Java Advanced Java - Technical Questions and Answers

61.	What method is invoked to cause an object to begin executing as a separate thread?
	Answer: The start() method of the Thread class is invoked to cause an object to begin executing as a separate thread. Workspace Report errors ... Name : Email: View Answer

62.	Name two subclasses of the TextComponent class.
	Answer: TextField and TextArea. Workspace Report errors ... Name : Email: View Answer

63.	Which containers may have a MenuBar?
	Answer: Frame. Workspace Report errors ... Name : Email: View Answer

64.	How are commas used in the intialization and iteration parts of a for statement?
	Answer: Commas are used to separate multiple statements within the initialization and iteration parts of a for statement. Workspace Report errors ... Name : Email: View Answer

65.	What is the purpose of the wait(), notify(), and notifyAll() methods?
	Answer: The wait(), notify(), and notifyAll() methods are used to provide an efficient way for threads to wait for a shared resource. When a thread executes an object's wait() method, it enters the waiting state. It only enters the ready state after another thread invokes the object's notify() or notifyAll() methods.. Workspace Report errors ... Name : Email: View Answer

66.	What is an abstract method?
	Answer: An abstract method is a method whose implementation is deferred to a subclass. Workspace Report errors ... Name : Email: View Answer

67.

How are Java source code files named?

68.	What is the relationship between the Canvas class and the Graphics class?
	Answer: A Canvas object provides access to a Graphics object via its paint() method. Workspace Report errors ... Name : Email: View Answer

69.	What are the high-level thread states?
	Answer: The high-level thread states are ready, running, waiting, and dead. Workspace Report errors ... Name : Email: View Answer

70.	What value does read() return when it has reached the end of a file?
	Answer: The read() method returns -1 when it has reached the end of a file. Workspace Report errors ... Name : Email: View Answer