Describe how you should write thread-safe singleton with lazy initialization.

Question

Misha Mosin · Accepted Answer

public class Singleton {
    private static volatile Singleton instance;

public static Singleton getInstance() {
        Singleton localInstance = instance;
        if (localInstance == null) {
            synchronized (Singleton.class) {
                localInstance = instance;
                if (localInstance == null) {
                    instance = localInstance = new Singleton();
                }
            }
        }
        return localInstance;
    }
}

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