Usage of try-with-resources

pom file cleanup

pom.xml

@@ -24,9 +24,8 @@
   <version>1.0.0-SNAPSHOT</version>
   
   <properties>
-    <java.version>21</java.version>
     <maven.compiler.parameters>true</maven.compiler.parameters>
-    <maven.compiler.release>${java.version}</maven.compiler.release>
+    <maven.compiler.release>21</maven.compiler.release>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
   </properties>
@@ -100,11 +99,11 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-compiler-plugin</artifactId>
-          <version>3.8.1</version>
+          <version>3.12.1</version>
           <configuration>
+            <enablePreview>true</enablePreview>
             <parameters>true</parameters>
             <compilerArgs>
-              <compilerArg>--enable-preview</compilerArg>
               <compilerArg>--add-modules</compilerArg>
               <compilerArg>java.base,jdk.incubator.vector</compilerArg>
             </compilerArgs>
@@ -118,17 +117,17 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-deploy-plugin</artifactId>
-          <version>3.0.0-M1</version>
+          <version>3.1.1</version>
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-enforcer-plugin</artifactId>
-          <version>3.0.0-M3</version>
+          <version>3.3.0</version>
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-install-plugin</artifactId>
-          <version>3.0.0-M1</version>
+          <version>3.1.1</version>
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
@@ -143,12 +142,17 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-site-plugin</artifactId>
-          <version>3.9.1</version>
+          <version>3.12.1</version>
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-surefire-plugin</artifactId>
-          <version>3.0.0-M5</version>
+          <version>3.2.3</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-wrapper-plugin</artifactId>
+          <version>3.2.0</version>
         </plugin>
       </plugins>
     </pluginManagement>
@@ -223,7 +227,7 @@
                 <configuration>
                   <rules>
                     <requireJavaVersion>
-                      <version>[${java.version},)</version>
+                      <version>${maven.compiler.release}</version>
                     </requireJavaVersion>
                     <requirePluginVersions>
                        <banLatest>true</banLatest>

src/main/java/dev/morling/onebrc/CreateMeasurements.java

@@ -16,16 +16,14 @@
 package dev.morling.onebrc;
 
 import java.io.BufferedWriter;
-import java.io.File;
+import java.nio.file.Files;
-import java.io.FileOutputStream;
+import java.nio.file.Path;
-import java.io.OutputStreamWriter;
-import java.util.Arrays;
 import java.util.List;
 import java.util.concurrent.ThreadLocalRandom;
 
 public class CreateMeasurements {
 
-    private static final String FILE = "./measurements.txt";
+    private static final Path MEASUREMENT_FILE = Path.of("./measurements.txt");
 
     private record WeatherStation(String id, double meanTemperature) {
         double measurement() {
@@ -76,7 +74,7 @@ public class CreateMeasurements {
         //         )
         // ) TO 'output.csv' (HEADER, DELIMITER ',');
         // @formatter:on
-        List<WeatherStation> stations = Arrays.asList(
+        List<WeatherStation> stations = List.of(
                 new WeatherStation("Abha", 18.0),
                 new WeatherStation("Abidjan", 26.0),
                 new WeatherStation("Abéché", 29.4),
@@ -491,20 +489,17 @@ public class CreateMeasurements {
                 new WeatherStation("Zanzibar City", 26.0),
                 new WeatherStation("Zürich", 9.3));
 
-        File measurements = new File(FILE);
+        try (BufferedWriter bw = Files.newBufferedWriter(MEASUREMENT_FILE)) {
-        try (FileOutputStream fos = new FileOutputStream(measurements); BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fos));) {
             for (int i = 0; i < size; i++) {
                 if (i > 0 && i % 50_000_000 == 0) {
-                    System.out.println("Wrote %,d measurements in %s ms".formatted(i, System.currentTimeMillis() - start));
+                    System.out.printf("Wrote %,d measurements in %s ms%n", i, System.currentTimeMillis() - start);
                 }
                 WeatherStation station = stations.get(ThreadLocalRandom.current().nextInt(stations.size()));
                 bw.write(station.id());
                 bw.write(";" + station.measurement());
                 bw.newLine();
             }
-            bw.flush();
-
-            System.out.println("Created file with %,d measurements in %s ms".formatted(size, System.currentTimeMillis() - start));
         }
+        System.out.printf("Created file with %,d measurements in %s ms%n", size, System.currentTimeMillis() - start);
     }
 }