» » Differences between Default constructor and no argument constructor in java

Differences between default constructor and no argument constructor


Default Constructor in java:

  • When we write a class without any constructor then at compilation time java compiler creates a default constructor in our class.
  • The accessibility modifier of the default constructor is same as accessibility modifier of class.
  • The allowed accessibility modifier are public and default.
  • Default constructor added by java compiler this constructor does not have anything except super(); call.





  1. package constructor;
  2. public class A {
  3.   
  4.  
  5. }


  1. package constructor;
  2. public class A {
  3.  
  4.     A(){
  5.         
  6.         super();
  7.  
  8.     }
  9.  
  10. }



  • If our class have any constructor then java compiler does not create default constructor

No-argument Constructor in java:

  • As a developer we can create our own constructor with no arguments is known as no-argument constructor.
  • It can have all four accessibility modifiers as it is defined by developer.
  • So allowed accessibility modifiers are public, private, protected and default
  • It can have logic including super call.


  1. package constructor;
  2. public class A {
  3.  
  4.     A(){
  5.         
  6.   super();
  7.   System.out.println("no -argument constructor");

  8.     }
  9.  
  10. }

  • The common point between default and no-argument constructor 
  • Both does not have any arguments.
  • And one more point we need to remember that in no-argument constructor also by default first statement will be super() call which is added by java compiler if it does not have.

Instance Of Java

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