Singleton design pattern in Java

Singleton design pattern

package swain.singleton.javainterviewhub.blogspot.in.designpattern.singleton;

public class SingleObject {

       public static SingleObject singleton = new SingleObject();

       private SingleObject() {

       }

       public static SingleObject getInstance() {

              return singleton;

       }

      

       public void showMessage(){

              System.out.println("hello world");

       }

}

package swain.singleton.javainterviewhub.blogspot.in.designpattern.singleton;

public class SingletonPatternDemo {

       public static void main(String[] args) {

              SingleObject singleObject=SingleObject.getInstance();

              singleObject.showMessage();

       }

}

There are three cases singleton class fail

1) Serialization :We can create multiple instance by searialization case.

2) Multi threading :Singleton class not thread safe

3) Class loader: We can create multiple instance with different class loader