Interpreter design pattern is used to evaluate sentences in a

language. E.g. In SQL we can use it to evaluate a query by

evaluating each keyword like SELECT, FROM, WHERE clause.

In an Interpreter implementation there is a class for each

keyword/symbol. A sentence is just a composite of these keywords.

But the sentence is represented by Syntax tree that can be

interpreted.

In JDK there are many places where Interpreter design pattern is

used. Some of these are as follows:

java.util.Pattern

java.text.Normalizer

Subclasses of java.text.Format: DateFormat,

MessageFormat, NumberFormat

Subclasses of javax.el.ELResolver: ArrayELResolver,

MapELResolver, CompositeELResolver etc.

https://www.baeldung.com/java-interpreter-pattern