Merge pull request #9660 from martinvw/feature/BAEL-4213

[BAEL-4213] Why are local variables thread safe

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();
+    }
+}

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);
+    }
+}