BASE-4618: Create new module, local variable example

core-java-modules/core-java-lang-4/README.md

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+## Core Java Lang (Part 4)
+
+This module contains articles about core features in the Java language
+
+- TODO

core-java-modules/core-java-lang-4/pom.xml

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+<?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>
+    <artifactId>core-java-lang-4</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-lang-4</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>core-java-lang-4</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+    <properties>
+        <assertj.version>3.19.0</assertj.version>
+    </properties>
+      
+</project>

core-java-modules/core-java-lang-4/src/main/java/com/baeldung/finalkeyword/LocalVariableFinal.java

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+package com.baeldung.finalkeyword;
+
+public class LocalVariableFinal {
+
+    public static void main(String[] args) {
+        for (int i = 0; i < 1500; i++) {
+            long startTime = System.nanoTime();
+            String result = concatStrings();
+            long totalTime = System.nanoTime() - startTime;
+            if (i >= 500) {
+                System.out.println(totalTime);
+            }
+        }
+    }
+
+    private static String concatStrings() {
+        final String x = "x";
+        final String y = "y";
+        return x + y;
+    }
+
+}

core-java-modules/core-java-lang-4/src/main/java/com/baeldung/finalkeyword/LocalVariableNonFinal.java

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+package com.baeldung.finalkeyword;
+
+public class LocalVariableNonFinal {
+
+    public static void main(String[] args) {
+        for (int i = 0; i < 1500; i++) {
+            long startTime = System.nanoTime();
+            String result = concatStrings();
+            long totalTime = System.nanoTime() - startTime;
+            if (i >= 500) {
+                System.out.println(totalTime);
+            }
+        }
+    }
+
+    private static String concatStrings() {
+        String x = "x";
+        String y = "y";
+        return x + y;
+    }
+
+}