inheritance - How to populate the fields of a subclass based on a superclass in Java? -

i have base summary class below:

public class summary{     private string name;     private string status;     private string id;  // getters , setters } 

i extended class customer summary:

public class customersummary extends summary{     private string lastlogin;     private string address;  // getters , setters } 

now calling rest endpoint maps response summary object. need set lastlogin , address calling rest endpoint , return combined data customersummary object.

summary summary = restclient.getstatus("1234"); customersummary customer = new customersummary() 

how set inherited fields of customer object same summary object? can't cast since have down cast , run classcastexception.

i may have 10s of fields calling setters of customer object fileds of summary object result in lot of duplicate code. there smarter way handle this?

you make "copy-constructor"

protected summary(summary template){    this.name = template.name;    // .... } 

and call subclasses

customersummary(summary template){     super(template); } 

so can do

summary summary = restclient.getstatus("1234"); customersummary customer = new customersummary(summary);