Advanced Java - Java Programming Interview Questions and Answers | LucentBlackBoard

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71.	What is the difference between the String and StringBuffer classes?
	String objects are constants. StringBuffer objects are not constants.

72.	If a variable is declared as private, where may the variable be accessed?
	A private variable may only be accessed within the class in which it is declared.

73.	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.

74.	What is the Dictionary class?
	The Dictionary class provides the capability to store key-value pairs.

75.	How are the elements of a BorderLayout organized?
	The elements of a BorderLayout are organized at the borders (North, South, East, and West) and the center of a container.

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