Wednesday, 25 April 2012

JAVA interview questions 9

Q81. What is the argument type of a program's main()method? 
A program's main () method takes an argument of the String[] type. 

Q82. Which Java operator is right associative? 
The = operator is right associative. 

Q83. 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. 

Q84. Can a double value be cast to a byte? 
Yes, a double value can be cast to a byte. 

Q85. What is the difference between a break statement anda continue statement? 
A break statement results in the termination of the statement to which it applies (switch, for, do, or while). A continue statement is used to end the current loop iteration and return control to the loop statement. 

Q86. What must a class do to implement an interface? 
It must provide all of the methods in the interface and identify the interface in its implements clause. 

Q87. What method is invoked to cause an object to beginexecuting as a separate thread? 
The start() method of the Thread class is invoked to cause an object to begin executing as a separate thread. 

Q88. Name two subclasses of the TextComponent class. 
TextField and TextArea 

Q89. What is the advantage of the event-delegation modelover the earlier eventinheritance model? 
The event-delegation model has two advantages over the event-inheritance model. First, it 
enables event handling to be handled by objects other than the ones that generate the events (or their containers). This allows a clean separation between a component's design and its use. The other advantage of the event-delegation model is that it performs much better in applications 
where many events are generated. This performance improvement is due to the fact that the 
event-delegation model does not have to repeatedly process unhandled events, as is the case of the event-inheritance model. 

Q90. Which containers may have a MenuBar? 

No comments:

Post a Comment