[bad_user]

Java relies on String + Object for composing strings, thus unsafely converting any object into string. An implicit conversion, akin to what JavaScript is doing.

String interpolation would be safer, as it would make the intent clearer, and you wouldn't risk bumping in corner cases. It would be even safer if the protocol could be overrided such that you wouldn't have to use Object#toString, but for Java that's too much already.

Java has been a very conservative language. And I understand why.

But it's funny how, for many features that were added later, people were rationalizing their absence with such lines too. E.g. we don't need anonymous functions / lambdas, as anonymous classes are enough. Well, turned out that Microsoft was right all along when they released those in J#.

Also adding a template engine is overkill for doing string concatenation.

[zelly]

> But it's funny how, for many features that were added later, people were rationalizing their absence with such lines too

There's nothing wrong with that. If string interpolation is really useful, then Java will add it some years down the line.

It's cheap to add features but literally impossible to remove them. There's no way to undo a mistake in language design. That's an asymmetry. I'd rather err on the side of caution than kitchen-sinking it.

[bad_user]

Oh, I don't know about that. I wouldn't call it impossible.

I like how Java binaries still work on the latest Java, however, if distribution happens via binaries, why should the language keep source compatibility anyway?

Or, you know, the latest compiler could allow you to select the source code version you want. And automated code migration tools can work too.

---

Err'ing on the side of not getting features is why Java has lost a lot of mindshare.

Java is still super popular, but that's basically in spite of the language itself, because the language is awful.

[fomine3]

> If string interpolation is really useful, then Java will add it some years down the line.

Now is the year. String interpolation is really harmless feature.

[60secz]

It deeply pains me that String is only a concrete type and that Object.toString() does not implement an interface.

[pjmlp]

J++, J# was as transition into .NET.

[bad_user]

Indeed, you're correct.