simple program using Abstract Class & Abstract functions (Java) (213)

package com.company;
abstract class parent1
{
    public parent1(){
        System.out.println("i ma a constructor of a parent class");
    }
   abstract public void test();
}
class child2 extends parent1
{
 public void test()
 {
     System.out.println("this is the function of child2");
 }
}
abstract class child3 extends parent1
{
    public void child3()
    {
        System.out.println("i am a constructor of a child3 class");
    }
}
public class Program50 {
    public static void main(String[] args) {
       // child3 obj2=new child3(); wrong we cannot make the object of abstruct class
        child2 obj=new child2();
        obj.test();
        }
}