Home > Uncategorized > Thread-safe singleton

Thread-safe singleton

It seems that the better way to implement a thread safe singleton in java is using an holder that solves the lazy initialization too:

public class ConfigurationRegistry
private ConfigurationRegistry()

public static ConfigurationRegistry getInstance()
//Holder.instance is lazy initialized the first time access...
return Holder.instance;

private static class Holder
//single line thread safe
static final ConfigurationRegistry instance = new ConfigurationRegistry();

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