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What is a layered pane?
Sandhya.Kishan
- May 16th, 2012
LayeredPane is a container which allows switching between different sets of displayed components. Each set of components, called a page, is declared within the LayeredPane component and its possible t...
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What is web.xml?
Sandhya.Kishan
- May 16th, 2012
The web.xml defines each servlet and JSP page within a Web Application. It enumerates enterprise beans referenced in the Web application. It also provides configuration and deployment information fo...
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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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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. -
Is java dynamic typed language?
Sandhya.Kishan
- May 16th, 2012
Yes, java is dynamic typed language as it has a property of a language where type checks are performed mostly at run time.A program is dynamically typed if it uses at least one dynamically typed variable.
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What is context?
Sandhya.Kishan
- May 16th, 2012
Context is the virtual environment required to suspend a running software program.The concept of context assumes significance in the case of interruptible tasks, wherein upon being interrupted the processor saves the context and proceeds to serve the Interrupt service routine
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What is SAX?
Sandhya.Kishan
- May 16th, 2012
SAX defines an abstract programmatic interface that models the XML information set (infoset) through a linear sequence of familiar method calls.They are used to develop standard for the events-based parsing of XML documents.
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What modifiers may be used with an inner class that is a member of an outerclass
A (non-local) inner class may be declared as public, protected, private, static, final, orabstract.
Sandhya.Kishan
- May 11th, 2012
Expect static modifier all other modifiers such public,private,protected,default,abstract and final modifiers can be used with inner class which is a member of an outer-class.
If the inner class contains the static modifier it results in compilation error. -
What is the argument type of a program's main() method
A program's main() method takes an argument of the String[] type.
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Can a double value be cast to a byte
Yes, a double value can be cast to a byte.
Sandhya.Kishan
- May 11th, 2012
Any data type can be typecasted to any other data type and hence we can type cast a double value to a byte.
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Can an anonymous class be declared as implementing an interface andextending a class
An anonymous class may implement an interface or extend a superclass, but may not bedeclared to doboth.
Sandhya.Kishan
- May 11th, 2012
An anonymous class simultaneously cannot be declared as implementing an interface and extending a class but it may implement an interface or extend a superclass.
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What invokes a thread's run() method
After a thread is started, via its start() method or that of the Thread class, the JVMinvokes the thread'srun() method when the thread is initially executed.
Sandhya.Kishan
- May 11th, 2012
A thread starts its process by invoking the start() method, this start() method invokes the run() method.
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How does Java handle integer overflows and underflows
It uses those low order bytes of the result that can fit into the size of the type allowed bythe operation.
Sandhya.Kishan
- May 11th, 2012
Java do not handle integer overflow or underflow it just wraps round the value be adding 1 to the maximum values which returns the minimum value.
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What's new with the stop(), suspend() and resume() methods in JDK 1.2
The stop(), suspend() and resume() methods have been deprecated in JDK 1.2.
Sandhya.Kishan
- May 8th, 2012
The stop(), suspend() and resume() methods are marked as obsolete to warn against its use in the future so that it may be phased out.
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Under what conditions is an object's finalize() method invoked by the garbagecollector
The garbage collector invokes an object's finalize() method when it detects that the objecthas become unreachable.
Sandhya.Kishan
- May 7th, 2012
When an object becomes unreachable by any of the methods in a program then the finalize() method in invoked.
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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 7th, 2012
An object reaches the garbage collector as it becomes unreachable ,hence once an object is garbage collected it cannot be made reachable again.
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What is a void return type
A void return type indicates that a method does not return a value.
Sandhya.Kishan
- May 7th, 2012
Void return type specifies that the particular function will not return any value.
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What Checkbox method allows you to tell if a Checkbox is checked
getState()
Sandhya.Kishan
- May 7th, 2012
The method which is used to check whether the checkbox is checked or not is the getstate() method.
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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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