Java 21 Programs

Author: lokeshgupta1981

pom.xml

@@ -203,15 +203,15 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.8.1</version>
+        <version>3.11.0</version>
         <configuration>
-          <source>17</source>
-          <target>17</target>
+          <source>21</source>
+          <target>21</target>
           <annotationProcessorPaths>
             <path>
               <groupId>org.projectlombok</groupId>
               <artifactId>lombok</artifactId>
-              <version>1.18.22</version>
+              <version>1.18.30</version>
             </path>
             <path>
               <groupId>io.soabase.record-builder</groupId>

src/main/java/com/howtodoinjava/core/string/StartsWith.java

@@ -1,6 +1,8 @@
 package com.howtodoinjava.core.string;
 
+import java.util.regex.Pattern;
 import org.apache.commons.lang3.ObjectUtils.Null;
+import org.apache.commons.lang3.StringUtils;
 import org.junit.jupiter.api.Assertions;
 
 public class StartsWith {
@@ -21,5 +23,33 @@ public static void main(String[] args) {
     Assertions.assertTrue(blogName.startsWith("h", 0));
     Assertions.assertFalse(blogName.startsWith("do", 0));
     Assertions.assertTrue(blogName.startsWith("do", 5));
+
+    String text = "The quick brown fox jumps over the lazy dog";
+
+    boolean result = StringUtils.startsWithAny(text,"The", "A", "An");
+    System.out.println(result);
+
+    //3
+    String[] prefixes = { "The", "A", "An" };
+    String regex = "^(?:" + String.join("|", prefixes) + ").*";
+
+    if (Pattern.compile(regex).matcher(text).matches()) {
+      System.out.println("The string starts with one of the specified values.");
+    } else {
+      System.out.println("The string does not start with any of the specified values.");
+    }
+
+    //4
+    for (String prefix : prefixes) {
+      if (text.startsWith(prefix)) {
+        System.out.println("The string starts with '" + prefix + "'.");
+        break; // Exit the loop when a match is found
+      }
+    }
+
+    result = StringUtils.startsWithIgnoreCase(text, "the");
+
+    System.out.println(result);   // true
+
   }
 }

src/main/java/com/howtodoinjava/newFeatures/java21/ScopedValueTest.java

@@ -29,11 +29,11 @@ public static void main(String[] args) {
   }
 
   static void doSomething() {
-    System.out.println("Scoped Value in doSomething(): " + CONTEXT.get());
+    System.out.println(STR."Scoped Value in doSomething(): \{CONTEXT.get()}");
   }
 
   static String doSomethingInChildThread() {
-    System.out.println("Scoped Value in insideChildThread(): " + CONTEXT.get());
+    System.out.println(STR."Scoped Value in insideChildThread(): \{CONTEXT.get()}");
     return CONTEXT.get();
   }
 

src/main/java/com/howtodoinjava/newFeatures/java21/StructuredConcurrency.java

@@ -47,8 +47,7 @@ public Response getClientById(Long id) {
 
       System.out.println("Response is received from all workers...");
       //The subtasks have completed by now so process the result
-      return new Response(accountDetailsFuture.get(),
-          linkedAccountsFuture.get(),
+      return new Response(accountDetailsFuture.get(), linkedAccountsFuture.get(),
           userDetailsFuture.get());
     } catch (InterruptedException e) {
       throw new RuntimeException(e);

src/main/java/com/howtodoinjava/newFeatures/java21/UnnamedPatterns.java

@@ -9,22 +9,24 @@ public static void main(String[] args) {
     Employee employee = new Employee(101L, "John Doe", LocalDate.of(1990, 5, 15), true, department);
 
     //With unused pattern variables
-    if (employee instanceof Employee(Long id, String name, LocalDate dateOfBirth, Boolean status,
-                                     Department(Long depId, String depName, Boolean depStatus))) {
+    if (employee instanceof Employee(
+        Long id, String name, LocalDate dateOfBirth, Boolean status,
+        Department(Long depId, String depName, Boolean depStatus)
+    )) {
 
       System.out.printf("Employee %d works in department %s.", id, depName);
     }
 
     if (department instanceof Department(_, String name, _)) {
-      System.out.println("Department Name is : " + name);  // Prints 'Department Name is : HR'
+      System.out.println(STR."Department Name is : \{name}");  // Prints 'Department Name is : HR'
     }
 
     if (employee instanceof Employee(Long id, _, _, _, Department(_, String depName, _))) {
       System.out.printf("Employee %d works in department %s.", id, depName);
     }
 
     if (employee instanceof Employee(Long id, _, _, _, _)) {
-      System.out.println("Employee Id is : " + id);  // Prints 'Employee Id is : 101'
+      System.out.println(STR."Employee Id is : \{id}");  // Prints 'Employee Id is : 101'
     }
   }
 }
@@ -33,6 +35,7 @@ record Department(Long id, String name, Boolean status) {
   // Constructor and methods (if any)
 }
 
-record Employee(Long id, String name, LocalDate dateOfBirth, Boolean status, Department department) {
+record Employee(Long id, String name, LocalDate dateOfBirth, Boolean status,
+                Department department) {
   // Constructor and methods (if any)
 }