String Templates - Syntactic sugar or useful improvement?
summary
Java 21 adds string templates as a preview feature with an explicit SDR processor that calls toString and a built‑in fmt processor that uses printf-style formats; IntelliJ shows migration hints. Custom processors are possible — demos extract Optional values and one processor returns a List instead of a String. The presenter shows a working live-coding demo and a clear anti-pattern where a processor mutates and clears a passed List, proving processors can do harmful side effects.
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chapters (7)
- 0:00Introduction to Java strings
- 2:16Legacy string concatenation
- 4:35String templates overview
- 6:00Working with template syntax
- 9:20IDE integration and hints
- 10:52Standard template processors
- 12:17Custom processors and patterns
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