Design Patterns: Interpreter, Chain of Responsibility, Command
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Questions and Answers

The Context class in the Interpreter Pattern example is used to hold the values of variables used in expressions.

True

The Expression interface defines the interpret method which returns a floating-point value.

False

The Number class represents a non-terminal expression in the Interpreter Pattern example.

False

The Add class takes three expressions (left, right, and operator) as parameters in its constructor.

<p>False</p> Signup and view all the answers

When the interpret method of the Add class is called, it evaluates the left and right expressions using the provided Context and interpretations.

<p>True</p> Signup and view all the answers

The Interpreter Pattern example is implemented in C++, not Java.

<p>False</p> Signup and view all the answers

The Interpreter Pattern is a structural design pattern.

<p>False</p> Signup and view all the answers

The Interpreter Pattern is used to define a grammar for interpreting sentences in a language, and provides a way to evaluate sentences in that language.

<p>True</p> Signup and view all the answers

The Terminal Expression component of the Interpreter Pattern implements an Interpret operation associated with non-terminal symbols in the grammar.

<p>False</p> Signup and view all the answers

The Non Terminal Expression component of the Interpreter Pattern contains instances of the abstract expression representing the subexpressions for that non-terminal.

<p>True</p> Signup and view all the answers

The Context component of the Interpreter Pattern contains information that is specific to each node in the abstract syntax tree.

<p>False</p> Signup and view all the answers

One advantage of the Interpreter Pattern is that it simplifies adding new ways to interpret expressions, but a disadvantage is that it may lead to complex class hierarchies.

<p>True</p> Signup and view all the answers

The Iterator Pattern allows direct access to the underlying representation of an aggregate object.

<p>False</p> Signup and view all the answers

The ConcreteIterator keeps track of the next position in the traversal of the aggregate.

<p>True</p> Signup and view all the answers

ConcreteAggregate implements the Iterator interface in the Iterator Pattern.

<p>False</p> Signup and view all the answers

Iterator Pattern simplifies the iteration process by exposing all implementation details.

<p>False</p> Signup and view all the answers

One advantage of the Iterator Pattern is that it does not introduce any overhead in maintaining iterator objects.

<p>False</p> Signup and view all the answers

Iterator Pattern is suitable for use with lazy evaluation and streams.

<p>False</p> Signup and view all the answers

The Interpreter Pattern allows for the interpretation of complex arithmetic expressions involving nested parentheses and multiple operators.

<p>False</p> Signup and view all the answers

In the provided code, the Context class is responsible for storing the values of variables used in the expressions.

<p>True</p> Signup and view all the answers

The interpret method in the provided code is a part of the Number class and is responsible for evaluating the expression.

<p>False</p> Signup and view all the answers

The Iterator Pattern is used to traverse the elements of a collection without exposing its underlying implementation details.

<p>True</p> Signup and view all the answers

In the provided code, the Main class creates an instance of the Context class and sets the values of variables 'x' and 'y' to 10 and 5, respectively.

<p>True</p> Signup and view all the answers

The Interpreter Pattern is a structural design pattern, while the Iterator Pattern is a behavioral design pattern.

<p>True</p> Signup and view all the answers

The Iterator Pattern is used to access the elements of an aggregate object sequentially without exposing its underlying representation.

<p>True</p> Signup and view all the answers

The ConcreteAggregate class in the example is responsible for creating and managing the Concrete Iterator object.

<p>True</p> Signup and view all the answers

The Iterator interface in the example is a specific implementation for iterating over integers, and cannot be used for other data types.

<p>False</p> Signup and view all the answers

The ConcreteIterator class in the example keeps track of the current position in the array using a private variable called 'index'.

<p>False</p> Signup and view all the answers

The Client Code in the example creates a new instance of the ConcreteIterator class directly, rather than obtaining it from the ConcreteAggregate.

<p>False</p> Signup and view all the answers

The Iterator Pattern is a behavioral design pattern that provides a way to access the elements of an aggregate object sequentially without exposing its underlying representation.

<p>True</p> Signup and view all the answers

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