This directory contains a number of separate examples. These have no external dependencies, but may require multiple classes from within the directory. These examples should be used with Java 11+.

These examples may be loaded and run in an IDE at the Ch06 level. You may need to set the project JDK version.

• accounts/Main.java - Example of a concurrent account transfer system. Uses other classes from in the accounts directory.
• CDLExamples.java - Example usage of the CountDownLatch class
• CFExamples.java - Example usage of the CompletableFuture class
• COWExamples.java - Exampe usage of the CopyOnWriteArrayList class
• ExecutorExamples.java - Example usage of the Executors.newSingleThreadExecutor factory method
• FutureExamples.java - Example usage of the Future<> interface
• RWLockExamples.java - Example usage of the ReentrantReadWriteLock class

Several examples explore issues around concurrent access to Map implementations

• BadMapExamples.java - Example of bad results from unsafe concurrent access to HashMap.
• Dictionary.java - A basic, non-concurrent implementation of the Map interface.
• ImmutableDictionary.java - An immutable wrapper around our Dictionary class.
• SynchronizedDictionary.java - A naively synchronized wrapper around our Dictionary class.

To compile and run these samples at the command-line, do the following:

cd Ch06/ch06
javac *.java
java -cp .. ch06.BadMapExamples

cd Ch06/ch06/accounts
javac *.java
java cp ../.. ch06.accounts.Main