Create a Singleton Object : Access Control « Class Definition « Java Tutorial

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Java Tutorial » Class Definition » Access Control

5. 25. 15. Create a Singleton Object


class MySingleton {

  // the static singleton object

  private static MySingleton theObject;



  private MySingleton() {

  }



  public static MySingleton createMySingleton() {



    if (theObject == null)

      theObject = new MySingleton();



    return theObject;

  }

}



public class Main {

  public static void main(String[] args) {

    MySingleton ms1 = MySingleton.createMySingleton();



    MySingleton ms2 = MySingleton.createMySingleton();



    System.out.println(ms1 == ms2);

  }

}

5. 25. Access Control
	5. 25. 1.	Access Control: four access control modifiers
	5. 25. 2.	Class Access Control Modifiers
	5. 25. 3.	Using Access Attributes
	5. 25. 4.	Class Member Access Matrix
	5. 25. 5.	Specifying Access Attributes
	5. 25. 6.	The public Book class
	5. 25. 7.	Default access level
	5. 25. 8.	Class Member Access Control Modifiers
	5. 25. 9.	Composition with public objects
	5. 25. 10.	The protected keyword
	5. 25. 11.	Private Override
	5. 25. 12.	Understand the effects of public and private access
	5. 25. 13.	In a class hierarchy, private members remain private to their class.
	5. 25. 14.	A Superclass Variable Can Reference a Subclass Object
	5. 25. 15.	Create a Singleton Object

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