From da6ee4cc12d5fc0f21efaf02a66a16763aa27c1f Mon Sep 17 00:00:00 2001
From: Martin van Wingerden <martin@martinvw.nl>
Date: Tue, 7 Jul 2020 14:57:47 +0200
Subject: [PATCH] [BAEL-4213] Why are local variables thread safe

Added two small example for article about thread-safety for local variables.
---
 .../localvariables/LocalAndLambda.java        | 10 ++++++++++
 .../localvariables/LocalVariables.java        | 20 +++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 core-java-modules/core-java-concurrency-basic-2/src/main/java/com/baeldung/concurrent/localvariables/LocalAndLambda.java
 create mode 100644 core-java-modules/core-java-concurrency-basic-2/src/main/java/com/baeldung/concurrent/localvariables/LocalVariables.java

diff --git a/core-java-modules/core-java-concurrency-basic-2/src/main/java/com/baeldung/concurrent/localvariables/LocalAndLambda.java b/core-java-modules/core-java-concurrency-basic-2/src/main/java/com/baeldung/concurrent/localvariables/LocalAndLambda.java
new file mode 100644
index 0000000000..d8e0815797
--- /dev/null
+++ b/core-java-modules/core-java-concurrency-basic-2/src/main/java/com/baeldung/concurrent/localvariables/LocalAndLambda.java
@@ -0,0 +1,10 @@
+package com.baeldung.concurrent.localvariables;
+
+public class LocalAndLambda {
+    public static void main(String... args) {
+        String text = "";
+        // Un-commenting the next line will break compilation, because text is no longer effectively final
+        // text = "675";
+        new Thread(() -> System.out.println(text)).start();
+    }
+}
diff --git a/core-java-modules/core-java-concurrency-basic-2/src/main/java/com/baeldung/concurrent/localvariables/LocalVariables.java b/core-java-modules/core-java-concurrency-basic-2/src/main/java/com/baeldung/concurrent/localvariables/LocalVariables.java
new file mode 100644
index 0000000000..39cae8da81
--- /dev/null
+++ b/core-java-modules/core-java-concurrency-basic-2/src/main/java/com/baeldung/concurrent/localvariables/LocalVariables.java
@@ -0,0 +1,20 @@
+package com.baeldung.concurrent.localvariables;
+
+import java.security.SecureRandom;
+
+public class LocalVariables implements Runnable {
+    private int field;
+
+    public static void main(String... args) {
+        LocalVariables target = new LocalVariables();
+        new Thread(target).start();
+        new Thread(target).start();
+    }
+
+    @Override
+    public void run() {
+        field = new SecureRandom().nextInt();
+        int local = new SecureRandom().nextInt();
+        System.out.println(field + " - " + local);
+    }
+}