JEP 430: StringTemplates

Author: ibrahimatay

README.md

@@ -5,6 +5,9 @@ This repository contains Java examples that are designed to track and document t
 
 ## Specifications & Practices
 
+* [Java 21](java-21) (September, 2023)
+  * [JEP 430](https://openjdk.org/jeps/430): String Templates
+
 * [Java 16](java-16/) (March, 2021)
   * [JEP 395](https://openjdk.java.net/jeps/395): Records
 

java-21/pom.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>com.ibrahimatay</groupId>
+        <artifactId>Java-Features</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>java-21</artifactId>
+
+    <properties>
+        <maven.compiler.source>18</maven.compiler.source>
+        <maven.compiler.target>18</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>21</source>
+                    <target>21</target>
+                    <compilerArgs>--enable-preview</compilerArgs>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

java-21/src/main/java/com/ibrahimatay/JEP430StringTemplates.java

@@ -0,0 +1,71 @@
+package com.ibrahimatay;
+
+
+import static java.lang.StringTemplate.RAW;
+import static java.lang.StringTemplate.STR;
+import static java.util.FormatProcessor.FMT;
+
+/*
+* JEP 430: String Templates (Preview)
+* https://openjdk.org/jeps/430
+* */
+public class JEP430StringTemplates {
+
+    public static void main(String[] args) {
+        System.out.println(interpolationUsingSTRProcessor(getFeelsLike(), getTemperature(), getUnit()));
+        System.out.println(interpolationOfJSONBlock(getFeelsLike(), getTemperature(), getUnit()));
+        System.out.println(interpolationWithExpressions());
+        System.out.println(interpolationWithTemplates());
+        System.out.println(interpolationOfJSONBlockWithFMT(getFeelsLike(), 25, getUnit()));
+    }
+
+    static String interpolationUsingSTRProcessor(String feelsLike, String temperature, String unit) {
+        return STR
+                . "Today's weather is \{ feelsLike }, with a temperature of \{ temperature } degrees \{ unit }" ;
+    }
+
+    static String interpolationOfJSONBlock(String feelsLike, String temperature, String unit) {
+        return STR
+                . """
+          {
+            "feelsLike": "\{ feelsLike }",
+            "temperature": "\{ temperature }",
+            "unit": "\{ unit }"
+          }
+          """ ;
+    }
+
+    static String interpolationWithExpressions() {
+        return STR
+                . "Today's weather is \{ getFeelsLike() }, with a temperature of \{ getTemperature() } degrees \{ getUnit() }" ;
+    }
+
+    static String interpolationWithTemplates() {
+        StringTemplate str = RAW
+                . "Today's weather is \{ getFeelsLike() }, with a temperature of \{ getTemperature() } degrees \{ getUnit() }" ;
+        return STR.process(str);
+    }
+
+    static String interpolationOfJSONBlockWithFMT(String feelsLike, float temperature, String unit) {
+        return FMT
+                . """
+      {
+        "feelsLike": "%1s\{ feelsLike }",
+        "temperature": "%2.2f\{ temperature }",
+        "unit": "%1s\{ unit }"
+      }
+      """ ;
+    }
+
+    private static String getFeelsLike() {
+        return "pleasant";
+    }
+
+    private static String getTemperature() {
+        return "25";
+    }
+
+    private static String getUnit() {
+        return "Celsius";
+    }
+}

pom.xml

@@ -17,6 +17,7 @@
         <module>java-7</module>
         <module>java-6</module>
         <module>java-16</module>
+        <module>java-21</module>
     </modules>
 
     <properties>