Tuesday, 24 April 2012

JAVA interview questions 4

Q31. Which containers use a FlowLayout as their defaultlayout? 
The Panel and Applet classes use the FlowLayout as their default layout. 

Q32. What state does a thread enter when it terminates itsprocessing? 
When a thread terminates its processing, it enters the dead state. 

Q33. What is the Collections API? 
The Collections API is a set of classes and interfaces that support operations on collections of objects. 

Q34. Which characters may be used as the second character 
of an identifier, but not as the first character of anidentifier? 
The digits 0 through 9 may not be used as the first character of an identifier but they may be used after the first character of an identifier. 

Q35. What is the List interface? 
The List interface provides support for ordered collections of objects. 

Q36. How does Java handle integer overflows andunderflows? 
It uses those low order bytes of the result that can fit into the size of the type allowed by the operation. 

Q37. What is the Vector class? 
The Vector class provides the capability to implement a growable array of objects 

Q38. What modifiers may be used with an inner class that isa member of an outer class? 
A (non-local) inner class may be declared as public, protected, private, static, final, or abstract. 

Q39. What is an Iterator interface? 
The Iterator interface is used to step through the elements of a Collection. 

Q40. What is the difference between the >> and >>>operators? 
The >> operator carries the sign bit when shifting right. The >>> zero-fills bits that have been shifted out.

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