Java 21 JEP 430 String Templates

Very Glad News that Java 21 welcomes JEP 430: String Templates (Preview)

✅ This awesome feature gives developers
the power of object interpolation when
the objects are embedded or referred to within a given string literal

✅ Almost every use of string interpolation involves
structuring the string to fit some kind of template

✅ Template expressions are a new kind of expression in the Java programming language.

✅ Template expressions can perform string interpolation but are also programmable in a way that helps developers compose strings safely and efficiently.

✅ In addition, template expressions are not limited to composing strings — they can turn structured text into any kind of object, according to domain-specific rules.

Source: JEP Doc

?A simple example

String name = "Sunit Ghosh";
String programmingLanguage = "Java";
String info = STR."My name is \{name}. I love programming in \{programmingLanguage}.";

?What is STR?
STR is a template processor defined in the Java Platform.

It performs string interpolation by replacing each embedded expression in the template with the (stringified) value of that expression.

STR is a public static final field that is automatically imported into every Java source file.

?See Grammer

?Behind The Scenes

The expression to the left of the dot is evaluated to obtain an instance of the nested StringTemplate.Processor, that is, a template processor and a Functional Interface

? See public interface StringTemplate

The expression to the right of the dot is evaluated to obtain an instance of StringTemplate

Sunit Ghosh

#Java #Java21 #JDK21 #Java21StringTemplates