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Java 21 String Templates

Java 21 introduced preview of String Templates which allow using string interpolation like Javascript Template Literals.

Enable Preview​

To use String Templates, you need to enable the preview feature in gradle

tasks.withType(JavaCompile).configureEach {
    options.compilerArgs += "--enable-preview"
}

tasks.withType(Test).configureEach {
    jvmArgs += "--enable-preview"
}

tasks.withType(JavaExec).configureEach {
    jvmArgs += "--enable-preview"
}

STR​

  • Use \{varName} to interpolate variable
  • Both single line string " and text block """ are supported
import static java.lang.StringTemplate.STR;

class Main {
    public static void main(String[] args) {
        var name = "World";
        System.out.println(STR."Hello, \{name}!");
        System.out.println(STR."""
            Hello!
            This is a new \{name}!
        """);
    }
}

References​