Interview Questions and Answers for 'British Telecom (BT)' | Search Interview Question

Interview Questions and Answers for 'British Telecom (BT)' - 2 question(s) found - Order By Rating

Q1. Difference between Vector and ArrayList ?

Ans. Vectors are synchronized whereas Array lists are not.

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What is the difference between ArrayList and LinkedList ?

If you are given a choice to use either ArrayList and LinkedList, Which one would you use and Why ?

Difference between HashMap and Hashtable?

Difference between TreeMap and HashMap ?

Can you provide some implementation of a Dictionary having large number of words ?

Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ?

How is Hashmap internally implemented in Java ?

What is a ConcurrentHashMap ?

Collections.sort can only be performed on ..

a. Set
b. List
c. Map
d. Any Collection implementation

Why HashTable has been deprecated ?

Frequently asked in Infosys and HCL Technologies ( Based on 2 feedback )

Q2. What are different ways of object creation in Java ?

Core Java

Ans. Using new operator - new xyzClass()

Using factory methods - xyzFactory.getInstance( )

Using newInstance( ) method - (Class.forName(xyzClass))emp.newInstance( )

By cloning an already available object - (xyzClass)obj1.clone( )

Sample Code for object initialization using clone

Sample Code for object initialization using getInstance

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Describe what happens when an object is created in Java ?

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Difference between Class#getInstance() and new operator ?

In a case where there are no instance variables what does the default constructor initialize?

How can we prevent duplicate object creation in Java?

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