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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 24th, 2012
When an object becomes unreachable to the program in which it is being used then an object subjects to the garbage collection.
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If an object is garbage collected, can it become reachable again
Once an object is garbage collected, it ceases to exist. It can no longer become reachableagain.
Sandhya.Kishan
- May 22nd, 2012
An object reaches the garbage collection once it becomes unreachable and it cannot become reachable again.
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Use of abstract class and interface
What is the exact use of abstract class and interface?
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Are true and false keywords
The values true and false are not keywords.
Sandhya.Kishan
- May 22nd, 2012
No true and false are not keywords but they can only be the return types of a boolean data type.
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What Checkbox method allows you to tell if a Checkbox is checked
getState()
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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 arithmetic operations can result in the throwing of anArithmeticException
Integer / and % can result in the throwing of an ArithmeticException.
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What interface is extended by AWT event listeners
All AWT event listeners extend the java.util.EventListener interface.
Sandhya.Kishan
- May 22nd, 2012
Java.util.EventListener interface is extented by all AWT event listeners.
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What is the List interface
The List interface provides support for ordered collections of objects.
Sandhya.Kishan
- May 22nd, 2012
List interface extends collection interface.List interface is used for positional access,search,iteration and for range view operations.
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What are the disadvantages of using threads?
DeadLock.
Sandhya.Kishan
- May 22nd, 2012
The disadvantage of thread is that in may result in the starvation because of race conditions and deadlocks.
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Does Java have destructors?
No garbage collector does the job working in the background
Sandhya.Kishan
- May 22nd, 2012
Java does not support destructors, since java supports the concept of garbage collection,hence the garbage collector is used to automatically free the space which has occupied by the program while run...
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How can a dead thread be restarted
A dead thread cannot be restarted.
Sandhya.Kishan
- May 19th, 2012
A thread once dead cannot be restarted. The thread is said to be dead only after it completes its execution with the expected results hence dead thread cannot be restarted.
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What is a layout manager
A layout manager is an object that is used to organize components in a container.
Sandhya.Kishan
- May 19th, 2012
Layout managers are software components which have the ability to lay out widgets by their relative positions without using distance units.It is an object that implements the LayoutManager interface* and determines the size and position of the components within a container.
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What modifiers may be used with a top-level class
A top-level class may be public, abstract, or final.
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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
- May 19th, 2012
Statements that are of a sequence are organized as a single statement group with the help of statement block.
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To what value is a variable of the boolean type automatically initialized
The default value of the boolean type is false.
Sandhya.Kishan
- May 19th, 2012
A Boolean type is automatically initialized to value 0 or false value.
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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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Is &&= a valid Java operator
No, it is not.
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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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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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