ConstructorDemo.java

class emp
{
  int empid;  // instance variables
  String name; //instance variables
  // non parameterised constructor
  emp()
  {
    empid = 10;
    name = "abc";
    //System.out.println("constructor invoked ");
  }
  emp(int ta, String tb)
  {
    empid = ta;
    name = tb;
  }
  emp(int ta)
  {
    empid = ta;
    name = "aaa";
  }
  public void show() // instance method
  {
    System.out.println(empid + "  "+ name);
  }

} // end of class emp

public class ConstructorDemo {
  public static void main(String[] args) {
    emp obj = new emp();
    obj.show();
    emp obj2 = new emp(3,"hhh");
    obj2.show();
    emp obj3 = new emp(4);
    obj3.show();
    // new keyword is responsible to create object
    // purpose of the constructor to perform
    // initialization of the object

  }

}

// constructor
// overloading

//1) by providing different no of arguments
//        emp(int)
//        emp(int, int )
//        emp(int, int , int )
//2) by providing different types of arguments
//        emp(String)
//        emp(int)
//        emp(int , String)
//        emp(String, int)
//
//
//emp()
//{
//
//}
//emp(int)
//{
//
//}
//emp(String)
//{
//
//}
//emp(int, String )
//{
//
//}