Java Advanced Java - Technical Questions and Answers

111.	What is the Collection interface?
	Answer: The Collection interface provides support for the implementation of a mathematical bag - an unordered collection of objects that may contain duplicates. Workspace Report errors ... Name : Email: View Answer

112.	What modifiers can be used with a local inner class?
	Answer: A local inner class may be final or abstract. Workspace Report errors ... Name : Email: View Answer

113.	What is the difference between static and non-static variables?
	Answer: A static variable is associated with the class as a whole rather than with specific instances of a class. Non-static variables take on unique values with each object instance. Workspace Report errors ... Name : Email: View Answer

114.	What is the difference between the paint() and repaint() methods?
	Answer: The paint() method supports painting via a Graphics object. The repaint() method is used to cause paint() to be invoked by the AWT painting thread. Workspace Report errors ... Name : Email: View Answer

115.	What is the purpose of the File class?
	Answer: The File class is used to create objects that provide access to the files and directories of a local file system. Workspace Report errors ... Name : Email: View Answer

116.	Can an exception be rethrown?
	Answer: Yes, an exception can be rethrown. Workspace Report errors ... Name : Email: View Answer

117.	Which Math method is used to calculate the absolute value of a number?
	Answer: The abs() method is used to calculate absolute values. Workspace Report errors ... Name : Email: View Answer

118.	How does multithreading take place on a computer with a single CPU?
	Answer: The operating system's task scheduler allocates execution time to multiple tasks. By quickly switching between executing tasks, it creates the impression that tasks execute sequentially. Workspace Report errors ... Name : Email: View Answer

119.	When does the compiler supply a default constructor for a class?
	Answer: The compiler supplies a default constructor for a class if no other constructors are provided. Workspace Report errors ... Name : Email: View Answer

120.	When is the finally clause of a try-catch-finally statement executed?
	Answer: The finally clause of the try-catch-finally statement is always executed unless the thread of execution terminates or an exception occurs within the execution of the finally clause. Workspace Report errors ... Name : Email: View Answer