Advanced java interview questions and answers for freshers pdf

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All students, freshers can download Advanced Java quiz questions with answers as PDF files and eBooks. Solved examples with detailed answer description. Dear readers, these Java Interview Questions have been designed especially to get you the subject and later they continue based on further discussion and what you answer − .. to be very useful if you don't know the size of the array in advance, or you just need .. If you are fresher then interviewer does not expect you. Freshers / exp can download Questions and Answers PDF here. So, job seekers go through the Advanced Java Interview Questions PDF.

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These interview questions and answers on Advanced Java will help you strengthen Interview preparation PDF was generated at Monday 12th January, Top 50 Advanced Java Interview Questions and Answers. In-depth guide with answers to wow the interviewer. Bonus: 20+ Videos & PDF interview guide. Drawable shape resource · Home > advanced java interview questions and answers pdf Java Interview Questions for Fresher Experience.

These set of Java Interview Questions will definitely help you ace your job interview. Consider the example method sum below. Void defines the method which will not return any value. Array List can only use Iterator for traversing an Array List. How to answer Advanced Java interview questions? Compile time polymorphism is method overloading whereas Runtime time polymorphism is done using inheritance and interface. An Interface cannot have instance variables An abstract class can have any visibility:

Objects stored in the heap are globally accessible. Memory management is based on generation associated to each object.

Questions freshers for pdf advanced and java answers interview

Lifetime Exists until the end of execution of the thread. Heap memory lives from the start till the end of application execution.

advanced java interview questions and answers pdf

Usage Stack memory only contains local primitive and reference variables to objects in heap space. In case you are facing any challenges with these java interview questions, please comment on your problems in the section below. An interface cannot provide any code at all,just the signature.

In case of abstract class, a class may extend only one abstract class. A Class may implement several interfaces.

An abstract class can have non-abstract methods. All methods of an Interface are abstract.

Advanced Java Interview Questions for Freshers and Experienced

An abstract class can have instance variables. An Interface cannot have instance variables An abstract class can have any visibility: An Interface visibility must be public or none. If we add a new method to an abstract class then we have the option of providing default implementation and therefore all the existing code might work properly If we add a new method to an Interface then we have to track down all the implementations of the interface and define implementation for the new method An abstract class can contain constructors An Interface cannot contain constructors Abstract classes are fast Interfaces are slow as it requires extra indirection to find corresponding method in the actual class.

Get Post Limited amount of data can be sent because data is sent in header. Large amount of data can be sent because data is sent in body.

Not Secured because data is exposed in URL bar. Secured because data is not exposed in URL bar. Forward method SendRedirect method forward sends the same request to another resource. They enable you to validate assumptions. If an assert fails i. Basic assert is shown in the example below.

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Assertions should not be used to validate input data to a public method or command line argument. IllegalArgumentException would be a better option. In public method, only use assertions to check for cases which are never supposed to happen.

Garbage Collection is a name given to automatic memory management in Java. Aim of Garbage Collection is to Keep as much of heap available free for the program as possible. JVM removes objects on the heap which no longer have references from the heap. An object of the class GregorianCalendar is created on the heap by the first line of the function with one reference variable calendar.

Freshers and questions java pdf for advanced interview answers

After the function ends execution, the reference variable calendar is no longer valid. Hence, there are no references to the object created in the method.

Garbage Collection runs at the whims and fancies of the JVM it isn't as bad as that. Possible situations when Garbage Collection might run are.

And questions for pdf answers java advanced interview freshers

JVM might throw an OutOfMemoryException when memory is full and no objects on the heap are eligible for garbage collection. We recommend not to write any code in finalize ;.

Java for questions freshers answers pdf interview and advanced

Look at the example below: This is run only when class is first loaded. Only static variables can be accessed in a static initializer. Even though three instances are created static initializer is run only once.

Top 75 Java Interview Questions You Must Prepare In 2019

Code within instance initializer is run every time an instance of the class is created. Regular Expressions make parsing, scanning and splitting a string very easy. We will first look at how you can evaluate a regular expressions in Java — using Patter, Matcher and Scanner classes.

We will then look into how to write a regular expression. Tokenizing means splitting a string into several sub strings based on delimiters. For example, delimiter ; splits the string ac;bd;def;e into four sub strings ac, bd, def and e. Lets now look at adding a few hours to a date object.