Singleton design pattern of the lazy formula (thread-safe)

package com.waibizi.demo03;
/**
 * Pros: effect played lazy loading, but can only be used in single-threaded case
 * Cons: If it is a multi-threaded, a thread has entered if (instance == null) but have not had time to instantiate, this time another thread has entered if (instance == null), then it will generate more than instances
 * You can not use this lazy man's load in the case of multi-threaded
 * @Author crooked nose
 *
 */
@SuppressWarnings("all")
public class Singleton_Pattern {


    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Singleton test = Singleton.getInstance();
        Singleton test1 = Singleton.getInstance();
        System.out.println(test.hashCode());
        System.out.println(test1.hashCode());

    }

}
@SuppressWarnings("all")
class Singleton{
    private static Singleton instance;
    private Singleton() {
        
    }
    
    // provides a public static method, when this method is used only to create instance
     // i.e. lazy loading of formula 
    public  static the Singleton the getInstance () {
         IF (instance == null ) {
            System.out.println ( "I only initialized this time oh" );
            instance=new Singleton();
        }
        return instance;
    }
}