Core - Java Programming Interview Questions and Answers | LucentBlackBoard

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61.	What value does read() return when it has reached the end of a file?
	The read() method returns -1 when it has reached the end of a file.

62.	Can a Byte object be cast to a double value?
	No, an object cannot be cast to a primitive value.

63.	What is the difference between a static and a non-static inner class?
	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.

64.	What is an object's lock and which object's have locks?
	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.

65.	What is the % operator?
	It is referred to as the modulo or remainder operator. It returns the remainder of dividing the first operand by the second operand.

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