Tcs Java Questions
What is the Collections API?
What is the List interface?
What is the Vector class?
What is an Iterator interface?
Which java.util classes and interfaces support event handling?
What is the GregorianCalendar class?
What is the Locale class?
What is the SimpleTimeZone class?
What is the Map interface?
What is the highest-level event class of the event-delegation model?
What is the Collection interface?
What is the Set interface?
What is the typical use of Hashtable?
I am trying to store an object using a key in a Hashtable. And some
other object already exists in that location, then what will happen? The
existing object will be overwritten? Or the new object will be stored elsewhere?
What is the difference between the size and capacity of a Vector?
Can a vector contain heterogenous objects?
What is the Collections API?
The Collections API is a set of
classes and interfaces that support operations on collections of objects.
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What is the List interface?
The List interface provides
support for ordered collections of objects.
What is the Vector class?
The Vector class provides the
capability to implement a growable array of objects.
What is an Iterator interface?
The Iterator interface is used to
step through the elements of a Collection .
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Which java.util classes and interfaces support event handling?
The EventObject class and the
EventListener interface support event processing.
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What is the GregorianCalendar class?
The GregorianCalendar provides
support for traditional Western calendars
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What is the Locale class?
The Locale class is used to
tailor program output to the conventions of a particular geographic, political,
or cultural region .
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What is the SimpleTimeZone class?
The SimpleTimeZone class provides
support for a Gregorian calendar .
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What is the Map interface?
The Map interface replaces the
JDK 1.1 Dictionary class and is used associate keys with values.
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What is the highest-level event class of the event-delegation model?
The java.util.EventObject class
is the highest-level class in the event-delegation class hierarchy.
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What is the Collection interface?
The Collection interface provides
support for the implementation of a mathematical bag - an unordered collection
of objects that may contain duplicates.
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What is the Set interface?
The Set interface provides
methods for accessing the elements of a finite mathematical set. Sets do not
allow duplicate elements.
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What is the typical use of Hashtable?
Whenever a program wants to store
a key value pair, one can use Hashtable.
I am trying to store an object using a key in a Hashtable. And some
other object already exists in that location, then what will happen? The
existing object will be overwritten? Or the new object will be stored
elsewhere?
The existing object will be
overwritten and thus it will be lost.
What is the difference between the size and capacity of a Vector?
The size is the number of
elements actually stored in the vector, while capacity is the maximum number of
elements it can store at a given instance of time.
Can a vector contain heterogenous objects?
Yes a Vector can contain
heterogenous objects. Because a Vector stores everything in terms of Object.
Can a ArrayList contain heterogenous objects?
Yes a ArrayList can contain
heterogenous objects. Because a ArrayList stores everything in terms of Object.
What is an enumeration?
An enumeration is an interface
containing methods for accessing the underlying data structure from which the
enumeration is obtained. It is a construct which collection classes return when
you request a collection of all the objects stored in the collection. It allows
sequential access to all the elements stored in the collection.
Considering the basic properties of Vector and ArrayList, where will
you use Vector and where will you use ArrayList?
The basic difference between a
Vector and an ArrayList is that, vector is synchronized while ArrayList is not.
Thus whenever there is a possibility of multiple threads accessing the same
instance, one should use Vector. While if not multiple threads are going to
access the same instance then use ArrayList. Non synchronized data structure
will give better performance than the synchronized one.
Can a vector contain heterogenous objects?
Yes a Vector can contain
heterogenous objects. Because a Vector stores everything in terms of Object.
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