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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.
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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.
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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. -
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.
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What state is a thread in when it is executing
An executing thread is in the running state.
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Which class is the immediate superclass of the Container class
Component
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What is the difference between a public and a non-public class
A public class may be accessed outside of its package. A non-public class may not beaccessed outside of its package.
Sandhya.Kishan
- Mar 31st, 2012
A public class will have access specifier "public" and its members can be accessed with in and out of the class in which they are specified. A class which doesnt have the public access specifier are c...
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What is the purpose of a statement block
A statement block is used to organize a sequence of statements as a single statementgroup.
Sandhya.Kishan
- Mar 31st, 2012
Sequence of statements are organized as a single statement group with the help of statement block.
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What methods are used to get and set the text label displayed by a Button object
getLabel() and setLabel()
Sandhya.Kishan
- Mar 31st, 2012
To set the text label displayed by a Button object we use the method "button.setLabel(label).
To get the text label displayed by a Button object we use the method "button.getLabel(). -
How can the Checkbox class be used to create a radio button
By associating Checkbox objects with a CheckboxGroup.
Sandhya.Kishan
- Apr 3rd, 2012
Radio Buttons are created by creating a Checkbox first hence it is followed by adding Radio Button in the Checkbox.
JRadioButton of swing class is used to create Radio Button. -
Which non-Unicode letter characters may be used as the first characterof an identifier
The non-Unicode letter characters $ and _ may appear as the first character of anidentifier
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What is the difference between a Choice and a List
A Choice is displayed in a compact form that requires you to pull it down to see the listof available choices. Only one item may be selected from a Choice. A List may bedisplayed in such a way that several List items are visible. A List supports the selectionof one or more List items.
Sandhya.Kishan
- Apr 3rd, 2012
Choice is an action of choosing or selection,it requires us to pull it down to see the list of available choices.Only one item can be choosen from the list of choices.
Several list items are visible in a list and more then one item can be selected using list. -
What an I/O filter
An I/O filter is an object that reads from one stream and writes to another, usuallyaltering the data in some way as it is passed from one stream to another.
Sandhya.Kishan
- Apr 3rd, 2012
An object which is used to read from one stream and write those on other stream is known as an i/o filter.
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What is the Set interface
The Set interface provides methods for accessing the elements of a finite mathematicalset. Sets do not allow duplicate elements.
Sandhya.Kishan
- Apr 3rd, 2012
The Set interface contains only methods that are inherited from a Collection interface and does not allow the addition of duplicate elements.Two Set instances are equal if they contain the same elements.
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What are E and PI
E is the base of the natural logarithm and PI is mathematical value pi.
Sandhya.Kishan
- Apr 3rd, 2012
"e" is a numerical constant that is equal to 2.71828.The value of "e" is found in many mathematical formulas such as those describing a nonlinear increase or decrease such as growth or decay."e" is us...
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What class allows you to read objects directly from a stream
The ObjectInputStream class supports the reading of objects from input streams.
Sandhya.Kishan
- Apr 3rd, 2012
The ObjectInputStream class supports to read object directly from stream.
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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...
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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.
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What happens when you add a double value to a String
The result is a String object.
Sandhya.Kishan
- Apr 5th, 2012
The result of adding a double value to a string is a "string object" .
When we add double value to a string the value gets converted and it is appends to the original string and hence a new string object is created. -
What is the List interface
The List interface provides support for ordered collections of objects.
Sandhya.Kishan
- Apr 5th, 2012
The behavior of the collection of objects is indicated by a list interface.It is an extension of collection interface.It allows one or more and duplicate objects to be null.
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