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Private constructor in java example

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instanceof java

Posts: 576
Nickname: instanceof
Registered: Jan, 2015

instanceof java is a java related one.
Private constructor in java example Posted: Jul 9, 2016 10:35 AM
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Constructor in java:

  • Constructor is used to initialize class variables.
  • Constructor will be executed once per object and whenever object is created constructor will be called.




Private Constructor in java:

  • We can make constructor private, public , protected and default.
  • If we define a constructor as private means we are restricting a class to create object  outside of the class.
  • A class having private constructor does not allow user to create object outside.
  • In singleton Design pattern we will use private constructor to restrict object creation


  1. package inheritanceInterviewPrograms;
  2.  
  3. public class A {
  4.   
  5.   private A(){
  6.        
  7.        
  8.    }
  9.  
  10. public static void main(String args[]){ 
  11.    
  12.       A s= new A();
  13.   }
  14.  
  15. }

  1. package inheritanceInterviewPrograms;
  2. //  www.instanceofjava.com
  3.  
  4. public class B {
  5.     
  6. public static void main(String [] args){
  7.      
  8.     A obj= new A();// Compile time error
  9.    
  10.  
  11. }
  12. }


private Constructor example

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