Summary

Update the java.util.concurrent.ThreadLocalRandom to be a final class.

Problem

The ThreadLocalRandom class has a sole private constructor:

private ThreadLocalRandom() {
...

So in essence, the ThreadLocalRandom class cannot have any sub class. Marking the ThreadLocalRandom as final would thus convey it more clearly that the class cannot be extended.

Solution

Update the class to final.

Specification

The proposed change looks as follows:

--- a/src/java.base/share/classes/java/util/concurrent/ThreadLocalRandom.java
+++ b/src/java.base/share/classes/java/util/concurrent/ThreadLocalRandom.java
@@ -93,7 +93,7 @@ import jdk.internal.misc.VM;
...
-public class ThreadLocalRandom extends Random {
+public final class ThreadLocalRandom extends Random {