thread safe singleton class

[bjit babu]

what is the best possible way to make a singleton class thread safe.

[Pat Farrell]

Don't use a singleton class. Singletons are evil.

They can be thread safe if you make the data in them immutable.

[Alexey Dubinin]

The simplest way is to use enum:

public enum MySuperSingleton{
    INSTANCE;
    
    public void doCoolThings(){
        //...
    }
}

But remember that methods of this class should be thread safe.

[Stephan van Hulst]

Singletons or enums aare no different from other classes when it comes to thread-safety.

Either synchronize them properly, or even better, make them immutable.