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Accenture Java Interview Questions and Answers. Candidate experience 5 years. Package 22 LPA

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In this video of code decode we have covered the experience of one of our colleagues who appeared and cracked Accenture interview. Candidate is having an experience of 5+ years and now serving the notice period


What is Concurrenthashmap and How it Works Internally?
The ConcurrentHashMap class is introduced in JDK 1.5 and belongs to java.util.concurrent package

The underlined data structure for ConcurrentHashMap is Hashtable.

ConcurrentHashMap class is thread-safe i.e. multiple threads can operate on a single object without any complications.

At a time any number of threads are applicable for a read operation without locking the ConcurrentHashMap object which is not there in HashMap.

In ConcurrentHashMap, the Object is divided into a number of segments according to the concurrency level.

The default concurrency-level of ConcurrentHashMap is 16.


How to make a List as Read Only List?
An ArrayList can be made read-only easily with the help of Collections.unmodifiableList() method. This method takes the modifiable ArrayList as a parameter and returns the read-only unmodifiable view of this ArrayList.

readOnlyArrayList = Collections.unmodifiableList(ArrayList);


What Is Java Reflection API?
At run time you have an object, you wanna know details of the class (Blueprint of it) Then use Reflection.

Java Reflection is the process of analyzing and modifying all the capabilities of a class at runtime. Reflection API in Java is used to manipulate class and its members which include fields, methods, constructor, etc. at runtime.

One advantage of reflection API in Java is, it can manipulate private members of the class too.

The required classes for reflection are provided under java.lang.reflect package.

What Is An Object’s Lock And Types of Locks available?


In multithreading environment, two or more threads can access the shared resources simultaneously which can lead the inconsistent behavior of the system. Java uses concept of locks to restrict concurrent access of shared resources or objects. Locks can be applied at two levels -

Object Level Locks - It can be used when you want non-static method or non-static block of the code should be accessed by only one thread.

Class Level locks - It can be used when we want to prevent multiple threads to enter the synchronized block in any of all available instances on runtime. It should always be used to make static data thread safe.

Every object of the class may have their own lock but Multiple objects of class may exist but there is always one class’s class object lock available



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