Java 21 String Templates (Preview) | STR, FMT & Real-World Examples
Java 21 introduced String Templates as a preview feature for building dynamic text using embedded expressions and template processors.
In this lesson, we begin with the problems developers face when using string concatenation, String.format(), and StringBuilder. We then explore Java 21 String Templates using the STR and FMT processors, followed by practical examples in IntelliJ IDEA.
Important current-status note: String Templates were previewed in Java 21 and Java 22 but were later withdrawn before Java 23 for redesign. This lesson explains the Java 21 preview design and the ideas behind template processors. The STR and FMT syntax shown here is not available in current JDK releases.
In this video, you will learn:
✅ Problems with string concatenation, String.format(), and StringBuilder
✅ What Java 21 String Templates are
✅ Template processors, template literals, and embedded expressions
✅ How to use variables, methods, arithmetic, conditions, and streams
✅ Single-line and multiline String Templates
✅ How the STR processor works
✅ How formatting works with the FMT processor
✅ STR vs FMT and when to use each one
✅ Building a personalised shipping notification
✅ Creating a formatted order confirmation email
✅ Generating SMS alerts with FMT
✅ Best practices for null handling and complex expressions
This lesson is part of my complete Java 21 course:
Java 21 Features Deep Dive: Virtual Threads & Spring Boot
https://www.udemy.com/course/java-21-...
Source Code Repository:
https://github.com/j2eeexpert2015/jav...
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CHAPTERS
00:00 Introduction
01:19 Problems with string concatenation
02:47 Using String.format()
05:17 Using StringBuilder
06:36 Hands-on: the silent String.format() bug
09:30 What are Java 21 String Templates?
10:35 Template processor, literal and embedded expression
11:50 Expressions inside String Templates
13:10 How String Templates work
14:00 Single-line and multiline templates
14:50 Shipping notification example
17:37 Hands-on: building the shipping notification
20:15 The FMT processor
21:30 STR vs FMT
22:30 Real-world use cases
23:00 Order confirmation email
25:45 Hands-on: order confirmation template
29:30 SMS alerts using FMT
32:15 Hands-on: formatted SMS alert
33:45 String Template best practices
36:30 Conclusion and learning resources
#Java21 #StringTemplates #JavaTutorial
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