Singleton Class In Java

A singleton class is a class which has one object at a time. In other words, a class having one and only one instance at a time is known as a singleton class.

This can be achieved by following :

• Make the method which returns the object as static. In our case, the method is getInstance().
• Make the constructor as private.
• Check for the instance of the class in the static method. If the instance is not there then create the instance using new operator. Otherwise, return the instance.

Example :

class MySingleton{          private static MySingleton ms=null;          public String s;          // create a private constructor                   private MySingleton(){                  s="Singleton from Play Java";               }          /* create a static method to return the instance               of the class. If the instance is not present          then create one */          public static MySingleton getInstance(){                if(ms==null) ms=new MySingleton();                return ms;          }    }

Uses Cases:

• Singleton class are mostly used where the single data is required to create on the first call and retains its instance until the closure of application.
• Used for logging, caching, configuration settings, thread pools, etc.

Refer the video tutorial :

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