Factory Method in JAVA

Factory Methods are static methods that return a same (native) class object.

Example:

• java.lang.Runtime #getRuntime()
• java.text.DateFormat # getInstance ()
• java.util.Calendar #getInstance()
• java.util.Collections #synchronizedCollection()

Sample Factory Class:

Below is the sample Factory method from Example of Singleton Design Pattern.

public class Singleton{

    private static Singleton objSingleton;

    private Singleton(){

    }

    

    // Factory Method

    public  static Singleton getInstance(){

        if(objSingleton == null)

            objSingleton = new Singleton();

        return objSingleton;

    }

}