Java 9 Concurrency Cookbook - Second Edition

How to do it...

Follow these steps to implement the example:

1. Create a class named DBConnectionOK:

        public class DBConnectionOK {

2. Declare a private constructor. Write the name of the thread that executes it:

        private DBConnectionOK() {           System.out.printf("%s: Connection created.\n",                            Thread.currentThread().getName());         }

3. Declare a private static class named LazyDBConnectionOK. It has a private static final DBConnectionOK instance named INSTANCE:

        private static class LazyDBConnection {           private static final DBConnectionOK INSTANCE = new                                                   DBConnectionOK();         }

4. Implement the getConnection() method. It doesn't receive any parameter and returns a DBConnectionOK object. It returns the INSTANCE object:

 public static DBConnectionOK getConnection() ...