Copying values without constructor

We all already seen about constructor ... now ,

We can copy the values of one object into another by assigning the objects values to another object. In this case, there is no need to create the constructor.

ex:
class Student7{  
    int id;  
    String name;  
    Student7(int i,String n){  
    id = i;  
    name = n;  
    }  
    Student7(){}  
    void display(){System.out.println(id+" "+name);}  
   
    public static void main(String args[]){  
    Student7 s1 = new Student7(1,"AAA");  
    Student7 s2 = new Student7();  
    s2.id=s1.id;  
    s2.name=s1.name;  
    s1.display();  
    s2.display();  
   }  

}