Java Advanced Java - Technical Questions and Answers

141.	What are the legal operands of the instanceof operator?
	Answer: The left operand is an object reference or null value and the right operand is a class, interface, or array type. Workspace Report errors ... Name : Email: View Answer

142.	How are the elements of a GridBagLayout organized?
	Answer: The elements of a GridBagLayout are of equal size and are laid out using the squares of a grid. Workspace Report errors ... Name : Email: View Answer

143.	What an I/O filter?
	Answer: An I/O filter is an object that reads from one stream and writes to another, usually altering the data in some way as it is passed from one stream to another. Workspace Report errors ... Name : Email: View Answer

144.	If an object is garbage collected, can it become reachable again?
	Answer: Once an object is garbage collected, it ceases to exist. It can no longer become reachable again. Workspace Report errors ... Name : Email: View Answer

145.	What is the Set interface?
	Answer: The Set interface provides methods for accessing the elements of a finite mathematical set. Sets do not allow duplicate elements. Workspace Report errors ... Name : Email: View Answer

146.	What classes of exceptions may be thrown by a throw statement?
	Answer: A throw statement may throw any expression that may be assigned to the Throwable type. Workspace Report errors ... Name : Email: View Answer

147.	What are E and PI?
	Answer: E is the base of the natural logarithm and PI is mathematical value pi. Workspace Report errors ... Name : Email: View Answer

148.	Are true and false keywords?
	Answer: The values true and false are not keywords. Workspace Report errors ... Name : Email: View Answer

149.	What is a void return type?
	Answer: A void return type indicates that a method does not return a value. Workspace Report errors ... Name : Email: View Answer

150.	What is the purpose of the enableEvents() method?
	Answer: The enableEvents() method is used to enable an event for a particular object. Normally, an event is enabled when a listener is added to an object for a particular event. The enableEvents() method is used by objects that handle events by overriding their event-dispatch methods. Workspace Report errors ... Name : Email: View Answer