JAVA DESIGN PATTERN QUESTIONS WITH ANSWERS
Question: Describe the visitor design pattern
Answer: Represents an operation to be performed on the elements of an object
structure. Visitor lets you define a new operation without changing the classes of the elements on which it operates. The root of a class hierarchy defines an abstract method to accept a visitor. Subclasses implement this method with visitor.visit(this). The Visitor interface has visit methods for all subclasses of the baseclass in the hierarchy.
Question: What is a design pattern?
Answer: A design pattern systematically names, motivates, and explains a general design that addresses a recurring design problem.
Question: Describe the visitor design pattern
Answer: Represents an operation to be performed on the elements of an object structure. Visitor lets you define a new operation without changing the classes of the elements on which it operates.
The root of a class hierarchy defines an abstract method to accept a visitor. Subclasses implement this method with visitor.visit(this). The Visitor interface has visit methods for all subclasses of the baseclass in the hierarchy.
