Differences between Default constructor and no argument constructor in java

Core java Interview Questions

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.  
11. }

• 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.

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Differences between Default constructor and no argument constructor in java

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