Default Constructor

Anonymous User 1153 20 Jun 2018

What Is A Default Constructor ?

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1 Answers

Prakash nidhi Verma 20 Jun 2018

Default Constructor :

If you are going to instantiate an array of objects of the class, the class must have a default constructor. If no user-defined constructor exists for a class A and one is needed, the compiler implicitly declares a default parameter less constructor A::A() .

Syntax:

class X { 
public:

  X();                       // Default constructor with no arguments

  X(int = 0);                // Default constructor with one default argument

  X(int, int , int = 0);     // Constructor

};

Ex:

// Main.java 
class Test {
   int i;
   Test t;
   boolean b;
   byte bt;
   float ft;
}
public class Main {
    public static void main(String args[]) {
      Test t = new Test(); // default constructor is called.
      System.out.println(t.i);
      System.out.println(t.t);
      System.out.println(t.b);
      System.out.println(t.bt);
      System.out.println(t.ft);
    }
}

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Default Constructor

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