1) What is the Collections API?
A: The Collections API is a set of classes and interfaces that support operations on collections of objects.
2) What is the List interface?
A: The List interface provides support for ordered collections of objects.
3) What is the Vector class?
A: The Vector class provides the capability to implement a growable array of objects.
4) What is an Iterator interface?
A: The Iterator interface is used to step through the elements of a Collection .
5) Which java.util classes and interfaces support event handling?
A: The EventObject class and the EventListener interface support event processing.
6) What is the GregorianCalendar class?
A: The GregorianCalendar provides support for traditional Western calendars
7) 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 .
8) What is the SimpleTimeZone class?
A: The SimpleTimeZone class provides support for a Gregorian calendar .
9) What is the Map interface?
A: The Map interface replaces the JDK 1.1 Dictionary class and is used associate keys with values.
10) 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.
11) 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.
12) 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.
13) What is the typical use of Hashtable?
A: Whenever a program wants to store a key value pair, one can use Hashtable.
14) 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.
15) Can a vector contain heterogenous objects?
A: Yes a Vector can contain heterogenous objects. Because a Vector stores everything in terms of Object.
A: The Collections API is a set of classes and interfaces that support operations on collections of objects.
2) What is the List interface?
A: The List interface provides support for ordered collections of objects.
3) What is the Vector class?
A: The Vector class provides the capability to implement a growable array of objects.
4) What is an Iterator interface?
A: The Iterator interface is used to step through the elements of a Collection .
5) Which java.util classes and interfaces support event handling?
A: The EventObject class and the EventListener interface support event processing.
6) What is the GregorianCalendar class?
A: The GregorianCalendar provides support for traditional Western calendars
7) 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 .
8) What is the SimpleTimeZone class?
A: The SimpleTimeZone class provides support for a Gregorian calendar .
9) What is the Map interface?
A: The Map interface replaces the JDK 1.1 Dictionary class and is used associate keys with values.
10) 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.
11) 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.
12) 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.
13) What is the typical use of Hashtable?
A: Whenever a program wants to store a key value pair, one can use Hashtable.
14) 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.
15) 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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