Q: What is the Collections API?
A: The Collections API is a set of classes and interfaces that support operations on collections of objects.
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Q: What is the List interface?
A: The List interface provides support for ordered collections of objects.
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Q: What is the Vector class?
A: The Vector class provides the capability to implement a growable array of objects.
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Q: What is an Iterator interface?
A: The Iterator interface is used to step through the elements of a Collection .
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Q: Which java.util classes and interfaces support event handling?
A: The EventObject class and the EventListener interface support event processing.
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Q: What is the GregorianCalendar class?
A: The GregorianCalendar provides support for traditional Western calendars
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Q: What is the Locale class?
A: The Locale class is used to tailor program output to the conventions of a particular geographic, political, or cultural region .
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Q: What is the SimpleTimeZone class?
A: The SimpleTimeZone class provides support for a Gregorian calendar .
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Q: What is the Map interface?
A: The Map interface replaces the JDK 1.1 Dictionary class and is used associate keys with values.
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Q: What is the highest-level event class of the event-delegation model?
A: The java.util.EventObject class is the highest-level class in the event-delegation class hierarchy.
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Q: What is the Collection interface?
A: 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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Q: What is the Set interface?
A: The Set interface provides methods for accessing the elements of a finite mathematical set. Sets do not allow duplicate elements.
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Q: What is the typical use of Hashtable?
A: Whenever a program wants to store a key value pair, one can use Hashtable.
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Q: 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?
A: The existing object will be overwritten and thus it will be lost.
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Q: What is the difference between the size and capacity of a Vector?
A: 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.
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Q: Can a vector contain heterogenous objects?
A: Yes a Vector can contain heterogenous objects. Because a Vector stores everything in terms of Object.
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Q: Can a ArrayList contain heterogenous objects?
A: Yes a ArrayList can contain heterogenous objects. Because a ArrayList stores everything in terms of Object.
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Q: What is an enumeration?
A: 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.