ThreadSafeSingleton

public class ThreadSafeSingleton {

    private static ThreadSafeSingleton mThreadSafeSigleton;
    
    private ThreadSafeSingleton(){}
    
    public static synchronized ThreadSafeSingleton getThreadSafeSingleton(){
        if(mThreadSafeSigleton == null){
            mThreadSafeSigleton = new ThreadSafeSingleton();
        }
        return mThreadSafeSigleton;
    }
}