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What is the range of the char type
The range of the char type is 0 to 2^16 - 1.
sunny
- Apr 22nd, 2012
In java char define with 2 byte not 1 byte i. e. 0 to 65536
Sandhya.Kishan
- Apr 14th, 2012
The char data type ranges from 128 to 127 and it requires 1 byte to store a particular character.
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What is the relationship between the Canvas class and the Graphics class
A Canvas object provides access to a Graphics object via its paint() method.
Sandhya.Kishan
- Apr 23rd, 2012
The graphics class object can be accessed by the paint() method which is provided by the canvas class object.
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What is the % operator
It is referred to as the modulo or remainder operator. It returns the remainder of dividingthe first operandby the second operand.
Sandhya.Kishan
- Apr 23rd, 2012
It is a reminder operator.
if r = x % y, then a non-negative q exist, such that
x = q*y + r.
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What are wrapped classes
Wrapped classes are classes that allow primitive types to be accessed as objects.
Sandhya.Kishan
- Apr 24th, 2012
Wrapped class is a private class defined with other class.The values once assigned in this class cannot be changed.It converts value of one data typr to other data type.
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What is the immediate superclass of the Applet class
Panel
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Can a for statement loop indefinitely
Yes, a for statement can loop indefinitely. For example, consider the following:for(;;) ;
Sandhya.Kishan
- Apr 24th, 2012
For(i=0::)
{
}
Tis is an example where the for loop runs indefinitely. -
What is the GregorianCalendar class
The GregorianCalendar provides support for traditional Western calendars.
Sandhya.Kishan
- Apr 24th, 2012
The GregorianCalendar class is a standard calendar which is supported by java.It contains constructors like GregorianCalendar() representing the moment it was created, the GregorianCalendar(int year, ...
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Which containers may have a MenuBar
Frame
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What is clipping
Clipping is the process of confining paint operations to a limited area or shape.
Sandhya.Kishan
- Apr 24th, 2012
Confining the areas of paint to a limited shape and size is known as clipping.
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Which containers use a border Layout as their default layout
The window, Frame and Dialog classes use a border layout as their default layout.
Sandhya.Kishan
- Apr 24th, 2012
The border layout is used as default layout in Window, Frame and Dialog class containers.
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Why do threads block on I/O
Threads block on i/o (that is enters the waiting state) so that other threads may executewhile the i/oOperation is performed.
Sandhya.Kishan
- Apr 24th, 2012
While performing the i/o operation a thread is blocked and there by it allows the next thread in the queue to complete its execution.
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Name three Component subclasses that support painting
The Canvas, Frame, Panel, and Applet classes support painting.
Sandhya.Kishan
- Apr 28th, 2012
Canvas class, frame class and applet class are the subclasses that support painting.
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What is the immediate superclass of the Dialog class
Window
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What interface must an object implement before it can be written to astream as an object
An object must implement the Serializable or Externalizable interface before it can bewritten to a stream as an object.
Sandhya.Kishan
- May 3rd, 2012
An object must implement the Serializable or Externalizable interface before it can be written to a stream as an object.
As it is a mechanism with which we can save the state of an object by converting it to a byte stream. -
To what value is a variable of the boolean type automatically initialized
The default value of the boolean type is false.
Sandhya.Kishan
- May 3rd, 2012
Boolean type variable is always automatically initialized to false value.
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Which java.util classes and interfaces support event handling
The EventObject class and the EventListener interface support event processing.
Nandhitha S
- May 3rd, 2012
Import java.awt.event.*;
Sandhya.Kishan
- Apr 28th, 2012
EventObject class and the EventListener interface support event handling in Java.Util class.
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When is an object subject to garbage collection
An object is subject to garbage collection when it becomes unreachable to the program inwhich it is used.
Sandhya.Kishan
- May 3rd, 2012
When an object becomes unreachable to any of the code then that object becomes eligible for garbage collection.
Once an object is garbage collected, It can no longer become reachable again. -
What is a layout manager
A layout manager is an object that is used to organize components in a container.
Sandhya.Kishan
- May 3rd, 2012
The arrangement of the components in the container is determined by the layout manager.
Example:When we add a component to an applet or a container, the container uses its layout manager to decide where to put the component. -
What is a compilation unit
A compilation unit is a Java source code file.
Sandhya.Kishan
- May 3rd, 2012
The source code for a Java class is called a compilation unit. Normally a compilation unit contains a single class definition and it is named for that class.
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What interface is extended by AWT event listeners
All AWT event listeners extend the java.util.EventListener interface.
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