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Q:

What is your Greatest Success?

Answer

This is a good question to highlight your achievements. Don't be smug or arrogant about the success of a project, especially if it was a team effort. You need to give credit to the team, too. You could say what you contributed to the total project and also give credit to others that helped in your success. Don't be overly modest, either.Here are some pointers:


1. Pick something that was clearly a success and highlight your skills.


2. Pick something recent. If you pick something twenty years ago, they are going to wonder what you have done lately.


3. Pick something important. You may have succeeded in many projects that are not that significant. 


4. Pick something easy to explain. If complicated, give the short version.


5. Be sure to explain what you learned from this success.

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Q:

What is dynamic method dispatch?

Answer

Dynamic method dispatch which is also known as runtime polymorphism is a process in which a call to an overridden method is resolved at runtime rather than at compile-time. In this process, an overridden method is called through the reference variable of a superclass. The determination of the method to be called is based on the object being referred to by the reference variable.

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Subject: Java

Q:

What is the similarity between Dynamic Binding and linking?

Answer

Dynamic binding is orthogonal to dynamic linking. Binding refers to the linking of a procedure call to the code to be executed in response to the call. Dynamic binding It is associated with polymorphism and inheritance, it(also known as late binding) means that the code associated with a given procedure call is not known until the time of the call at run-time.

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Subject: Java

Q:

What is the common usage of serialization? What exceptions occur during serialization?

Answer

The object need to be serialized when it’s sent over a network and when it’s state is saved. Exceptions which occur during serialization are:


a. transient fields


b. when the base class is serialized then only base class fields are handled.


c. static fields are ignored because they are not part of any state.

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Subject: Java

Q:

What is Shallow and deep cloning in Java?

Answer

Cloning refers to creating duplicate copies of objects in java.


Shallow Cloning: Shallow cloning is a bitwise copy of an object. New object is created which is an exact copy that of the original one. In case any objects are referring the fields of these objects, just the references are copied.


Deep Cloning: In deep cloning, complete duplicate copy of the original copy is created. Deep cloning creates not only the primitive values of the original objects but also copies all its sub objects as well.


Clonable interface is used to perform cloning in java.

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Subject: Java

Q:

Why do we need wrapper classes in Java?

Answer

Dealing with primitives as objects is easier at times. Most of the objects collection store objects and not primitive types. Many utility methods are provided by wrapper classes. To get these advantages we need to use wrapper classes. As they are objects, they can be stored in any of the collection and pass this collection as parameters to the methods.


 


Features of the Java wrapper Classes:


- Wrapper classes convert numeric strings into numeric values.


- The way to store primitive data in an object.


- The valueOf() method is available in all wrapper classes except Character


- All wrapper classes have typeValue() method. This method returns the value of the object as its primitive type.

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Subject: Java

Q:

How does thread synchronization occurs inside a monitor?

Answer

A Monitor defines a lock and condition variables for managing concurrent access to shared data. The monitor uses the lock to ensure that only a single thread inactive in the monitor code at any time.


A monitor allows only one thread to lock an object at once.

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Subject: Java

Q:

What is Auto boxing and unboxing?

Answer

Autoboxing is the process of converting a primitive type data into its corresponding wrapper class object instance.


Example:


Integer number = new Integer (100); // number is now refers to the object 100


 


Unboxing is the process of converting a wrapper instance into a primitive type.


Example: 


Integer number = new Integer (100); 


int num = number;// without type casting number would be changed into int type

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Subject: Java