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Interview Questions and Answers for 'British telecom (bt)' - 2 question(s) found
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Frequently asked in Infosys and HCL Technologies ( Based on 2 feedback )
Q1.
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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 java   oops   object creation   new operator   class.forname   cloning   ebay
Asked in 9 Companies
expert
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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?
Q2.
Difference between Vector and ArrayList ?
Core Java
Ans. Vectors are synchronized whereas Array lists are not.
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 java   basic interview question   vector   arraylist   collections   synchronization   vector vs arraylist
Asked in 35 Companies
basic
 
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Collections.sort can only be performed on ..
a. Set
b. List
c. Map
d. Any Collection implementation
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