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JAVA UTILS FREQUENTLY ASKED QUESTIONS AND ANSWERS


JAVA UTILS FREQUENTLY ASKED QUESTIONS AND ANSWERS

JAVA UTILS

Question: What is the Collections API?  
Answer:   The Collections API is a set of classes and interfaces that support operations on collections of objects 

Question: What is the List interface?  
Answer:   The List interface provides support for ordered collections of objects. 

Question: What is the Vector class?  
Answer:   The Vector class provides the capability to implement a growable array of objects 

Question: What is an Iterator interface?  
Answer:   The Iterator interface is used to step through the elements of a Collection 

Question: Which java.util classes and interfaces support event handling?  
Answer:   The EventObject class and the EventListener interface support event processing 

Question: What is the GregorianCalendar class?  
Answer:   The GregorianCalendar provides support for traditional Western calendars 

Question: What is the Locale class?  
Answer:   The Locale class is used to tailor program output to the conventions of a particular geographic, political, or cultural region 

Question: What is the SimpleTimeZone class?  
Answer:   The SimpleTimeZone class provides support for a Gregorian calendar 

  
Question: What is the Map interface?  
Answer:   The Map interface replaces the JDK 1.1 Dictionary class and is used associate keys with values 

Question: What is the highest-level event class of the event-delegation model?  
Answer:   The java.util.EventObject class is the highest-level class in the event-delegation class hierarchy 

Question: What is the Collection interface?  
Answer:   The Collection interface provides support for the implementation of a mathematical bag - an unordered collection of objects that may contain duplicates 

Question: What is the Set interface?  
Answer:   The Set interface provides methods for accessing the elements of a finite mathematical set. Sets do not allow duplicate elements 

Question: What is the purpose of the enableEvents() method?  
Answer:   The enableEvents() method is used to enable an event for a particular object. Normally, an event is enabled when a listener is added to an object for a particular event. The enableEvents() method is used by objects that handle events by overriding their event-dispatch methods. 

Question: What is the ResourceBundle class?  
Answer:   The ResourceBundle class is used to store locale-specific resources that can be loaded by a program to tailor the program's appearance to the particular locale in which it is being run.