Java Advanced Java - Technical Questions and Answers

121.	Which class is the immediate superclass of the Container class?
	Answer: Component. Workspace Report errors ... Name : Email: View Answer

122.	If a method is declared as protected, where may the method be accessed?
	Answer: A protected method may only be accessed by classes or interfaces of the same package or by subclasses of the class in which it is declared. Workspace Report errors ... Name : Email: View Answer

123.	How can the Checkbox class be used to create a radio button?
	Answer: By associating Checkbox objects with a CheckboxGroup. Workspace Report errors ... Name : Email: View Answer

124.	Which non-Unicode letter characters may be used as the first character of an identifier?
	Answer: The non-Unicode letter characters $ and _ may appear as the first character of an identifier Workspace Report errors ... Name : Email: View Answer

125.	What restrictions are placed on method overloading?
	Answer: Two methods may not have the same name and argument list but different return types. Workspace Report errors ... Name : Email: View Answer

126.	What happens when you invoke a thread's interrupt method while it is sleeping or waiting?
	Answer: When a task's interrupt() method is executed, the task enters the ready state. The next time the task enters the running state, an InterruptedException is thrown. Workspace Report errors ... Name : Email: View Answer

127.

What is casting?

128.	What is the return type of a program's main() method?
	Answer: A program's main() method has a void return type. Workspace Report errors ... Name : Email: View Answer

129.	Name four Container classes.
	Answer: Window, Frame, Dialog, FileDialog, Panel, Applet, or ScrollPane. Workspace Report errors ... Name : Email: View Answer

130.	What is the difference between a Choice and a List?
	Answer: A Choice is displayed in a compact form that requires you to pull it down to see the list of available choices. Only one item may be selected from a Choice. A List may be displayed in such a way that several List items are visible. A List supports the selection of one or more List items. Workspace Report errors ... Name : Email: View Answer