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What is the Dictionary class
The Dictionary class provides the capability to store key-value pairs.
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How are the elements of a BorderLayout organized
The elements of a BorderLayout are organized at the borders (North, South, East, andWest) and the centerof a container.
Sandhya.Kishan
- Jun 2nd, 2012
The elements of a borderlayout are organized in the center and at the borders of the container.
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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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When can an object reference be cast to an interface reference
An object reference be cast to an interface reference when the object implements thereferenced interface.
Sandhya.Kishan
- Jul 25th, 2012
When an object implements the referenced interface then the object reference be cast to an interface reference.
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What is the difference between a Window and a Frame
The Frame class extends Window to define a main application window that can have amenu bar.
Sandhya.Kishan
- Jul 26th, 2012
A window is a Container and has BorderLayout by default.
A frame is a movable window with title bar and close button,usually it contains Panels. Its derived from a window.
Frame can be part of the window but window can not part of frame. -
Which class is extended by all other classes
The Object class is extended by all other classes.
Sandhya.Kishan
- Jun 2nd, 2012
The object class is the super class of each and every class and henae it is extended by all other classes.
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Can an object be garbage collected while it is still reachable
A reachable object cannot be garbage collected. Only unreachable objects may begarbage collected..
Sandhya.Kishan
- Jun 14th, 2012
No, reachable object cannot be garbage collection ,only when the object becomes unreachable in gets collected in garbage collector.
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What is the difference between the Font and FontMetrics classes
The FontMetrics class is used to define implementation-specific properties, such asascent and descent, of aFont object.
Sandhya.Kishan
- Jul 24th, 2012
The Font class maps the characters of the language to their respective glyphs.
The FontMetrics provides access to attributes of Fontobjects, things such as char width, char height, which help in drawing the fonts on the screen. -
How is rounding performed under integer division
The fractional part of the result is truncated. This is known as rounding toward zero.
Sandhya.Kishan
- Jul 25th, 2012
By truncating the fractional part of the result we are rounding the result and this is called as rounding towards zero.
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What happens when a thread cannot acquire a lock on an object
If a thread attempts to execute a synchronized method or synchronized statement and isunable to acquirean object's lock, it enters the waiting state until the lock becomes available.
Sandhya.Kishan
- Jul 26th, 2012
When a thread cannot acquire a lock on an object thread enters the waiting state until the lock becomes available .
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What classes of exceptions may be caught by a catch clause
A catch clause can catch any exception that may be assigned to the Throwable type. Thisincludes the Errorand Exception types.
Sandhya.Kishan
- Jul 21st, 2012
An exception which may be assigned to the Throwable type including the Error and Exception types are caught by catch clause.
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What is the SimpleTimeZone class
The SimpleTimeZone class provides support for a Gregorian calendar.
Sandhya.Kishan
- May 17th, 2012
The concrete subclass of TimeZone that represents a time zone which is use support the Gregorian calendar is called as a simple time zone class.Historical changes are not handled by this class.
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What is the Map interface
The Map interface replaces the JDK 1.1 Dictionary class and is used associate keys withvalues.
Sandhya.Kishan
- May 17th, 2012
Map interface represents a mapping between a key and a value without duplicate keys.The maps contents are viewed as a set of keys, collection of values, or set of key-value mappings. Map permits null ...
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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 orcontinue statement.
Sandhya.Kishan
- Jul 21st, 2012
For statements which are enclosed by a break or a continue statement makes sense to use a label statement.
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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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