fast and fail-safe iterators is whether or not the collection can be modified while it is being iterated. Fail-safe iterators allow this; fail-fast iterators do not. Fail-fast iterators operate directly on the collection itself. During iteration, fail-fast iterators fail as soon as they realize that the collection has been modified i. Fail-safe iterates operate on a cloned copy of the collection and therefore do not throw an exception if the collection is modified during iteration. Which of them is most efficient for adding and removing elements from the list? Explain your answer, including any other alternatives you may be aware of.

These interview questions and answers on Advanced Java will help you strengthen Interview preparation PDF was generated at Monday 12th January,

Advanced Java Interview Questions for Freshers and Experienced

Download PDF We have compiled the most frequently asked Java Interview Questions and Answers that will help you prepare for the Basic Java interview questions that an interviewer might ask you during your interview. In this list of Basic Java interview questions, we have covered all commonly asked basic and advanced Core Java interview questions with detailed answers to help you clear the job interview. The following list contains important Core Java interview questions for freshers as well as Java interview questions and answers for experienced programmers to help them prepare for the interview. This detailed guide of interview questions for Java Programming will help you to crack your Job interview easily.

100+ Java Interview Questions You Must Prepare In 2021

Advanced Java Interview Questions are very important, especially, for experienced java developers. In addition to reading the questions, we recommend watching these two interview preparation videos covering important core java questions. Variable Arguments allow calling a method with different number of parameters. Consider the example method sum below. This sum method can be called with 1 int parameter or 2 int parameters or more int parameters. Assertions are introduced in Java 1.

Preparing for a Java interview? Here are the top Java interview questions that you should know — and how to answer them. Whether you are going to a junior Java developer interview or a senior Java developer interview, use these commonly-asked interview questions and answers to help you successfully land the job! Need to interview a Java developer for a freelance project or job?

Solved examples with detailed answer description, explanation are given and it would be easy to understand. View the solution for the problems with feel and good user interface; easily go through all questions and answers. You can easily answer the interview questions based on Advanced Java by practicing the exercises given below. All Rights Reserved. Contact us: info.

All students, freshers can download Advanced Java quiz questions with answers as PDF files and eBooks. Solved examples with detailed answer description.

Java object is an object that is provided by the execution of an application. When an application is compiled an object of that application is being made. Java application on the other hand is a program that is being written in Java and being read by the Java virtual machine. What is the purpose of garbage collection in Java, and when is it used?

Wrapped classes are classes that allow primitive types to be accessed as objects. A class is a definition or prototype whereas an object is an instance or living representation of the prototype. Just-In-Time compiler is a program that runs Java bytecode, which is a program that contains instructions that must be interpreted into instructions that can be sent directly to the processor. JIT compiles parts of the byte code that have similar functionality at the same time, and hence reduces the amount of time needed for compilation.


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