Interpreter Design Pattern Tutorial with Java Code Example for Beginners

Interpreter design pattern is one of the behavioral design patterns. Interpreter pattern is used to defines a grammatical representation for a language and provides an interpreter to deal with this grammar. The interpreter pattern specifies how to evaluate sentences in a language. This pattern involves implementing an expression interface which tells to interpret a particular context. This pattern is used in SQL parsing, symbol processing engine etc.

An Interpreter Pattern says that "to define a representation of grammar of a given language, along with an interpreter that uses this representation to interpret sentences in the language". Grammars are mapped to classes to arrive to a solution.
For example, 7 – 2 can be mapped to “ClsMinus” class.

The two different components of interpreter pattern are context & logic. Context contains the data and the logic part contains the logic which will convert the context to readable format.

** Interpreter Design Pattern Date Format Example **
we have broken the date format in to four components Month, Day, Year and the separator. For all these four components we will define separate classes which will contain the logic. There are two types of classes one is the expression (logical) classes which contain logic and the other is the context class which contain data. We have defined all the expression parsing in different classes, all these classes inherit from common interface “ClsAbstractExpression” with a method “evaluate”.

The “evaluate” method takes a context class which has the data; this method parses data according to the expression logic.For instance “ClsYearExpression” replaces the “YYYY” with the year value, “ClsMonthExpression” replaces the “MM” with month and so on.

** Where to use Interpreter Design Pattern **
1. Whenever we want to evaluate data for different expressions.
2. Whenever we want to create parser to parse statements to take inputs.
3. Whenever we want to develop an interpreter for a new sign language to process provided input.

** Advantages of Interpreter Design Pattern **
1. It's easy to change and extend the grammar.
2. Implementing the grammar is easy, too.
3. Adding new ways to interpret expressions.

** Chapter Timestamps **
0:00 Welcome to Interpreter Design Pattern
0:26 Recap of Memento design pattern
1:28 Introduction of Interpreter design pattern
3:06 Example of Interpreter design pattern
4:12 Java coding implementation of interpreter design pattern
9:34 Usage of Interpreter Design Pattern
10:10 Advantages of Interpreter Design Pattern
10:23 Summary
11:03 Next Video on Iterator Design Pattern

#interpreterpattern #interpreterdesignpattern #designpatterns

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Previous Video (Memento Design Patterns): https://youtu.be/Xc1XLWaFTEg

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** Acronyms **
OOP – Object Oriented Programming Languages
GOF – Gang of Four Design Pattern
COD – Code One Digest

** References ** https://www.tutorialspoint.com/design_pattern/design_pattern_overview.htm

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