README.md

Singleton

Requirement

• Create an object on request
• Thread safe
• Small overhead on synchronization

Notes

• Block synchronization
• Volatile keyword for happens-before semantics
• Lazy initialization
• Double-Checked Locking

Code

    public static Singleton getInstance() {
        if (singleton == null) {
            synchronized (Singleton.class) {
                if (singleton == null) {
                    singleton = new Singleton();
                    System.out.println("Singleton object created");
                }
            }
        }
        return singleton;
    }

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