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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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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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Is &&= a valid Java operator
No, it is not.
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Name the eight primitive Java types.The eight primitive types are byte, char, short, int, long, float, double, and boolean.
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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. -
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.
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What event results from the clicking of a button
The ActionEvent event is generated as the result of the clicking of a button.
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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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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.
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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.
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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.
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Which class is the immediate superclass of the Container class
Component
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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 restrictions are placed on method overloading
Two methods may not have the same name and argument list but different return types.
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What happens when you invoke a thread's interrupt method while it issleeping or waiting
When a task's interrupt() method is executed, the task enters the ready state. The nexttime the task enters the running state, an InterruptedException is thrown.
Sandhya.Kishan
- Jul 14th, 2012
Java.lang.InterruptedException is called when we invoke a threads interrupt method while it is sleeping.
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What is casting
There are two types of casting, casting between primitive numeric types and castingbetween object references. Casting between numeric types is used to convert largervalues, such as double values, to smaller values, such as byte values. Casting betweenobject references is used to refer to an object by a compatible class, interface, or arraytype reference.
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Java Interview Questions
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