-
What is the difference between the Reader/Writer class hierarchy and theInputStream/OutputStream class hierarchy
The Reader/Writer class hierarchy is character-oriented, and theInputStream/OutputStream class hierarchy is byte-oriented.
Sandhya.Kishan
- May 7th, 2012
Character-oriented hierarchy is supported by reader/writer class where as byte-oriented hierarchy is supported by
InputStream/OutputStream class. -
If a class is declared without any access modifiers, where may the class be accessed
A class that is declared without any access modifiers is said to have package access. Thismeans that the class can only be accessed by other classes and interfaces that are definedwithin the same package.
Chielo
- Apr 10th, 2007
If a class declared without an access modifier,It will have what called a Default access, and can be access by members in the package.It is worthwhile to note the difference between the Default and Protected modifier as it can be confusing
-
What is the SimpleTimeZone class
The SimpleTimeZone class provides support for a Gregorian calendar.
Sandhya.Kishan
- Mar 24th, 2012
Time zone that is use with a Gregorian calendar is a subclass of TimeZone which represented by SampleTimeZone class.By using the base time zone offset from GMT time zone ID and rules, for starting and ending the time of daylight we create SampleTimeZone class.
-
What is the Map interface
The Map interface replaces the JDK 1.1 Dictionary class and is used associate keys withvalues.
Prabhas270
- Jul 5th, 2008
Hi There, Map is one of the datastuctures provided by Sun.Map is an interface ,it is not extending from Collection interface as like List,Set,Queue does.There are 4 Classes which are implemented ...
-
For which statements does it make sense to use a label
The only statements for which it makes sense to use a label are those statements that canenclose a break or continue statement.
sharmawithu
- Aug 27th, 2011
A label is used to recognize particular area where we need to keep the break. Example: Suppose in one area you are expecting an exception then you'll keep the break then after that particular functi...
-
What is the purpose of the System class
The purpose of the System class is to provide access to system resources.
Sandhya.Kishan
- Mar 27th, 2012
The purpose is that it provide access to externally defined properties and environment variables.It is used to read the system properties.
By using this class we can read time, and date, current running process,current Runtime.
-
Which TextComponent method is used to set a TextComponent to the read-onlystate
setEditable()
Sandhya.Kishan
- Apr 3rd, 2012
SetEditable() is the method used to set text component to read only status.
-
How are the elements of a CardLayout organized
The elements of a CardLayout are stacked, one on top of the other, like a deck of cards.
-
Is &&= a valid Java operator
No, it is not.
-
Name the eight primitive Java types.The eight primitive types are byte, char, short, int, long, float, double, and boolean.
-
What is the relationship between clipping and repainting
When a window is repainted by the AWT painting thread, it sets the clipping regions tothe area of the window that requires repainting.
Sandhya.Kishan
- Mar 29th, 2012
Confining the paint operation to a particular ares or shape is done be a process called ad clipping.
On the request of repainting the clipped areas are set to repaint windows. -
Is "abc" a primitive value
The String literal "abc" is not a primitive value. It is a String object.
nik7i
- Aug 28th, 2011
Yes it is an object, by default string literals has treated as string object...
to prove it:
string s = "hello";
S.o.p(s.length);
string s= new string("hello");
S.o.p(s.length);
both have similar output that shows both are objects.. -
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 classhierarchy.
Sandhya.Kishan
- Mar 29th, 2012
The highest level classof event delegation model is java.util.EventObject class because it contains all classes and interfaces that support all kinds of event handlings.
-
What event results from the clicking of a button
The ActionEvent event is generated as the result of the clicking of a button.
-
How can a GUI component handle its own events
A component can handle its own events by implementing the required event-listenerinterface and adding itself as its own event listener.
Sandhya.Kishan
- Apr 3rd, 2012
By implementing the required event listener interface a gui component can handle it own event.In order to keep a track of all events associated with it uses its own event listener.A program catches an...
-
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.
sujatham
- Aug 2nd, 2007
A basic interface that defines the normal operations that allow a collection of objects to be maintained or handled as a single unit.
-
What is the purpose of the File class
The File class is used to create objects that provide access to the files and directories of alocal file system.
Sandhya.Kishan
- Mar 24th, 2012
File class is used to provide methods to perform some basic file-system operations such as checking the file length,
create/remove folders etc.File class is used to read and write data to and from files.It provides access to directories of local file system with the help of objects created. -
Can an exception be rethrown
Yes, an exception can be rethrown.
Sandhya.Kishan
- Mar 27th, 2012
Exceptions can be re-thrown.Rethrowing the exception is useful if we want to log the same exception, but not to handle it.
-
Which Math method is used to calculate the absolute value of a number
The abs() method is used to calculate absolute values.
Sandhya.Kishan
- Mar 24th, 2012
To returns the absolute value of a specified number we use the method abs(x).
Example:
int value1 = -1000;
int abs1 = Math.Abs(value1);
output will be 1000 which is an absolute value.
-
Which class is the immediate superclass of the Container class
Component
Java Interview Questions
Ans