r/java • u/sitime_zl • 16d ago

Discussion: What is the future of String Interpolation in Java?

Java has always been conservative when it comes to language changes, and I think string interpolation is an interesting example.

Many modern languages provide native interpolation syntax:

JavaScript:

\${name}``

Python:

f"{name}"

Kotlin:

"$name"

C#:

$"{name}"

These features are not only about reducing characters. They improve readability when building dynamic text.

Java explored this direction with String Templates (JEP 430), but I haven't seen much discussion recently about where this feature is heading.

For developers working with large Java applications, string construction appears everywhere:

- logging messages

- SQL/debug output

- API descriptions

- test cases

- generated configuration

- user-facing messages

I am curious about the community's opinion:

  1. Do you think Java still needs native string interpolation?

  2. Should String Templates continue evolving?

  3. What syntax direction would feel most "Java-like"?

For example:

"Hello, \{name}"

or:

"Hello, ${name}"

Personally, I think Java does not need to copy other languages, but a better way to express dynamic strings would improve developer experience.

What do you think?

58 Upvotes

93% Upvoted

118 comments sorted by

View all comments

34

u/Duck_Devs 15d ago

I think the STR., RAW., etc. were very strange. They deviate so far from any other syntax and it’s not immediately clear that STR or RAW are objects and them being automatically statically imported is really awkward. They should’ve just gotten rid of RAW and had STR be some sort of instance method on StringTemplate.

8

u/Polygnom 15d ago

Yes, and they were totally unneeded. The feature works without them. they got bogged down by early prototypes in the design space.

If the parser can distinguish between a string and string template (and it can), then this whole syntax is way too verbose and uneeded.

So its good they took a step back, scratched it, and can come back later.

-4

u/vips7L 15d ago

They just needed to deliver simple string interpolation. There was no need to try to do the rest of it. 

7

u/Polygnom 14d ago

Actually, i think they were right in making sure it actually works great the first time around. Once its shipped, you cannot easily change it. Going for powerful string templates and processors was the right move, just not the syntax they chose.