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What is the purpose of the System class
The purpose of the System class is to provide access to system resources.
jimmy514in
- May 18th, 2010
System class can be used to get the properties of the JVMcan be used to get the runtime instance.can be used to call the garbage collection
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Which TextComponent method is used to set a TextComponent to the readonlystate
setEditable()
Sandhya.Kishan
- May 17th, 2012
The text component method which is used to set a textcomponent to the read only state is setEditable() method.
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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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Which class should you use to obtain design information about an object
The Class class is used to obtain information about an object's design.
jimmy514in
- May 18th, 2010
Reflection can be used to get the information about the class methods and properties.
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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 thewindow that requires repainting.
Sandhya.Kishan
- Jul 31st, 2012
Clipping regions are set to the repinted window on the area that requires repainting.When a window is repainted by the AWT painting thread, it sets the clipping regions tothe area of the window that requires repainting.
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What restrictions are placed on the values of each case of a switch statement
During compilation, the values of each case of a switch statement must evaluate to avalue that can bepromoted to an int value.
Sandhya.Kishan
- Jul 31st, 2012
1.The compiler does not initialize auto and register variables at the beginning of a switch body where as we can put data definitions at the beginning of the switch body.
2.We cannot use a switch statement to jump over initializations. -
What modifiers may be used with an interface declaration
An interface may be declared as public or abstract.
Sandhya.Kishan
- Jul 23rd, 2012
The public and abstract modifiers can be used with an interface declaration.
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Is a class a subclass of itself
A class is a subclass of itself.
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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
- Jun 2nd, 2012
Java.util.Eventobject is the highest level event class of the event delegation model.
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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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What is the difference between a while statement and a do statement
A while statement checks at the beginning of a loop to see whether the next loop iterationshould occur. Ado statement checks at the end of a loop to see whether the next iteration of a loop shouldoccur. The dostatement will always execute the body of a loop at least once.
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What is the Collection interface
The Collection interface provides support for the implementation of a mathematical bag -an unorderedcollection of objects that may contain duplicates.
Sandhya.Kishan
- Jul 31st, 2012
The Collection interface is used to pass around collections of objects where maximum generality is desired.It is one of the root interfaces of the Java collection classes.It provides support for the implementation of an unordered collection of objects that may contain duplicates.
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What modifiers can be used with a local inner class
A local inner class may be final or abstract.
Sandhya.Kishan
- Jul 23rd, 2012
The public,private, abstract, final, protected, strictfp and static modifiers can be used with a local inner class.
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What is the difference between the paint() and repaint() methods
The paint() method supports painting via a Graphics object. The repaint() method is usedto cause paint() tobe invoked by the AWT painting thread.
Sandhya.Kishan
- Jul 31st, 2012
Whenever the window needs to be refreshed the paint() method is called automatically.The user does not specify the paint(). The user specifies the repaint() in order to obtain a rendering.repaint() i...
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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
- May 16th, 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
- May 16th, 2012
An exception can be rethrown by using keyword throw.
Example:
try {
// code here that throws an Exception
}
catch (Throwable t) {
throw t; // (re)throw it in their face
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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
- May 16th, 2012
The math method used to calculate the absolute value of a number is abs() method.
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When is the finally clause of a try-catch-finally statement executed
The finally clause of the try-catch-finally statement is always executed unless the threadof executionterminates or an exception occurs within the execution of the finally clause.
Sandhya.Kishan
- Jul 31st, 2012
The finally clause of a try-catch-finally statement executed when the thread of execution terminates or an exception occurs within the execution of the finally clause.
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