Java Advanced Java - Technical Questions and Answers

71.	Can a Byte object be cast to a double value?
	Answer: No. An object cannot be cast to a primitive value. Workspace Report errors ... Name : Email: View Answer

72.	What is the difference between a static and a non-static inner class?
	Answer: A non-static inner class may have object instances that are associated with instances of the class's outer class. A static inner class does not have any object instances. Workspace Report errors ... Name : Email: View Answer

73.	What is the difference between the String and StringBuffer classes?
	Answer: String objects are constants. StringBuffer objects are not constants. Workspace Report errors ... Name : Email: View Answer

74.	If a variable is declared as private, where may the variable be accessed?
	Answer: A private variable may only be accessed within the class in which it is declared. Workspace Report errors ... Name : Email: View Answer

75.	What is an object's lock and which object's have locks?
	Answer: An object's lock is a mechanism that is used by multiple threads to obtain synchronized access to the object. A thread may execute a synchronized method of an object only after it has acquired the object's lock. All objects and classes have locks. A class's lock is acquired on the class's Class object. Workspace Report errors ... Name : Email: View Answer

76.	What is the Dictionary class?
	Answer: The Dictionary class provides the capability to store key-value pairs. Workspace Report errors ... Name : Email: View Answer

77.	How are the elements of a BorderLayout organized?
	Answer: The elements of a BorderLayout are organized at the borders (North, South, East, and West) and the center of a container. Workspace Report errors ... Name : Email: View Answer

78.	What is the % operator?
	Answer: It is referred to as the modulo or remainder operator. It returns the remainder of dividing the first operand by the second operand. Workspace Report errors ... Name : Email: View Answer

79.	When can an object reference be cast to an interface reference?
	Answer: An object reference be cast to an interface reference when the object implements the referenced interface. Workspace Report errors ... Name : Email: View Answer

80.	What is the difference between a Window and a Frame?
	Answer: The Frame class extends Window to define a main application window that can have a menu bar. Workspace Report errors ... Name : Email: View Answer