#Java collections questions how to
#Java collections questions tv
#Java collections questions free

#Java collections questions how to

Read Also: How To Crack Assistant Manager Interview These Are Frequently Asked Java Interview Questions From The Java Collections Framework And You Should Review Them Before Going For Interviews List strList = new ArrayList //using for-each loop }Using iterator is more thread-safe because it makes sure that if underlying list elements are modified, it will throw ConcurrentModificationException. Q25 What Are Different Ways To Iterate Over A ListĪns: We can iterate over a list in two different ways using iterator and using for-each loop. Consider the following syntax to convert the ArrayList to the List object. We can convert an ArrayList to Array using toArray method of the ArrayList class. asList method is the static method of Arrays class and accepts the List object. We can convert an Array to ArrayList by using the asList method of Arrays class. The most common classes of Java used in app development are static, final, concrete, inner, abstract, and POJO. It is commonly used as a blueprint for design in object-oriented languages. What is a Java Class? Can you tell us about some of the common classes of Java?Īnswer: A Java Class is a category for Java objects presenting similar properties or methods. It has made programming more simplified and efficient with functional interfaces to object-oriented interfaces.

#Java collections questions free

It is free for commercial use and has many significant features such as functional interfaces and static methods.

Which, according to you, are the most significant features of Java 8?Īnswer: Most developers have stuck to the 2014 release, Java 8. Here are some of the most commonly asked Java Interview Questions and Answers for 5 years of Experience. We have curated the top Java interview questions for professionals holding 5 yearsâ experience and categorized them according to work experience and important topics such as OOP and thread handling. I recommend reading the additional material indicated in the responses. The theme of the Java collections is incredibly extensive, and in order to answer each question a separate article is deeply needed for almost every question. Java Collections Interview Questions & Answers

#Java collections questions tv

Because CRT TV things can also be done in the Smart TV. So we can say that the Smart iv is also a TV. Now another Smart TV that is inherited from television class. So that relationship is termed an IS-A Relationship.Įxample – Consider a Television. When we inherit the base class from the derived class, then it forms a relationship between the classes. IS-A relationship is another name for inheritance.

When InvalidMonitorStateException is thrown? Why? What Is The Is.

Tell me about frameworks you’ve used to manage to thread?.

Why do you use threading? What are some of the drawbacks of threading?.

Is it possible to call a constructor from another ? If yes, how?.

What is the purpose of a default constructor? When must the developer provide the constructor explicitly?.

When do Double and BigDecimal give different answers for equals and compareTo = 0?.

How do you avoid NullPointerException while comparing two Strings in Java?.

Will two object always be equal when their compareTo method returns zero?.

Why compareTo should be consistent to equals method in Java?.

Can you explain what does substring method do?.

What are the benefits of the immutable objects? Why do you use them, and in which scenarios should you use them?.

Explain the scenarios to choose between String, StringBuilder, and StringBuffer?.

What will be the initial value of an object reference, which is defined as an instance variable?.

Why do you need a marker interface in Java?.

How are interfaces useful, and how are they abused? Narrate one or two ways you’ve used them.

When do you favor abstract class over the interface?.

When do autoboxing and unboxing occur in Java?

Why static method cannot be overridden in Java?.

What if the static modifier is removed from the signature of the main method?.

Why the main method is static? Can we execute a program without the main method? If yes, how?.

Java interview questions and answers for experienced | Live Mock | coding interview